These data are summarized from the Ecological Checklist of the Missouri Flora (Ladd and Thomas 2015). Coefficients of conservatism (C value) range from 0 (will grow anywhere, including highly disturbed habitats or non-native) to 10 (will only be found in very high-quality, undisturbed habitat). A brief article about coefficients of conservatism is also available online. Coefficients of wetness (W value) range from -5 (indicating an obligate wetland species) to 5 (indicating a dry, upland species).
| Taxon | Family | Common Name | Code | Native? | C | W | Physiognomy | Duration |
|---|---|---|---|---|---|---|---|---|
| Abutilon theophrasti | Malvaceae | Velvetleaf | ABUTHE | non-native | 0 | 3 | forb | annual |
| Acaciella angustissima | Fabaceae | Prairie Acacia | ACAANG | native | 10 | 5 | shrub | perennial |
| Acalypha deamii | Euphorbiaceae | Large-Seeded Mercury | ACADEA | native | 7 | 3 | forb | annual |
| Acalypha gracilens | Euphorbiaceae | Slender Mercury | ACAGRA | native | 3 | 5 | forb | annual |
| Acalypha monococca | Euphorbiaceae | One-Seeded Slender Mercury | ACAMON | native | 3 | 5 | forb | annual |
| Acalypha ostryifolia | Euphorbiaceae | Three-Seeded Mercury | ACAOST | native | 1 | 5 | forb | annual |
| Acalypha rhomboidea | Euphorbiaceae | Rhombic Copperleaf | ACARHO | native | 1 | 3 | forb | annual |
| Acalypha virginica | Euphorbiaceae | Virginia Mercury | ACAVIR | native | 2 | 3 | forb | annual |
| Acer ginnala | Sapindaceae | Amur Maple | ACEGIN | non-native | 0 | 5 | tree | perennial |
| Acer negundo | Sapindaceae | Box Elder | ACENEG | native | 1 | 0 | tree | perennial |
| Acer rubrum var. drummondii | Sapindaceae | Drummonds Maple | ACERUD | native | 8 | -5 | tree | perennial |
| Acer rubrum var. rubrum | Sapindaceae | Red Maple | ACERUR | native | 5 | 0 | tree | perennial |
| Acer rubrum var. trilobum | Sapindaceae | Trident Maple | ACERUT | native | 6 | 0 | tree | perennial |
| Acer saccharinum | Sapindaceae | Silver Maple | ACESIL | native | 2 | -3 | tree | perennial |
| Acer saccharum subsp. floridanum | Sapindaceae | Southern Sugar Maple | ACESUF | native | 6 | 3 | tree | perennial |
| Acer saccharum subsp. nigrum | Sapindaceae | Black Maple | ACESUN | native | 5 | 3 | tree | perennial |
| Acer saccharum subsp. saccharum | Sapindaceae | Sugar Maple | ACESUG | native | 5 | 3 | tree | perennial |
| Acer saccharum subsp. schneckii | Sapindaceae | Velvety Sugar Maple | ACESUC | native | 5 | 3 | tree | perennial |
| Achillea millefolium | Asteraceae | Yarrow | ACHMIL | native | 1 | 3 | forb | perennial |
| Achillea ptarmica | Asteraceae | Sneezewort | ACHPTA | non-native | 0 | 3 | forb | perennial |
| Achyranthes japonica | Amaranthaceae | Japanese Chaff Flower | ACHJAP | non-native | 0 | 5 | forb | perennial |
| Acmella oppositifolia | Asteraceae | Spilanthes | ACMOPP | native | 8 | -3 | forb | perennial |
| Acmispon americanus | Fabaceae | Clements Prairie Trefoil | ACMAME | native | 6 | 3 | forb | annual |
| Aconitum uncinatum | Ranunculaceae | Southern Monkshood | ACOUNC | native | 10 | 0 | forb | perennial |
| Acorus calamus | Acoraceae | Sweet Flag | ACOCAL | non-native | 0 | -5 | forb | perennial |
| Actaea pachypoda | Ranunculaceae | White Baneberry | ACTPAC | native | 8 | 3 | forb | perennial |
| Actaea racemosa | Ranunculaceae | Black Cohosh | ACTRAC | native | 7 | 5 | forb | perennial |
| Actinidia chinensis var. deliciosa | Actinidiaceae | Dwarf Kiwi | ACTCHI | non-native | 0 | 5 | vine | perennial |
| Adiantum capillus-veneris | Pteridaceae | Venus-Hair Fern | ADICAP | native | 10 | 3 | fern | perennial |
| Adiantum pedatum | Pteridaceae | Maidenhair Fern | ADIPED | native | 6 | 3 | fern | perennial |
| Adonis annua | Ranunculaceae | Blood Drops | ADOANN | non-native | 0 | 5 | forb | annual |
| Aegilops cylindrica | Poaceae | Goat Grass | AEGCYL | non-native | 0 | 5 | grass | annual |
| Aeschynomene indica | Fabaceae | Indian Jointvetch | AESIND | non-native | 0 | -3 | forb | annual |
| Aeschynomene rudis | Fabaceae | Zigzag Jointvetch | AESRUD | non-native | 0 | 5 | forb | perennial |
| Aesculus glabra var. arguta | Sapindaceae | Ohio Buckeye | AESGLT | native | 5 | 3 | tree | perennial |
| Aesculus glabra var. glabra | Sapindaceae | Ohio Buckeye | AESGLG | native | 5 | 3 | tree | perennial |
| Aesculus pavia | Sapindaceae | Red Buckeye | AESPAV | native | 7 | 3 | tree | perennial |
| Agalinis aspera | Orobanchaceae | Rough False Foxglove | AGAASP | native | 10 | 3 | forb | annual |
| Agalinis auriculata | Orobanchaceae | Eared False Foxglove | AGAAUR | native | 10 | 5 | forb | annual |
| Agalinis fasciculata | Orobanchaceae | Fascicled Agalinis | AGAFAS | native | 7 | 0 | forb | annual |
| Agalinis gattingeri | Orobanchaceae | Round-Stemmed False Foxglove | AGAGAT | native | 7 | 5 | forb | annual |
| Agalinis heterophylla | Orobanchaceae | Prairie False Foxglove | AGAHET | native | 10 | 3 | forb | annual |
| Agalinis purpurea | Orobanchaceae | Purple False Foxglove | AGAPUR | native | 10 | -3 | forb | annual |
| Agalinis skinneriana | Orobanchaceae | Pale False Foxglove | AGASKI | native | 7 | 3 | forb | annual |
| Agalinis tenuifolia | Orobanchaceae | Slender False Foxglove | AGATEN | native | 4 | 0 | forb | annual |
| Agalinis viridis | Orobanchaceae | Green False Foxglove | AGAVIR | native | 10 | 5 | forb | annual |
| Agastache nepetoides | Lamiaceae | Yellow Giant Hyssop | AGANEP | native | 4 | 3 | forb | perennial |
| Agastache scrophulariifolia | Lamiaceae | Purple Giant Hyssop | AGASCR | native | 9 | 5 | forb | perennial |
| Ageratina altissima | Asteraceae | White Snakeroot | AGEALT | native | 2 | 3 | forb | perennial |
| Ageratum conyzoides | Asteraceae | Ageratum | AGECON | non-native | 0 | 3 | forb | annual |
| Agrimonia gryposepala | Rosaceae | Tall Agrimony | AGRGRY | native | 9 | 3 | forb | perennial |
| Agrimonia parviflora | Rosaceae | Swamp Agrimony | AGRPAR | native | 5 | -3 | forb | perennial |
| Agrimonia pubescens | Rosaceae | Soft Agrimony | AGRPUB | native | 4 | 5 | forb | perennial |
| Agrimonia rostellata | Rosaceae | Beaked Agrimony | AGRROS | native | 4 | 3 | forb | perennial |
| Agropyron cristatum | Poaceae | Crested Wheat Grass | AGRCRI | non-native | 0 | 5 | grass | perennial |
| Agrostemma githago | Caryophyllaceae | Corn Cockle | AGRGIT | non-native | 0 | 5 | forb | annual |
| Agrostis capillaris | Poaceae | Rhode Island Bent | AGRCAP | non-native | 0 | 0 | grass | perennial |
| Agrostis elliottiana | Poaceae | Awned Bent Grass | AGRELL | native | 3 | 3 | grass | annual |
| Agrostis gigantea | Poaceae | Redtop | AGRGIG | non-native | 0 | -3 | grass | perennial |
| Agrostis hyemalis | Poaceae | Tickle Grass | AGRHYE | native | 3 | 0 | grass | perennial |
| Agrostis perennans var. aestivalis | Poaceae | Lowland Bent Grass | AGRPEA | native | 8 | -3 | grass | perennial |
| Agrostis perennans var. perennans | Poaceae | Upland Bent Grass | AGRPEP | native | 3 | 3 | grass | perennial |
| Agrostis stolonifera | Poaceae | Creeping Bent Grass | AGRSTO | non-native | 0 | -3 | grass | perennial |
| Ailanthus altissima | Simaroubaceae | Tree Of Heaven | AILALT | non-native | 0 | 5 | tree | perennial |
| Aira caryophyllea | Poaceae | Silver Hair Grass | AIRCAR | non-native | 0 | 3 | grass | annual |
| Aira elegans | Poaceae | Hair Grass | AIRELE | non-native | 0 | 5 | grass | annual |
| Ajuga reptans | Lamiaceae | Common Bugle | AJUREP | non-native | 0 | 5 | forb | perennial |
| Akebia quinata | Lardizabalaceae | Chocolate Vine | AKEQUI | non-native | 0 | 5 | vine | perennial |
| Albizia julibrissin | Fabaceae | Mimosa | ALBJUL | non-native | 0 | 5 | tree | perennial |
| Alcea rosea | Malvaceae | Hollyhock | ALCROS | non-native | 0 | 5 | forb | perennial |
| Alisma gramineum | Alismataceae | Grass-Leaved Water Plantain | ALIGRA | native | 8 | -5 | forb | perennial |
| Alisma subcordatum | Alismataceae | Common Water Plantain | ALISUB | native | 3 | -5 | forb | perennial |
| Alisma triviale | Alismataceae | Large-Flowered Water Plantain | ALITRI | native | 5 | -5 | forb | perennial |
| Alliaria petiolata | Brassicaceae | Garlic Mustard | ALLPET | non-native | 0 | 3 | forb | biennial |
| Allium burdickii | Liliaceae | Ramps | ALLBUR | native | 9 | 3 | forb | perennial |
| Allium canadense | Liliaceae | Wild Garlic | ALLCAN | native | 2 | 3 | forb | perennial |
| Allium cepa | Liliaceae | Wild Onion | ALLCEP | non-native | 0 | 5 | forb | perennial |
| Allium cernuum | Liliaceae | Nodding Wild Onion | ALLCER | native | 8 | 3 | forb | perennial |
| Allium mutabile | Liliaceae | Glade Onion | ALLMUT | native | 7 | 5 | forb | perennial |
| Allium sativum | Liliaceae | Garlic | ALLSAT | non-native | 0 | 5 | forb | perennial |
| Allium stellatum | Liliaceae | Prairie Onion | ALLSTE | native | 6 | 5 | forb | perennial |
| Allium tricoccum | Liliaceae | Wild Leek | ALLTRI | native | 8 | 3 | forb | perennial |
| Allium tuberosum | Liliaceae | Chinese Chives | ALLTUB | non-native | 0 | 5 | forb | perennial |
| Allium vineale | Liliaceae | Field Garlic | ALLVIN | non-native | 0 | 3 | forb | perennial |
| Alnus glutinosa | Betulaceae | European Alder | ALNGLU | non-native | 0 | -3 | tree | perennial |
| Alnus serrulata | Betulaceae | Smooth Alder | ALNSER | native | 7 | -5 | shrub | perennial |
| Alopecurus aequalis | Poaceae | Tufted Foxtail | ALOAEQ | native | 9 | -5 | grass | perennial |
| Alopecurus carolinianus | Poaceae | Annual Foxtail | ALOCAR | native | 0 | -3 | grass | annual |
| Alopecurus pratensis | Poaceae | Meadow Foxtail | ALOPRA | non-native | 0 | -3 | grass | perennial |
| Alyssum alyssoides | Brassicaceae | Pale Alyssum | ALYALY | non-native | 0 | 5 | forb | annual |
| Alyssum desertorum | Brassicaceae | Alyssum | ALYDES | non-native | 0 | 5 | forb | annual |
| Amaranthus albus | Amaranthaceae | Tumbleweed | AMAALB | native | 0 | 3 | forb | annual |
| Amaranthus arenicola | Amaranthaceae | Torreys Amaranth | AMAARE | non-native | 0 | 3 | forb | annual |
| Amaranthus blitoides | Amaranthaceae | Creeping Amaranth | AMABLS | non-native | 0 | 3 | forb | annual |
| Amaranthus blitum var. emarginatus | Amaranthaceae | Salad Amaranth | AMABLM | non-native | 0 | 3 | forb | annual |
| Amaranthus caudatus | Amaranthaceae | Purple Amaranth | AMACAU | non-native | 0 | 5 | forb | annual |
| Amaranthus cruentus | Amaranthaceae | Red Amaranth | AMACRU | non-native | 0 | 5 | forb | annual |
| Amaranthus hybridus | Amaranthaceae | Green Amaranth | AMAHYB | native | 0 | 5 | forb | annual |
| Amaranthus hypochondriacus | Amaranthaceae | Princes Feather | AMAHYP | non-native | 0 | 5 | forb | annual |
| Amaranthus palmeri | Amaranthaceae | Careless Weed | AMAPAL | non-native | 0 | 3 | forb | annual |
| Amaranthus powellii | Amaranthaceae | Tall Amaranth | AMAPOW | non-native | 0 | 5 | forb | annual |
| Amaranthus retroflexus | Amaranthaceae | Rough Amaranth | AMARET | non-native | 0 | 3 | forb | annual |
| Amaranthus spinosus | Amaranthaceae | Thorny Amaranth | AMASPI | non-native | 0 | 3 | forb | annual |
| Amaranthus tricolor | Amaranthaceae | Chinese Spinach | AMATRI | non-native | 0 | 5 | forb | annual |
| Amaranthus tuberculatus | Amaranthaceae | Tall Water Hemp | AMATUB | native | 0 | -3 | forb | annual |
| Amaranthus viridis | Amaranthaceae | Slender Amaranth | AMAVIR | non-native | 0 | 0 | forb | annual |
| Ambrosia acanthicarpa | Asteraceae | Annual Bursage | AMBACA | non-native | 0 | 5 | forb | annual |
| Ambrosia artemisiifolia | Asteraceae | Common Ragweed | AMBART | native | 0 | 3 | forb | annual |
| Ambrosia bidentata | Asteraceae | Southern Ragweed | AMBBID | native | 0 | 5 | forb | annual |
| Ambrosia psilostachya | Asteraceae | Western Ragweed | AMBPSI | native | 3 | 3 | forb | perennial |
| Ambrosia tomentosa | Asteraceae | False Ragweed | AMBTOM | non-native | 0 | 5 | forb | perennial |
| Ambrosia trifida | Asteraceae | Giant Ragweed | AMBTRI | native | 0 | 0 | forb | annual |
| Amelanchier arborea | Rosaceae | Shadbush | AMEARB | native | 6 | 3 | tree | perennial |
| Amelanchier humilis | Rosaceae | Low Shadbush | AMEHUM | non-native | 0 | 5 | shrub | perennial |
| Amianthium muscitoxicum | Liliaceae | Fly Poison | AMIMUS | native | 10 | 0 | forb | perennial |
| Ammannia coccinea | Lythraceae | Common Toothcup | AMMCOC | native | 6 | -5 | forb | annual |
| Ammannia robusta | Lythraceae | Grand Toothcup | AMMROB | native | 8 | -5 | forb | annual |
| Ammi majus | Apiaceae | Bishops Weed | AMMMAJ | non-native | 0 | 5 | forb | annual |
| Ammoselinum butleri | Apiaceae | Sand Parsley | AMMBUT | non-native | 0 | 0 | forb | annual |
| Amorpha canescens | Fabaceae | Lead Plant | AMOCAN | native | 8 | 5 | shrub | perennial |
| Amorpha fruticosa | Fabaceae | Indigo Bush | AMOFRU | native | 6 | -3 | shrub | perennial |
| Amorpha nitens | Fabaceae | Shining Indigo Bush | AMONIT | native | 8 | 0 | shrub | perennial |
| Ampelopsis arborea | Vitaceae | Pepper Vine | AMPARB | native | 7 | -3 | vine | perennial |
| Ampelopsis brevipedunculata | Vitaceae | Porcelain Berry | AMPBRE | non-native | 0 | 5 | vine | perennial |
| Ampelopsis cordata | Vitaceae | Raccoon Grape | AMPCOR | native | 3 | 0 | vine | perennial |
| Amphiachyris dracunculoides | Asteraceae | Broom Snakeroot | AMPDRA | native | 3 | 5 | forb | annual |
| Amphicarpaea bracteata | Fabaceae | Hog Peanut | AMPBRA | native | 4 | 0 | forb | annual |
| Amsinckia lycopsoides | Boraginaceae | Fiddleneck | AMSLYC | non-native | 0 | 5 | forb | annual |
| Amsinckia menziesii | Boraginaceae | Menzies Fiddleneck | AMSMEN | non-native | 0 | 5 | forb | annual |
| Amsinckia tessellata | Boraginaceae | Devils Lettuce | AMSTES | non-native | 0 | 5 | forb | annual |
| Amsonia ciliata var. filifolia | Apocynaceae | Ciliate Blue Star | AMSCIL | native | 10 | 5 | forb | perennial |
| Amsonia illustris | Apocynaceae | Shining Blue Star | AMSILL | native | 7 | 0 | forb | perennial |
| Amsonia tabernaemontana var. salicifolia | Apocynaceae | Blue Star | AMSTAS | native | 6 | -3 | forb | perennial |
| Amsonia tabernaemontana var. tabernaemontana | Apocynaceae | Blue Star | AMSTAT | native | 6 | -3 | forb | perennial |
| Anagallis arvensis | Primulaceae | Scarlet Pimpernel | ANAARV | non-native | 0 | 5 | forb | annual |
| Anagallis minima | Primulaceae | Chaffweed | ANAMIN | native | 5 | 5 | forb | annual |
| Anaphalis margaritacea | Asteraceae | Pearly Everlasting | ANAMAR | non-native | 0 | 5 | forb | perennial |
| Anchusa azurea | Boraginaceae | Showy Bugloss | ANCAZU | non-native | 0 | 5 | forb | perennial |
| Anchusa officinalis | Boraginaceae | Common Bugloss | ANCOFF | non-native | 0 | 5 | forb | perennial |
| Andrachne phyllanthoides | Euphorbiaceae | Glade Buckbrush | ANDPHY | native | 9 | 5 | shrub | perennial |
| Andropogon gerardii | Poaceae | Big Bluestem | ANDGER | native | 5 | 0 | grass | perennial |
| Andropogon gyrans | Poaceae | Elliotts Broom Sedge | ANDGYR | native | 3 | 5 | grass | perennial |
| Andropogon ternarius | Poaceae | Splitbeard Bluestem | ANDTER | native | 5 | 3 | grass | perennial |
| Andropogon virginicus | Poaceae | Broom Sedge | ANDVIR | native | 2 | 3 | grass | perennial |
| Androsace occidentalis | Primulaceae | Rock Jasmine | ANDOCC | native | 3 | 3 | forb | annual |
| Anemone acutiloba | Ranunculaceae | Sharp-Lobed Hepatica | ANEACU | native | 7 | 5 | forb | perennial |
| Anemone americana | Ranunculaceae | Round-Lobed Hepatica | ANEAME | native | 6 | 5 | forb | perennial |
| Anemone canadensis | Ranunculaceae | Meadow Anemone | ANECAN | native | 6 | -3 | forb | perennial |
| Anemone caroliniana | Ranunculaceae | Carolina Anemone | ANECAR | native | 7 | 5 | forb | perennial |
| Anemone cylindrica | Ranunculaceae | Thimbleweed | ANECYL | native | 9 | 5 | forb | perennial |
| Anemone quinquefolia | Ranunculaceae | Wood Anemone | ANEQUI | native | 10 | 3 | forb | perennial |
| Anemone virginiana | Ranunculaceae | Tall Anemone | ANEVIR | native | 4 | 3 | forb | perennial |
| Anethum graveolens | Apiaceae | Dill | ANEGRA | non-native | 0 | 5 | forb | annual |
| Angelica venenosa | Apiaceae | Wood Angelica | ANGVEN | native | 8 | 5 | forb | perennial |
| Anoda cristata | Malvaceae | Crested Velvetleaf | ANOCRI | non-native | 0 | 3 | forb | annual |
| Antennaria neglecta | Asteraceae | Field Cats Foot | ANTNEG | native | 4 | 5 | forb | perennial |
| Antennaria parlinii | Asteraceae | Pussys Toes | ANTPAR | native | 5 | 5 | forb | perennial |
| Anthemis arvensis | Asteraceae | Corn Chamomile | ANTARV | non-native | 0 | 5 | forb | annual |
| Anthemis cotula | Asteraceae | Dog Fennel | ANTCOT | non-native | 0 | 3 | forb | annual |
| Anthoxanthum odoratum | Poaceae | Sweet Vernal Grass | ANTODO | non-native | 0 | 3 | grass | perennial |
| Anthriscus caucalis | Apiaceae | Chervil | ANTCAU | non-native | 0 | 5 | forb | annual |
| Antirrhinum majus | Plantaginaceae | Snapdragon | ANTMAJ | non-native | 0 | 5 | forb | perennial |
| Apera interrupta | Poaceae | Italian Wind Grass | APEINT | non-native | 0 | 5 | grass | annual |
| Apera spica-venti | Poaceae | Loose Silky Bent | APESPI | non-native | 0 | 5 | grass | annual |
| Aphanes australis | Rosaceae | Parsley Piert | APHAUS | non-native | 0 | 5 | forb | annual |
| Aphanostephus skirrhobasis | Asteraceae | Arkansas Lazydaisy | APHSKI | non-native | 0 | 5 | forb | annual |
| Apios americana | Fabaceae | Groundnut | APIAME | native | 6 | -3 | forb | perennial |
| Apium graveolens | Apiaceae | Celery | APIGRA | non-native | 0 | 5 | forb | perennial |
| Aplectrum hyemale | Orchidaceae | Putty Root Orchid | APLHYE | native | 8 | 0 | forb | perennial |
| Apocynum androsaemifolium | Apocynaceae | Spreading Dogbane | APOAND | native | 5 | 5 | forb | perennial |
| Apocynum cannabinum | Apocynaceae | Prairie Dogbane | APOCAN | native | 3 | 3 | forb | perennial |
| Apocynum sibiricum | Apocynaceae | Indian Hemp | APOSIB | native | 3 | 3 | forb | perennial |
| Apocynum x floribundum | Apocynaceae | Intermediate Dogbane | APOFLO | native | 4 | 5 | forb | perennial |
| Aquilegia canadensis | Ranunculaceae | Columbine | AQUCAN | native | 6 | 3 | forb | perennial |
| Arabidopsis lyrata | Brassicaceae | Sand Cress | ARALYR | native | 8 | 3 | forb | biennial |
| Arabidopsis thaliana | Brassicaceae | Mouse-Ear Cress | ARATHA | non-native | 0 | 5 | forb | annual |
| Arabis hirsuta | Brassicaceae | Hairy Rock Cress | ARAHIR | native | 6 | 3 | forb | biennial |
| Arachis hypogaea | Fabaceae | Peanut | ARAHYP | non-native | 0 | 5 | forb | perennial |
| Aralia elata | Araliaceae | Japanese Angelica Tree | ARAELA | non-native | 0 | 5 | tree | perennial |
| Aralia nudicaulis | Araliaceae | Wild Sarsaparilla | ARANUD | native | 10 | 3 | forb | perennial |
| Aralia racemosa | Araliaceae | Spikenard | ARARAC | native | 8 | 3 | forb | perennial |
| Aralia spinosa | Araliaceae | Hercules Club | ARASPI | native | 6 | 0 | shrub | perennial |
| Arctium minus | Asteraceae | Common Burdock | ARCMIN | non-native | 0 | 3 | forb | biennial |
| Arenaria serpyllifolia | Caryophyllaceae | Thyme-Leaved Sandwort | ARESER | non-native | 0 | 3 | forb | annual |
| Argemone albiflora | Papaveraceae | Prickly Poppy | ARGALB | non-native | 0 | 5 | forb | annual |
| Argemone mexicana | Papaveraceae | Mexican Poppy | ARGMEX | non-native | 0 | 5 | forb | annual |
| Argyrochosma dealbata | Pteridaceae | Cloak Fern | ARGDEA | native | 9 | 5 | fern | perennial |
| Arisaema dracontium | Araceae | Green Dragon | ARIDRA | native | 6 | -3 | forb | perennial |
| Arisaema triphyllum | Araceae | Jack-In-The Pulpit | ARITRI | native | 6 | -3 | forb | perennial |
| Aristida adscensionis | Poaceae | Sixweeks Three-Awn | ARIADS | native | 5 | 5 | grass | annual |
| Aristida basiramea | Poaceae | Fork-Tipped Three-Awn Grass | ARIBAS | native | 4 | 5 | grass | annual |
| Aristida desmantha | Poaceae | Curly Three-Awn | ARIDES | native | 8 | 5 | grass | annual |
| Aristida dichotoma var. curtissii | Poaceae | Churchmouse Three-Awn | ARIDIU | native | 3 | 5 | grass | annual |
| Aristida dichotoma var. dichotoma | Poaceae | Poverty Grass | ARIDID | native | 3 | 5 | grass | annual |
| Aristida lanosa | Poaceae | Woollyleaf Three-Awn | ARILAN | native | 9 | 5 | grass | perennial |
| Aristida longespica var. geniculata | Poaceae | False Arrow Feather | ARILOG | native | 4 | 5 | grass | annual |
| Aristida longespica var. longespica | Poaceae | Slimspike Three-Awn | ARILOL | native | 2 | 5 | grass | annual |
| Aristida oligantha | Poaceae | Plains Three-Awn Grass | ARIOLI | native | 1 | 5 | grass | annual |
| Aristida purpurascens | Poaceae | Arrow Feather | ARIPUR | native | 5 | 0 | grass | perennial |
| Aristida ramosissima | Poaceae | Slender Three-Awn | ARIRAM | native | 4 | 5 | grass | annual |
| Aristolochia serpentaria var. hastata | Aristolochiaceae | Virginia Snakeroot | ARISEH | native | 6 | 5 | forb | perennial |
| Aristolochia serpentaria var. serpentaria | Aristolochiaceae | Virginia Snakeroot | ARISES | native | 6 | 5 | forb | perennial |
| Aristolochia tomentosa | Aristolochiaceae | Pipe-Vine | ARITOM | native | 7 | 5 | vine | perennial |
| Armoracia rusticana | Brassicaceae | Horse Radish | ARMRUS | non-native | 0 | 5 | forb | perennial |
| Arnoglossum atriplicifolium | Asteraceae | Pale Indian Plantain | ARNATR | native | 4 | 5 | forb | perennial |
| Arnoglossum plantagineum | Asteraceae | Prairie Indian Plantain | ARNPLA | native | 8 | 0 | forb | perennial |
| Arnoglossum reniforme | Asteraceae | Great Indian Plantain | ARNREN | native | 8 | 5 | forb | perennial |
| Aronia melanocarpa | Rosaceae | Black Chokeberry | AROMEL | native | 10 | 0 | shrub | perennial |
| Arrhenatherum elatius | Poaceae | Tall Oat Grass | ARRELA | non-native | 0 | 3 | grass | perennial |
| Artemisia absinthium | Asteraceae | Common Wormwood | ARTABS | non-native | 0 | 5 | forb | perennial |
| Artemisia annua | Asteraceae | Sweet Wormwood | ARTANN | non-native | 0 | 3 | forb | annual |
| Artemisia biennis | Asteraceae | Biennial Wormwood | ARTBIE | non-native | 0 | 0 | forb | biennial |
| Artemisia campestris subsp. caudata | Asteraceae | Beach Wormwood | ARTCAM | native | 5 | 5 | forb | biennial |
| Artemisia carruthii | Asteraceae | Kansas Mugwort | ARTCAR | non-native | 0 | 5 | forb | perennial |
| Artemisia dracunculus | Asteraceae | Tarragon | ARTDRA | native | 8 | 5 | forb | perennial |
| Artemisia frigida | Asteraceae | Prairie Sagebrush | ARTFRI | non-native | 0 | 5 | shrub | perennial |
| Artemisia ludoviciana var. ludoviciana | Asteraceae | White Sage | ARTLUL | native | 3 | 5 | forb | perennial |
| Artemisia ludoviciana var. mexicana | Asteraceae | Mexican White Sage | ARTLUM | native | 3 | 5 | forb | perennial |
| Artemisia stellariana | Asteraceae | Dusty Miller | ARTSTE | non-native | 0 | 3 | forb | perennial |
| Artemisia vulgaris | Asteraceae | Mugwort | ARTVUL | non-native | 0 | 5 | forb | perennial |
| Arthraxon hispidus | Poaceae | Small Carpgrass | ARTHIS | non-native | 0 | 0 | grass | annual |
| Arum italicum | Araceae | Italian Arum | ARUITA | non-native | 0 | 3 | forb | perennial |
| Aruncus dioicus var. pubescens | Rosaceae | Goats Beard | ARUDIO | native | 6 | 3 | forb | perennial |
| Arundinaria gigantea | Poaceae | Cane | ARUGIG | native | 7 | -3 | grass | perennial |
| Arundo donax | Poaceae | Giant Reed | ARUDON | non-native | 0 | 0 | grass | perennial |
| Asarum canadense | Aristolochiaceae | Wild Ginger | ASACAN | native | 6 | 3 | forb | perennial |
| Asclepias amplexicaulis | Asclepiadaceae | Sand Milkweed | ASCAMP | native | 7 | 5 | forb | perennial |
| Asclepias exaltata | Asclepiadaceae | Poke Milkweed | ASCEXA | native | 10 | 5 | forb | perennial |
| Asclepias hirtella | Asclepiadaceae | Tall Green Milkweed | ASCHIR | native | 4 | 5 | forb | perennial |
| Asclepias incarnata | Asclepiadaceae | Swamp Milkweed | ASCINC | native | 4 | -5 | forb | perennial |
| Asclepias meadii | Asclepiadaceae | Meads Milkweed | ASCMEA | native | 10 | 5 | forb | perennial |
| Asclepias perennis | Asclepiadaceae | White Milkweed | ASCPER | native | 9 | -5 | forb | perennial |
| Asclepias purpurascens | Asclepiadaceae | Purple Milkweed | ASCPUR | native | 6 | 3 | forb | perennial |
| Asclepias quadrifolia | Asclepiadaceae | Four-Leaved Milkweed | ASCQUA | native | 6 | 5 | forb | perennial |
| Asclepias speciosa | Asclepiadaceae | Showy Milkweed | ASCSPE | non-native | 0 | 0 | forb | perennial |
| Asclepias stenophylla | Asclepiadaceae | Glade Milkweed | ASCSTE | native | 9 | 5 | forb | perennial |
| Asclepias subverticillata | Asclepiadaceae | Poison Milkweed | ASCSUB | non-native | 0 | 3 | forb | perennial |
| Asclepias sullivantii | Asclepiadaceae | Prairie Milkweed | ASCSUL | native | 8 | 5 | forb | perennial |
| Asclepias syriaca | Asclepiadaceae | Common Milkweed | ASCSYR | native | 0 | 3 | forb | perennial |
| Asclepias tuberosa subsp. interior | Asclepiadaceae | Butterfly Weed | ASCTUB | native | 5 | 5 | forb | perennial |
| Asclepias variegata | Asclepiadaceae | White-Flowered Milkweed | ASCVAR | native | 9 | 3 | forb | perennial |
| Asclepias verticillata | Asclepiadaceae | Whorled Milkweed | ASCVER | native | 2 | 5 | forb | perennial |
| Asclepias viridiflora | Asclepiadaceae | Short Green Milkweed | ASCVIA | native | 7 | 5 | forb | perennial |
| Asclepias viridis | Asclepiadaceae | Green-Flowered Milkweed | ASCVIS | native | 5 | 5 | forb | perennial |
| Asimina triloba | Annonaceae | Pawpaw | ASITRI | native | 5 | 0 | tree | perennial |
| Asparagus officinalis | Liliaceae | Asparagus | ASPOFF | non-native | 0 | 3 | forb | perennial |
| Asparagus sprengeri | Liliaceae | Asparagus Fern | ASPSPR | non-native | 0 | 5 | forb | perennial |
| Asplenium bradleyi | Aspleniaceae | Bradleys Spleenwort | ASPBRA | native | 10 | 5 | fern | perennial |
| Asplenium montanum | Aspleniaceae | Mountain Spleenwort | ASPMON | native | 10 | 5 | fern | perennial |
| Asplenium pinnatifidum | Aspleniaceae | Lobed Spleenwort | ASPPIN | native | 10 | 5 | fern | perennial |
| Asplenium platyneuron | Aspleniaceae | Ebony Spleenwort | ASPPLA | native | 4 | 3 | fern | perennial |
| Asplenium resiliens | Aspleniaceae | Black Spleenwort | ASPRES | native | 9 | 5 | fern | perennial |
| Asplenium rhizophyllum | Aspleniaceae | Walking Fern | ASPRHI | native | 7 | 5 | fern | perennial |
| Asplenium ruta-muraria | Aspleniaceae | Wall-Rue Spleenwort | ASPRUT | native | 10 | 5 | fern | perennial |
| Asplenium trichomanes | Aspleniaceae | Maidenhair Spleenwort | ASPTRI | native | 9 | 5 | fern | perennial |
| Asplenium x ebenoides | Aspleniaceae | Walking Spleenwort | ASPEBE | native | 10 | 5 | fern | perennial |
| Asplenium x gravesii | Aspleniaceae | Graves Spleenwort | ASPGRA | native | 10 | 5 | fern | perennial |
| Aster tataricus | Asteraceae | Tatarian Aster | ASTTAT | non-native | 0 | 5 | forb | perennial |
| Astragalus canadensis | Fabaceae | Canadian Milk Vetch | ASTCAN | native | 6 | 0 | forb | perennial |
| Astragalus crassicarpus var. crassicarpus | Fabaceae | Indian Pea | ASTCRC | native | 10 | 5 | forb | perennial |
| Astragalus crassicarpus var. trichocalyx | Fabaceae | Ground Plum | ASTCRT | native | 7 | 5 | forb | perennial |
| Astragalus distortus | Fabaceae | Bent Milk Vetch | ASTDIS | native | 6 | 5 | forb | perennial |
| Astragalus lotiflorus | Fabaceae | Low Milk Vetch | ASTLOT | native | 10 | 5 | forb | perennial |
| Astranthium ciliatum | Asteraceae | Western Daisy | ASTCIL | native | 7 | 5 | forb | annual |
| Athyrium filix-femina | Dryopteridaceae | Lady Fern | ATHFIL | native | 8 | 0 | fern | perennial |
| Atocion armeria | Caryophyllaceae | Sweet William Catchfly | ATOARM | non-native | 0 | 5 | forb | annual |
| Atriplex argentea | Chenopodiaceae | Silver Orach | ATRARG | non-native | 0 | 0 | forb | annual |
| Atriplex hortensis | Chenopodiaceae | Garden Orach | ATRHOR | non-native | 0 | 3 | forb | annual |
| Atriplex micrantha | Chenopodiaceae | Russian Orach | ATRMIC | non-native | 0 | 5 | forb | annual |
| Atriplex patula | Chenopodiaceae | Common Orach | ATRPAT | non-native | 0 | -3 | forb | annual |
| Atriplex prostrata | Chenopodiaceae | Arrow-Leaved Orach | ATRPRO | non-native | 0 | 0 | forb | annual |
| Atriplex rosea | Chenopodiaceae | Red Orach | ATRROS | non-native | 0 | 3 | forb | annual |
| Atriplex truncata | Chenopodiaceae | Silver Scale | ATRTRU | non-native | 0 | 3 | forb | annual |
| Atriplex wrightii | Chenopodiaceae | Wrights Saltbush | ATRWRI | non-native | 0 | 5 | forb | annual |
| Aubrieta deltoidea | Brassicaceae | Purple Alyssum | AUBDEL | non-native | 0 | 5 | forb | perennial |
| Aureolaria flava var. calycosa | Orobanchaceae | Smooth False Foxglove | AURFLC | native | 8 | 5 | forb | perennial |
| Aureolaria flava var. flava | Orobanchaceae | Smooth False Foxglove | AURFLF | native | 8 | 5 | forb | perennial |
| Aureolaria grandiflora var. pulchra | Orobanchaceae | Yellow False Foxglove | AURGRP | native | 6 | 5 | forb | perennial |
| Aureolaria grandiflora var. serrata | Orobanchaceae | Big-Flowered Gerardia | AURGRS | native | 6 | 5 | forb | perennial |
| Aureolaria pectinata | Orobanchaceae | Clammy False Foxglove | AURPEC | native | 7 | 5 | forb | annual |
| Avena fatua var. fatua | Poaceae | Wild Oats | AVEFAF | non-native | 0 | 5 | grass | annual |
| Avena fatua var. sativa | Poaceae | Oats | AVEFAS | non-native | 0 | 5 | grass | annual |
| Axyris amaranthoides | Chenopodiaceae | Russian Pigweed | AXYAMA | non-native | 0 | 5 | forb | annual |
| Azolla caroliniana | Azollaceae | Eastern Water Fern | AZOCAR | native | 8 | -5 | fern | annual |
| Azolla mexicana | Azollaceae | Water Fern | AZOMEX | native | 8 | -5 | fern | annual |
| Baccharis wrightii | Asteraceae | Wrights False Willow | BACWRI | non-native | 0 | 3 | shrub | perennial |
| Bacopa rotundifolia | Plantaginaceae | Water Hyssop | BACROT | native | 6 | -5 | forb | perennial |
| Baptisia alba var. macrophylla | Fabaceae | White Wild Indigo | BAPALB | native | 6 | 3 | forb | perennial |
| Baptisia australis var. minor | Fabaceae | Blue Wild Indigo | BAPAUS | native | 8 | 5 | forb | perennial |
| Baptisia bracteata var. leucophaea | Fabaceae | Cream Wild Indigo | BAPBRA | native | 7 | 5 | forb | perennial |
| Baptisia sphaerocarpa | Fabaceae | Yellow Wild Indigo | BAPSPH | non-native | 0 | 5 | forb | perennial |
| Barbarea verna | Brassicaceae | Early Wintercress | BARVER | non-native | 0 | 5 | forb | biennial |
| Barbarea vulgaris | Brassicaceae | Yellow Rocket | BARVUL | non-native | 0 | 3 | forb | biennial |
| Bartonia paniculata | Gentianaceae | Screwstem | BARPAN | native | 10 | -5 | forb | annual |
| Bartonia virginica | Gentianaceae | Yellow Screwstem | BARVIR | native | 10 | -3 | forb | annual |
| Belamcanda chinensis | Iridaceae | Blackberry Lily | BELCHI | non-native | 0 | 5 | forb | perennial |
| Berberis canadensis | Berberidaceae | American Barberry | BERCAN | native | 10 | 5 | shrub | perennial |
| Berberis thunbergii | Berberidaceae | Japanese Barberry | BERTHU | non-native | 0 | 3 | shrub | perennial |
| Berberis vulgaris | Berberidaceae | European Barberry | BERVUL | non-native | 0 | 3 | shrub | perennial |
| Berchemia scandens | Rhamnaceae | Supple Jack | BERSCA | native | 6 | 0 | vine | perennial |
| Bergia texana | Elatinaceae | Bergia | BERGTE | native | 7 | -5 | forb | annual |
| Berlandiera texana | Asteraceae | Green Eyes | BERLTE | native | 5 | 5 | forb | perennial |
| Berteroa incana | Brassicaceae | Hoary Alyssum | BERINC | non-native | 0 | 5 | forb | annual |
| Berula erecta | Apiaceae | Fen Water Parsnip | BERERE | native | 10 | -5 | forb | perennial |
| Beta vulgaris | Chenopodiaceae | Beta | BETVUL | non-native | 0 | 5 | forb | biennial |
| Betula nigra | Betulaceae | River Birch | BETNIG | native | 4 | -3 | tree | perennial |
| Bidens alba var. radiata | Asteraceae | Romerillo | BIDALB | non-native | 0 | 5 | forb | annual |
| Bidens aristosa | Asteraceae | Swamp Marigold | BIDARI | native | 1 | -3 | forb | annual |
| Bidens beckii | Asteraceae | Water Marigold | BIDBEC | native | 10 | -5 | forb | perennial |
| Bidens bipinnata | Asteraceae | Spanish Needles | BIDBIP | non-native | 0 | 3 | forb | annual |
| Bidens cernua | Asteraceae | Nodding Bur Marigold | BIDCER | native | 5 | -5 | forb | annual |
| Bidens comosa | Asteraceae | Swamp Tickseed | BIDCOM | native | 3 | -3 | forb | annual |
| Bidens connata | Asteraceae | Purple-Stemmed Tickseed | BIDCON | native | 3 | -3 | forb | annual |
| Bidens discoidea | Asteraceae | Swamp Beggars Ticks | BIDDIS | native | 8 | -3 | forb | annual |
| Bidens frondosa | Asteraceae | Common Beggars Ticks | BIDFRO | native | 2 | -3 | forb | annual |
| Bidens laevis | Asteraceae | Smooth Beggars Ticks | BIDLAE | native | 10 | -5 | forb | annual |
| Bidens polylepis | Asteraceae | Bur Marigold | BIDPOL | native | 1 | -3 | forb | annual |
| Bidens trichosperma | Asteraceae | Tall Swamp Marigold | BIDTRI | non-native | 0 | -5 | forb | annual |
| Bidens vulgata | Asteraceae | Tall Beggars Ticks | BIDVUL | native | 1 | 0 | forb | annual |
| Bignonia capreolata | Bignoniaceae | Cross-Vine | BIGCAP | native | 6 | -3 | vine | perennial |
| Blephilia ciliata | Lamiaceae | Ohio Horse Mint | BLECIL | native | 6 | 5 | forb | perennial |
| Blephilia hirsuta | Lamiaceae | Wood Mint | BLEHIR | native | 7 | 3 | forb | perennial |
| Boechera canadensis | Brassicaceae | Sickle Pod | BOECAN | native | 4 | 5 | forb | biennial |
| Boechera laevigata | Brassicaceae | Smooth Bank Cress | BOELAE | native | 6 | 5 | forb | biennial |
| Boechera missouriensis | Brassicaceae | Missouri Rock Cress | BOEMIS | native | 5 | 5 | forb | biennial |
| Boechera shortii | Brassicaceae | Toothed Cress | BOESHO | native | 6 | 3 | forb | biennial |
| Boehmeria cylindrica | Urticaceae | False Nettle | BOECYL | native | 4 | -5 | forb | perennial |
| Boerhaavia erecta | Nyctaginaceae | Spiderling | BOEERE | non-native | 0 | 5 | forb | annual |
| Bolboschoenus fluviatilis | Cyperaceae | River Bulrush | BOLFLU | native | 6 | -5 | sedge | perennial |
| Bolboschoenus maritimus subsp. paludosus | Cyperaceae | Alkali Bulrush | BOLMAR | native | 10 | -5 | sedge | perennial |
| Boltonia asteroides | Asteraceae | False Aster | BOLAST | native | 4 | -3 | forb | perennial |
| Boltonia decurrens | Asteraceae | Decurrent False Aster | BOLDEC | native | 8 | -5 | forb | perennial |
| Boltonia diffusa | Asteraceae | Dolls Daisy | BOLDIF | native | 7 | -3 | forb | perennial |
| Bothriochloa bladhii | Poaceae | Caucasian Bluestem | BOTBLA | non-native | 0 | 3 | grass | perennial |
| Bothriochloa ischaemum | Poaceae | Yellow Bluestem | BOTISC | non-native | 0 | 5 | grass | perennial |
| Bothriochloa laguroides subsp. torreyana | Poaceae | Silver Beard Grass | BOTLAG | native | 0 | 5 | grass | perennial |
| Botrychium biternatum | Ophioglossaceae | Grape Fern | BOTBIT | native | 10 | 5 | fern | perennial |
| Botrychium dissectum | Ophioglossaceae | Cut-Leaved Grape Fern | BOTDIS | native | 5 | 5 | fern | perennial |
| Botrychium virginianum | Ophioglossaceae | Rattlesnake Fern | BOTVIR | native | 4 | 5 | fern | perennial |
| Bouteloua curtipendula | Poaceae | Side-Oats Grama | BOUCUR | native | 7 | 5 | grass | perennial |
| Bouteloua gracilis | Poaceae | Blue Grama | BOUGRA | native | 8 | 5 | grass | perennial |
| Bouteloua hirsuta | Poaceae | Hairy Grama | BOUHIR | native | 10 | 5 | grass | perennial |
| Brachiaria eruciformis | Poaceae | Signal Grass | BRAERU | non-native | 0 | 5 | grass | annual |
| Brachyelytrum erectum | Poaceae | Long-Awned Wood Grass | BRAERE | native | 5 | 3 | grass | perennial |
| Bradburia pilosa | Asteraceae | Soft-Golden Aster | BRAPIL | native | 3 | 5 | forb | annual |
| Brasenia schreberi | Cabombaceae | Water Shield | BRASCH | native | 2 | -5 | forb | perennial |
| Brassica juncea | Brassicaceae | Indian Mustard | BRAJUN | non-native | 0 | 5 | forb | annual |
| Brassica napus | Brassicaceae | Turnip | BRANAP | non-native | 0 | 5 | forb | annual |
| Brassica nigra | Brassicaceae | Black Mustard | BRANIG | non-native | 0 | 5 | forb | annual |
| Brassica rapa | Brassicaceae | Field Mustard | BRARAP | non-native | 0 | 5 | forb | annual |
| Brickellia eupatorioides var. eupatorioides | Asteraceae | False Boneset | BRIEUE | native | 6 | 5 | forb | perennial |
| Brickellia eupatorioides var. texana | Asteraceae | Ozark False Boneset | BRIEUT | native | 7 | 5 | forb | perennial |
| Brickellia grandiflora | Asteraceae | Tassel Flower | BRIGRA | native | 10 | 5 | forb | perennial |
| Bromus commutatus | Poaceae | Hairy Chess | BROCOM | non-native | 0 | 5 | grass | annual |
| Bromus diandrus | Poaceae | Ribgut Grass | BRODIA | non-native | 0 | 5 | grass | annual |
| Bromus hordaceus | Poaceae | Soft Chess | BROHOR | non-native | 0 | 5 | grass | annual |
| Bromus inermis | Poaceae | Smooth Brome | BROINE | non-native | 0 | 5 | grass | perennial |
| Bromus japonicus | Poaceae | Japanese Chess | BROJAP | non-native | 0 | 3 | grass | annual |
| Bromus latiglumis | Poaceae | Ear-Leaved Brome | BROLAT | native | 7 | -3 | grass | perennial |
| Bromus nottowayanus | Poaceae | Nottoway Brome | BRONOT | native | 8 | 5 | grass | perennial |
| Bromus pubescens | Poaceae | Woodland Brome | BROPUB | native | 5 | 5 | grass | perennial |
| Bromus racemosus | Poaceae | Smooth Chess | BRORAC | non-native | 0 | 5 | grass | annual |
| Bromus secalinus | Poaceae | Chess | BROSEC | non-native | 0 | 5 | grass | annual |
| Bromus squarrosus | Poaceae | Nodding Brome | BROSQU | non-native | 0 | 5 | grass | perennial |
| Bromus sterilis | Poaceae | Poverty Brome | BROSTE | non-native | 0 | 5 | grass | annual |
| Bromus tectorum | Poaceae | Downy Brome | BROTEC | non-native | 0 | 5 | grass | annual |
| Bromus willdenowii | Poaceae | Rescue Grass | BROWIL | non-native | 0 | 5 | grass | annual |
| Broussonetia papyrifera | Moraceae | Paper Mulberry | BROPAP | non-native | 0 | 3 | tree | perennial |
| Brunnera macrophylla | Boraginaceae | Siberian Bugloss | BRUMAC | non-native | 0 | 5 | forb | perennial |
| Brunnichia ovata | Polygonaceae | Ladies Eardrops | BRUOVA | native | 4 | -3 | vine | perennial |
| Buchloe dactyloides | Poaceae | Buffalo Grass | BUCDAC | native | 5 | 3 | grass | perennial |
| Buchnera americana | Orobanchaceae | Blue Hearts | BUCAME | native | 10 | 3 | forb | perennial |
| Buddleja davidii | Scrophulariaceae | Butterfly Bush | BUDDAV | non-native | 0 | 3 | shrub | perennial |
| Buglossoides arvense | Boraginaceae | Corn Gromwell | BUGARV | non-native | 0 | 5 | forb | annual |
| Bulbostylis capillaris | Cyperaceae | Hair Sedge | BULCAP | native | 4 | 3 | sedge | annual |
| Bupleurum rotundifolium | Apiaceae | Hares Ear | BUPROT | non-native | 0 | 5 | forb | annual |
| Cabomba caroliniana | Cabombaceae | Fanwort | CABCAR | native | 8 | -5 | forb | perennial |
| Calamagrostis canadensis | Poaceae | Blue Joint Grass | CALCAN | native | 6 | -5 | grass | perennial |
| Calamagrostis porteri subsp. insperata | Poaceae | Reed Bent Grass | CALPOR | native | 10 | 5 | grass | perennial |
| Calamagrostis stricta subsp. inexpansa | Poaceae | Bog Reed Grass | CALSTR | native | 8 | -3 | grass | perennial |
| Calamovilfa longifolia | Poaceae | Sand Reed | CALLON | non-native | 0 | 5 | grass | perennial |
| Callicarpa americana | Lamiaceae | American Beauty Berry | CALAME | native | 10 | 3 | shrub | perennial |
| Callicarpa dichotoma | Lamiaceae | Chinese Beauty Berry | CALDIC | non-native | 0 | 0 | shrub | perennial |
| Callirhoe alcaeoides | Malvaceae | Pink Poppy Mallow | CALALC | native | 6 | 5 | forb | perennial |
| Callirhoe bushii | Malvaceae | Bushs Poppy Mallow | CALBUS | native | 9 | 5 | forb | perennial |
| Callirhoe digitata | Malvaceae | Fringed Poppy Mallow | CALDIG | native | 8 | 5 | forb | perennial |
| Callirhoe involucrata | Malvaceae | Purple Poppy Mallow | CALINV | native | 5 | 5 | forb | perennial |
| Callirhoe triangulata | Malvaceae | Clustered Poppy Mallow | CALTRI | native | 10 | 5 | forb | perennial |
| Callitriche heterophylla | Plantaginaceae | Large Water Starwort | CALHET | native | 6 | -5 | forb | annual |
| Callitriche palustris | Plantaginaceae | Common Water Starwort | CALLPA | native | 9 | -5 | forb | annual |
| Callitriche terrestris | Plantaginaceae | Terrestrial Starwort | CALTER | native | 3 | -3 | forb | annual |
| Calopogon oklahomensis | Orchidaceae | Prairie Grass Pink | CALOKL | native | 10 | 3 | forb | perennial |
| Calopogon tuberosus | Orchidaceae | Grass Pink | CALTUB | native | 10 | -5 | forb | perennial |
| Caltha palustris | Ranunculaceae | Marsh Marigold | CALTPA | native | 10 | -5 | forb | perennial |
| Calycanthus floridus | Calycanthaceae | Carolina Allspice | CALFLO | non-native | 0 | 3 | shrub | perennial |
| Calycocarpum lyonii | Menispermaceae | Cupseed | CALLYO | native | 7 | -3 | vine | perennial |
| Calylophus serrulatus | Onagraceae | Toothed Evening Primrose | CALSER | native | 4 | 5 | forb | perennial |
| Calystegia macounii | Convolvulaceae | Macouns Bindweed | CALMAC | native | 5 | 5 | forb | perennial |
| Calystegia pubescens | Convolvulaceae | Japanese Bindweed | CALPUB | non-native | 0 | 5 | forb | perennial |
| Calystegia sepium | Convolvulaceae | Hedge Bindweed | CALSEP | native | 1 | 0 | forb | perennial |
| Calystegia silvatica subsp. fraterniflora | Convolvulaceae | Shortstalk Bindweed | CALSIL | native | 1 | 5 | forb | perennial |
| Calystegia spithamaea | Convolvulaceae | Low Bindweed | CALSPI | native | 9 | 5 | forb | perennial |
| Camassia angusta | Liliaceae | Prairie Hyacinth | CAMANG | native | 10 | 5 | forb | perennial |
| Camassia scilloides | Liliaceae | Wild Hyacinth | CAMSCI | native | 6 | 3 | forb | perennial |
| Camelina microcarpa | Brassicaceae | Small-Fruited False Flax | CAMMIC | non-native | 0 | 3 | forb | annual |
| Camelina sativa | Brassicaceae | False Flax | CAMSAT | non-native | 0 | 5 | forb | annual |
| Campanula americana | Campanulaceae | Tall Bellflower | CAMAME | native | 4 | 0 | forb | annual |
| Campanula aparinoides | Campanulaceae | Marsh Bellflower | CAMAPA | native | 10 | -5 | forb | perennial |
| Campanula rapunculoides | Campanulaceae | European Bellflower | CAMRAP | non-native | 0 | 5 | forb | perennial |
| Campanula rotundifolia | Campanulaceae | Harebell | CAMROT | native | 10 | 3 | forb | perennial |
| Campsis radicans | Bignoniaceae | Trumpet Creeper | CAMRAD | native | 3 | 0 | vine | perennial |
| Canavalia ensiformis | Fabaceae | Jack Bean | CANENS | non-native | 0 | 5 | forb | annual |
| Cannabis sativa | Cannabaceae | Hemp | CANSAT | non-native | 0 | 3 | forb | annual |
| Capsella bursa-pastoris | Brassicaceae | Shepherds Purse | CAPBUR | non-native | 0 | 3 | forb | annual |
| Capsicum annuum | Solanaceae | Cayenne Pepper | CAPANN | non-native | 0 | 5 | forb | annual |
| Cardamine bulbosa | Brassicaceae | Bulbous Cress | CARBUL | native | 7 | -5 | forb | perennial |
| Cardamine concatenata | Brassicaceae | Toothwort | CARCON | native | 4 | 3 | forb | perennial |
| Cardamine diphylla | Brassicaceae | Crinkleroot | CARDIP | native | 10 | 5 | forb | perennial |
| Cardamine douglasii | Brassicaceae | Purple Spring Cress | CARDOU | native | 9 | -3 | forb | perennial |
| Cardamine flexuosa | Brassicaceae | Woodland Bitter Cress | CARFLE | non-native | 0 | 3 | forb | biennial |
| Cardamine hirsuta | Brassicaceae | Hairy Bitter Cress | CARHIR | non-native | 0 | 3 | forb | annual |
| Cardamine parviflora var. arenicola | Brassicaceae | Small-Flowered Bitter Cress | CARPAR | native | 3 | 3 | forb | annual |
| Cardamine pensylvanica | Brassicaceae | Pennsylvania Bitter Cress | CARPEN | native | 6 | -3 | forb | biennial |
| Cardiospermum halicacabum | Sapindaceae | Balloon Vine | CARHAL | non-native | 0 | 0 | forb | annual |
| Carduus crispus | Asteraceae | Welted Thistle | CARCRI | non-native | 0 | 5 | forb | biennial |
| Carduus nutans | Asteraceae | Musk Thistle | CARNUT | non-native | 0 | 5 | forb | biennial |
| Carex abscondita | Cyperaceae | Thicket Sedge | CXABSC | native | 10 | 0 | sedge | perennial |
| Carex aggregata | Cyperaceae | Glomerate Sedge | CXAGGR | native | 4 | 5 | sedge | perennial |
| Carex alata | Cyperaceae | Winged Sedge | CXALAT | native | 9 | -5 | sedge | perennial |
| Carex albicans var. albicans | Cyperaceae | Bellows-Beaked Sedge | CXALBB | native | 6 | 5 | sedge | perennial |
| Carex albicans var. australis | Cyperaceae | White-Tinged Sedge | CXALBS | native | 6 | 5 | sedge | perennial |
| Carex albolutescens | Cyperaceae | Greenish-White Sedge | CXALBO | native | 9 | -3 | sedge | perennial |
| Carex albursina | Cyperaceae | White Bear Sedge | CXALBU | native | 9 | 5 | sedge | perennial |
| Carex amphibola | Cyperaceae | Narrow-Leaved Sedge | CXAMPH | native | 3 | 0 | sedge | perennial |
| Carex annectens var. annectens | Cyperaceae | Yellow-Fruited Sedge | CXANNA | native | 4 | -3 | sedge | perennial |
| Carex annectens var. xanthocarpa | Cyperaceae | Yellow-Fruited Sedge | CXANNX | native | 4 | -3 | sedge | perennial |
| Carex aquatilis | Cyperaceae | Water Sedge | CXAQUA | native | 10 | -5 | sedge | perennial |
| Carex arkansana | Cyperaceae | Arkansas Sedge | CXARKA | native | 8 | -3 | sedge | perennial |
| Carex atherodes | Cyperaceae | Slough Sedge | CXATHE | native | 10 | -5 | sedge | perennial |
| Carex atlantica | Cyperaceae | Prickly Bog Sedge | CXATLA | native | 10 | -3 | sedge | perennial |
| Carex aureolensis | Cyperaceae | Splendid Sedge | CXAURE | native | 5 | -3 | sedge | perennial |
| Carex austrina | Cyperaceae | Southern Sedge | CXAUST | native | 5 | 3 | sedge | perennial |
| Carex bicknellii | Cyperaceae | Bicknells Sedge | CXBICK | native | 8 | 3 | sedge | perennial |
| Carex blanda | Cyperaceae | Common Wood Sedge | CXBLAN | native | 2 | 0 | sedge | perennial |
| Carex brevior | Cyperaceae | Short-Beaked Sedge | CXBREV | native | 4 | 0 | sedge | perennial |
| Carex bromoides | Cyperaceae | Brome-Like Sedge | CXBROM | native | 10 | -3 | sedge | perennial |
| Carex bushii | Cyperaceae | Bushs Sedge | CXBUSH | native | 4 | 3 | sedge | perennial |
| Carex buxbaumii | Cyperaceae | Brown Bog Sedge | CXBUXB | native | 10 | -5 | sedge | perennial |
| Carex careyana | Cyperaceae | Careys Sedge | CXCARY | native | 9 | 5 | sedge | perennial |
| Carex caroliniana | Cyperaceae | Carolina Sedge | CXCARO | native | 7 | -3 | sedge | perennial |
| Carex cephalophora | Cyperaceae | Woodbank Sedge | CXCEPH | native | 5 | 3 | sedge | perennial |
| Carex cherokeensis | Cyperaceae | Cherokee Sedge | CXCHER | native | 7 | -3 | sedge | perennial |
| Carex communis | Cyperaceae | Fibrous-Rooted Sedge | CXCOMM | native | 10 | 5 | sedge | perennial |
| Carex comosa | Cyperaceae | Bristly Sedge | CXCOMO | native | 9 | -5 | sedge | perennial |
| Carex complanata | Cyperaceae | Hirsute Sedge | CXCOMP | native | 9 | 3 | sedge | perennial |
| Carex conjuncta | Cyperaceae | Soft Fox Sedge | CXCONJ | native | 5 | -3 | sedge | perennial |
| Carex conoidea | Cyperaceae | Field Sedge | CXCONO | native | 10 | -3 | sedge | perennial |
| Carex corrugata | Cyperaceae | Prune-Fruit Sedge | CXCORR | native | 8 | -3 | sedge | perennial |
| Carex crawei | Cyperaceae | Crawes Sedge | CXCRAE | native | 10 | 3 | sedge | perennial |
| Carex crawfordii | Cyperaceae | Crawfords Sedge | CXCRAF | non-native | 0 | 0 | sedge | perennial |
| Carex crinita | Cyperaceae | Fringed Sedge | CXCRIN | native | 7 | -5 | sedge | perennial |
| Carex cristatella | Cyperaceae | Crested Sedge | CXCRIS | native | 4 | -3 | sedge | perennial |
| Carex crus-corvi | Cyperaceae | Ravens Foot Sedge | CXCRUS | native | 6 | -5 | sedge | perennial |
| Carex cumberlandensis | Cyperaceae | Cumberland Sedge | CXCUMB | native | 10 | 5 | sedge | perennial |
| Carex davisii | Cyperaceae | Davis Sedge | CXDAVI | native | 3 | 0 | sedge | perennial |
| Carex debilis | Cyperaceae | White-Edged Sedge | CXDEBI | native | 10 | -3 | sedge | perennial |
| Carex decomposita | Cyperaceae | Epiphytic Sedge | CXDECO | native | 10 | -5 | sedge | perennial |
| Carex digitalis | Cyperaceae | Narrow-Leaved Wood Sedge | CXDIGI | native | 7 | 5 | sedge | perennial |
| Carex douglasii | Cyperaceae | Douglas Sedge | CXDOUG | non-native | 0 | 0 | sedge | perennial |
| Carex eburnea | Cyperaceae | Bristle-Leaved Sedge | CXEBUR | native | 7 | 3 | sedge | perennial |
| Carex eleocharis | Cyperaceae | Needleleaf Sedge | CXELEO | non-native | 0 | 5 | sedge | perennial |
| Carex emoryi | Cyperaceae | Emorys Sedge | CXEMOR | native | 6 | -5 | sedge | perennial |
| Carex festucacea | Cyperaceae | Fescue Sedge | CXFEST | native | 5 | 0 | sedge | perennial |
| Carex fissa | Cyperaceae | Swale Sedge | CXFISS | native | 6 | -3 | sedge | perennial |
| Carex flaccosperma | Cyperaceae | Thin-Fruited Sedge | CXFLAC | native | 8 | -3 | sedge | perennial |
| Carex frankii | Cyperaceae | Franks Sedge | CXFRAN | native | 2 | 0 | sedge | perennial |
| Carex gigantea | Cyperaceae | Large Sedge | CXGIGA | native | 9 | -5 | sedge | perennial |
| Carex glaucodea | Cyperaceae | Blue Sedge | CXGLAU | native | 4 | 3 | sedge | perennial |
| Carex gracilescens | Cyperaceae | Slender Wood Sedge | CXGRAS | native | 7 | 5 | sedge | perennial |
| Carex gracillima | Cyperaceae | Graceful Sedge | CXGRAA | native | 10 | 3 | sedge | perennial |
| Carex granularis | Cyperaceae | Meadow Sedge | CXGRAN | native | 4 | -3 | sedge | perennial |
| Carex gravida | Cyperaceae | Heavy Sedge | CXGRAV | native | 5 | 0 | sedge | perennial |
| Carex grayii | Cyperaceae | Bur Sedge | CXGRAY | native | 7 | -3 | sedge | perennial |
| Carex grisea | Cyperaceae | Gray Sedge | CXGRIS | native | 4 | 0 | sedge | perennial |
| Carex haydenii | Cyperaceae | Cloud Sedge | CXHAYD | native | 9 | -5 | sedge | perennial |
| Carex hirsutella | Cyperaceae | Fuzzy Wuzzy Sedge | CXHIRS | native | 4 | 5 | sedge | perennial |
| Carex hirtifolia | Cyperaceae | Hairy Sedge | CXHIRT | native | 7 | 5 | sedge | perennial |
| Carex hitchcockiana | Cyperaceae | Hitchcocks Sedge | CXHITC | native | 9 | 5 | sedge | perennial |
| Carex hyalinolepis | Cyperaceae | Shoreline Sedge | CXHYAL | native | 6 | -5 | sedge | perennial |
| Carex hystericina | Cyperaceae | Bottlebrush Sedge | CXHYST | native | 7 | -5 | sedge | perennial |
| Carex inops subsp. heliophila | Cyperaceae | Sun Sedge | CXINOP | native | 6 | 5 | sedge | perennial |
| Carex interior | Cyperaceae | Interior Sedge | CXINTE | native | 10 | -5 | sedge | perennial |
| Carex intumescens | Cyperaceae | Swollen Sedge | CXINTU | native | 7 | -3 | sedge | perennial |
| Carex jamesii | Cyperaceae | Grass Sedge | CXJAME | native | 4 | 5 | sedge | perennial |
| Carex joorii | Cyperaceae | Cypress Swamp Sedge | CXJOOR | native | 10 | -5 | sedge | perennial |
| Carex lacustris | Cyperaceae | Lake Bank Sedge | CXLACU | native | 10 | -5 | sedge | perennial |
| Carex laeviconica | Cyperaceae | Smooth Cone Sedge | CXLAEC | native | 9 | -5 | sedge | perennial |
| Carex laevivaginata | Cyperaceae | Smooth-Sheath Sedge | CXLAEV | native | 10 | -5 | sedge | perennial |
| Carex laxiculmis var. copulata | Cyperaceae | Spreading Sedge | CXLAXC | native | 10 | 5 | sedge | perennial |
| Carex laxiculmis var. laxiculmis | Cyperaceae | Spreading Sedge | CXLAXL | native | 10 | 5 | sedge | perennial |
| Carex laxiflora | Cyperaceae | Beechwood Sedge | CXLAXF | native | 10 | 3 | sedge | perennial |
| Carex leavenworthii | Cyperaceae | Leavenworths Sedge | CXLEAV | native | 3 | 5 | sedge | perennial |
| Carex leptalea | Cyperaceae | Bristle-Stalked Sedge | CXLEPT | native | 10 | -5 | sedge | perennial |
| Carex longii | Cyperaceae | Longs Sedge | CXLONG | native | 10 | -5 | sedge | perennial |
| Carex louisianica | Cyperaceae | Louisiana Sedge | CXLOUI | native | 8 | -5 | sedge | perennial |
| Carex lupuliformis | Cyperaceae | Knobbed Hop Sedge | CXLUPF | native | 9 | -5 | sedge | perennial |
| Carex lupulina | Cyperaceae | Common Hop Sedge | CXLUPL | native | 6 | -5 | sedge | perennial |
| Carex lurida | Cyperaceae | Sallow Sedge | CXLURI | native | 6 | -5 | sedge | perennial |
| Carex meadii | Cyperaceae | Meads Sedge | CXMEAD | native | 6 | 0 | sedge | perennial |
| Carex mesochorea | Cyperaceae | Oval-Headed Sedge | CXMESO | native | 3 | 3 | sedge | perennial |
| Carex microdonta | Cyperaceae | Little Tooth Sedge | CXMICR | native | 10 | 0 | sedge | perennial |
| Carex missouriensis | Cyperaceae | Missouri Sedge | CXMISS | native | 8 | -3 | sedge | perennial |
| Carex molesta | Cyperaceae | Troublesome Sedge | CXMOLA | native | 3 | 0 | sedge | perennial |
| Carex molestiformis | Cyperaceae | Frightful Sedge | CXMOLI | native | 4 | 0 | sedge | perennial |
| Carex muehlenbergii var. enervis | Cyperaceae | Sand Sedge | CXMUHE | native | 8 | 5 | sedge | perennial |
| Carex muehlenbergii var. muehlenbergii | Cyperaceae | Sand Sedge | CXMUHM | native | 5 | 5 | sedge | perennial |
| Carex muskingumensis | Cyperaceae | Swamp Sedge | CXMUSK | native | 9 | -5 | sedge | perennial |
| Carex nebrascensis | Cyperaceae | Nebraska Sedge | CXNEBR | non-native | 0 | -5 | sedge | perennial |
| Carex nigromarginata var. floridana | Cyperaceae | Black-Edged Sedge | CXNIGF | native | 7 | 5 | sedge | perennial |
| Carex nigromarginata var. nigromarginata | Cyperaceae | Black-Edged Sedge | CXNIGN | native | 7 | 5 | sedge | perennial |
| Carex normalis | Cyperaceae | Larger Straw Sedge | CXNORM | native | 4 | -3 | sedge | perennial |
| Carex oklahomensis | Cyperaceae | Oklahoma Sedge | CXOKLA | native | 8 | -5 | sedge | perennial |
| Carex oligocarpa | Cyperaceae | Few-Fruited Sedge | CXOLIG | native | 6 | 5 | sedge | perennial |
| Carex opaca | Cyperaceae | Prairie Sedge | CXOPAC | native | 9 | -3 | sedge | perennial |
| Carex oxylepis | Cyperaceae | Sharp-Scaled Sedge | CXOXYL | native | 10 | -3 | sedge | perennial |
| Carex pellita | Cyperaceae | Woolly Sedge | CXPELL | native | 5 | -5 | sedge | perennial |
| Carex pensylvanica | Cyperaceae | Pennsylvania Sedge | CXPENS | native | 6 | 5 | sedge | perennial |
| Carex planispicata | Cyperaceae | Flat-Spiked Sedge | CXPLAN | native | 8 | 5 | sedge | perennial |
| Carex praegracilis | Cyperaceae | Tollway Sedge | CXPRAE | non-native | 0 | 0 | sedge | perennial |
| Carex prasina | Cyperaceae | Leek Sedge | CXPRAS | native | 8 | -5 | sedge | perennial |
| Carex radiata | Cyperaceae | Eastern Star Sedge | CXRADI | native | 5 | 0 | sedge | perennial |
| Carex reniformis | Cyperaceae | Kidney-Fruited Sedge | CXRENE | native | 10 | -3 | sedge | perennial |
| Carex retroflexa | Cyperaceae | Reflexed Sedge | CXRETR | native | 4 | 3 | sedge | perennial |
| Carex reznicekii | Cyperaceae | Tonys Sedge | CXREZN | native | 10 | 5 | sedge | perennial |
| Carex rosea | Cyperaceae | Stellate Sedge | CXROSE | native | 6 | 3 | sedge | perennial |
| Carex sartwellii | Cyperaceae | Sartwells Sedge | CXSART | native | 10 | -5 | sedge | perennial |
| Carex scabrata | Cyperaceae | Rough Sedge | CXSCAB | native | 10 | -5 | sedge | perennial |
| Carex schweinitzii | Cyperaceae | Schweinitzs Sedge | CXSCHW | native | 10 | -5 | sedge | perennial |
| Carex scoparia | Cyperaceae | Pointed Broom Sedge | CXSCOP | native | 5 | -3 | sedge | perennial |
| Carex shortiana | Cyperaceae | Shorts Sedge | CXSHOR | native | 4 | -3 | sedge | perennial |
| Carex socialis | Cyperaceae | Cespitose Sedge | CXSOCI | native | 10 | 5 | sedge | perennial |
| Carex sparganioides | Cyperaceae | Bur-Reed Sedge | CXSPAR | native | 5 | 0 | sedge | perennial |
| Carex sprengelii | Cyperaceae | Long-Beaked Sdge | CXSPRE | native | 10 | 0 | sedge | perennial |
| Carex squarrosa | Cyperaceae | Squarrose Sedge | CXSQUA | native | 6 | -3 | sedge | perennial |
| Carex sterilis | Cyperaceae | Dioecious Sedge | CXSTER | native | 10 | -5 | sedge | perennial |
| Carex stipata | Cyperaceae | Sawbeak Sedge | CXSTIP | native | 4 | -5 | sedge | perennial |
| Carex straminea | Cyperaceae | Straw Sedge | CXSTRA | native | 10 | -5 | sedge | perennial |
| Carex stricta | Cyperaceae | Tussock Sedge | CXSTRI | native | 10 | -5 | sedge | perennial |
| Carex suberecta | Cyperaceae | Prairie Straw Sedge | CXSUBE | native | 9 | -5 | sedge | perennial |
| Carex swanii | Cyperaceae | Savanna Sedge | CXSWAN | native | 7 | 3 | sedge | perennial |
| Carex sychnocephala | Cyperaceae | Many-Headed Sedge | CXSYCN | native | 10 | -3 | sedge | perennial |
| Carex tenera | Cyperaceae | Slender Sedge | CXTENE | native | 10 | -3 | sedge | perennial |
| Carex tetanica | Cyperaceae | Rigid Sedge | CXTETA | native | 10 | -3 | sedge | perennial |
| Carex texensis | Cyperaceae | Texas Sedge | CXTEXE | native | 3 | 5 | sedge | perennial |
| Carex timida | Cyperaceae | Timid Sedge | CXTIMI | native | 9 | 5 | sedge | perennial |
| Carex tonsa var. rugosperma | Cyperaceae | Wrinkle-Seeded Oak Sedge | CXTONR | native | 6 | 5 | sedge | perennial |
| Carex tonsa var. tonsa | Cyperaceae | Smooth-Fruited Oak Sedge | CXTONT | native | 10 | 5 | sedge | perennial |
| Carex torta | Cyperaceae | Twisted Sedge | CXTORT | native | 9 | -5 | sedge | perennial |
| Carex triangularis | Cyperaceae | Triangular Sedge | CXTRIA | native | 9 | -5 | sedge | perennial |
| Carex tribuloides var. sangamonensis | Cyperaceae | Awl-Fruited Oval Sedge | CXTRIS | native | 3 | -3 | sedge | perennial |
| Carex tribuloides var. tribuloides | Cyperaceae | Awl-Fruited Oval Sedge | CXTRIT | native | 3 | -3 | sedge | perennial |
| Carex trichocarpa | Cyperaceae | Hairy-Fruited Sedge | CXTRIC | native | 10 | -5 | sedge | perennial |
| Carex typhina | Cyperaceae | Cat-Tail Sedge | CXTYPH | native | 7 | -5 | sedge | perennial |
| Carex umbellata | Cyperaceae | Umbel-Like Sedge | CXUMBE | native | 6 | 5 | sedge | perennial |
| Carex vesicaria var. monile | Cyperaceae | Inflated Sedge | CXVESI | native | 9 | -5 | sedge | perennial |
| Carex virescens | Cyperaceae | Ribbed Sedge | CXVIRE | native | 7 | 3 | sedge | perennial |
| Carex vulpinoidea | Cyperaceae | Fox Sedge | CXVULP | native | 3 | -3 | sedge | perennial |
| Carex willdenowii | Cyperaceae | Willdenows Sedge | CXWILL | native | 10 | 3 | sedge | perennial |
| Carex woodii | Cyperaceae | Pretty Sedge | CXWOOD | native | 10 | 3 | sedge | perennial |
| Carex x deamii | Cyperaceae | Deams Sedge | CXDEAM | native | 8 | 5 | sedge | perennial |
| Carex x subimpressa | Cyperaceae | Impressed Sedge | CXSUBI | native | 10 | -5 | sedge | perennial |
| Carpinus caroliniana | Betulaceae | Blue Beech | CARPCA | native | 6 | 0 | tree | perennial |
| Carum carvi | Apiaceae | Caraway | CARUCA | non-native | 0 | 5 | forb | biennial |
| Carya aquatica | Juglandaceae | Water Hickory | CARAQU | native | 9 | -5 | tree | perennial |
| Carya cordiformis | Juglandaceae | Bitternut Hickory | CARCOR | native | 5 | 3 | tree | perennial |
| Carya glabra | Juglandaceae | Pignut Hickory | CARGLA | native | 6 | 5 | tree | perennial |
| Carya illinoinensis | Juglandaceae | Pecan | CARILL | native | 7 | 0 | tree | perennial |
| Carya laciniosa | Juglandaceae | Big Shellbark Hickory | CARLAC | native | 7 | -3 | tree | perennial |
| Carya ovalis | Juglandaceae | Red Hickory | CAROVL | native | 6 | 5 | tree | perennial |
| Carya ovata | Juglandaceae | Shagbark Hickory | CAROVT | native | 4 | 3 | tree | perennial |
| Carya pallida | Juglandaceae | Sand Hickory | CARPAL | native | 8 | 5 | tree | perennial |
| Carya texana | Juglandaceae | Black Hickory | CARTEX | native | 5 | 5 | tree | perennial |
| Carya tomentosa | Juglandaceae | Mockernut Hickory | CARTOM | native | 5 | 5 | tree | perennial |
| Castanea dentata | Fagaceae | Chestnut | CASDEN | non-native | 0 | 5 | tree | perennial |
| Castanea mollissima | Fagaceae | Chinese Chestnut | CASMOL | non-native | 0 | 5 | tree | perennial |
| Castanea pumila var. ozarkensis | Fagaceae | Ozark Chinquapin | CASPUO | native | 10 | 5 | tree | perennial |
| Castanea pumila var. pumila | Fagaceae | Chinquapin | CASPUP | native | 10 | 5 | tree | perennial |
| Castilleja coccinea | Orobanchaceae | Indian Paintbrush | CASCOC | native | 6 | 0 | forb | annual |
| Castilleja purpurea | Orobanchaceae | Purple Paintbrush | CASPUR | native | 10 | 5 | forb | perennial |
| Castilleja sessiliflora | Orobanchaceae | Downy Yellow Painted Cup | CASSES | native | 10 | 5 | forb | perennial |
| Catalpa bignonioides | Bignoniaceae | Catalpa | CATBIG | non-native | 0 | 3 | tree | perennial |
| Catalpa ovata | Bignoniaceae | Chinese Catalpa | CATOVA | non-native | 0 | 5 | tree | perennial |
| Catalpa speciosa | Bignoniaceae | Hardy Catalpa | CATSPE | native | 2 | 3 | tree | perennial |
| Caulophyllum thalictroides | Berberidaceae | Blue Cohosh | CAUTHA | native | 8 | 5 | forb | perennial |
| Cayaponia quinqueloba | Cucurbitaceae | Silva Manso | CAYQUI | native | 10 | 0 | forb | perennial |
| Ceanothus americanus | Rhamnaceae | New Jersey Tea | CEAAME | native | 7 | 5 | shrub | perennial |
| Ceanothus herbaceus | Rhamnaceae | Inland New Jersey Tea | CEAHER | native | 8 | 5 | shrub | perennial |
| Celastrus orbiculatus | Celastraceae | Oriental Bittersweet | CELORB | non-native | 0 | 5 | vine | perennial |
| Celastrus scandens | Celastraceae | Climbing Bittersweet | CELSCA | native | 3 | 3 | vine | perennial |
| Celosia argentea | Amaranthaceae | Cocks Comb | CELARG | non-native | 0 | 3 | forb | annual |
| Celtis laevigata | Ulmaceae | Sugarberry | CELLAE | native | 4 | -3 | tree | perennial |
| Celtis occidentalis | Ulmaceae | Hackberry | CELOCC | native | 3 | 3 | tree | perennial |
| Celtis pumila | Ulmaceae | Dwarf Hackberry | CELPUM | native | 6 | 5 | tree | perennial |
| Cenchrus ciliaris | Poaceae | Buffel Grass | CENCIL | non-native | 0 | 5 | grass | perennial |
| Cenchrus longispinus | Poaceae | Common Sandbur | CENLON | native | 0 | 5 | grass | annual |
| Cenchrus spinifex | Poaceae | Prairie Sandbur | CENSPI | native | 3 | 5 | grass | annual |
| Centaurea americana | Asteraceae | Basket Flower | CENAME | native | 6 | 5 | forb | annual |
| Centaurea cyanus | Asteraceae | Bachelors Button | CENCYA | non-native | 0 | 3 | forb | annual |
| Centaurea diffusa | Asteraceae | Spreading Star Thistle | CENDIF | non-native | 0 | 5 | forb | annual |
| Centaurea diluta | Asteraceae | Star Thistle | CENDIL | non-native | 0 | 5 | forb | annual |
| Centaurea melitensis | Asteraceae | Malta Star Thistle | CENMEL | non-native | 0 | 5 | forb | annual |
| Centaurea nigra | Asteraceae | Black Knapweed | CENNIA | non-native | 0 | 5 | forb | perennial |
| Centaurea nigrescens | Asteraceae | Tyrol Knapweed | CENNIS | non-native | 0 | 5 | forb | perennial |
| Centaurea repens | Asteraceae | Russian Knapweed | CENREP | non-native | 0 | 5 | forb | perennial |
| Centaurea solstitialis | Asteraceae | Yellow Star Thistle | CENSOL | non-native | 0 | 5 | forb | annual |
| Centaurea stoebe subsp. micranthos | Asteraceae | Spotted Knapweed | CENSTO | non-native | 0 | 5 | forb | perennial |
| Centrosema virginianum | Fabaceae | Spurred Butterfly Pea | CENVIR | native | 10 | 5 | forb | perennial |
| Cephalanthus occidentalis | Rubiaceae | Buttonbush | CEPOCC | native | 3 | -5 | shrub | perennial |
| Cerastium arvense subsp. strictum | Caryophyllaceae | Field Chickweed | CERARV | native | 10 | 3 | forb | perennial |
| Cerastium brachypetalum | Caryophyllaceae | Gray Chickweed | CERBRT | non-native | 0 | 5 | forb | annual |
| Cerastium brachypodum | Caryophyllaceae | Short-Stalked Chickweed | CERBRO | native | 3 | 3 | forb | annual |
| Cerastium diffusum | Caryophyllaceae | Four-Stamened Chickweed | CERDIF | non-native | 0 | 5 | forb | annual |
| Cerastium dubium | Caryophyllaceae | Doubtful Chickweed | CERDUB | non-native | 0 | 5 | forb | annual |
| Cerastium fontanum subsp. vulgare | Caryophyllaceae | Mouse-Ear Chickweed | CERFON | non-native | 0 | 3 | forb | perennial |
| Cerastium glomeratum | Caryophyllaceae | Clammy Chickweed | CERGLO | non-native | 0 | 5 | forb | annual |
| Cerastium nutans | Caryophyllaceae | Nodding Chickweed | CERNUT | native | 2 | 3 | forb | annual |
| Cerastium pumilum | Caryophyllaceae | Dwarf Chickweed | CERPUM | non-native | 0 | 5 | forb | annual |
| Cerastium semidecandrum | Caryophyllaceae | Small Mouse-Ear Chickweed | CERSEM | non-native | 0 | 5 | forb | annual |
| Cerastium velutinum | Caryophyllaceae | Showy Field Chickweed | CERVEL | native | 4 | 3 | forb | perennial |
| Ceratocephalus testiculatus | Ranunculaceae | Bur-Buttercup | CERTES | non-native | 0 | 5 | forb | annual |
| Ceratophyllum demersum | Ceratophyllaceae | Coontail | CERDEM | native | 5 | -5 | forb | perennial |
| Ceratophyllum echinatum | Ceratophyllaceae | Spiny Hornwort | CERECH | native | 9 | -5 | forb | perennial |
| Ceratostigma plumbaginoides | Plumbaginaceae | Plumbago | CERPLU | non-native | 0 | 5 | forb | perennial |
| Cercis canadensis | Fabaceae | Redbud | CERCAN | native | 3 | 3 | tree | perennial |
| Chaenomeles speciosa | Rosaceae | Flowering Quince | CHASPE | non-native | 0 | 5 | shrub | perennial |
| Chaenorrhinum minus | Plantaginaceae | Small Snapdragon | CHAMIN | non-native | 0 | 5 | forb | annual |
| Chaerophyllum procumbens | Apiaceae | Wild Chervil | CHAPRO | native | 2 | -3 | forb | annual |
| Chaerophyllum tainturieri | Apiaceae | Southern Chervil | CHATAI | native | 3 | 0 | forb | annual |
| Chaetopappa asteroides | Asteraceae | Least Daisy | CHAAST | native | 10 | 5 | forb | annual |
| Chamaecrista fasciculata | Fabaceae | Partridge Pea | CHAFAS | native | 2 | 3 | forb | annual |
| Chamaecrista nictitans | Fabaceae | Wild Sensitive Plant | CHANIC | native | 2 | 3 | forb | annual |
| Chasmanthium latifolium | Poaceae | Spike Grass | CHALAT | native | 4 | 0 | grass | perennial |
| Chasmanthium laxum | Poaceae | Slender Spike Grass | CHALAX | native | 10 | -3 | grass | perennial |
| Chasmanthium sessilifolium | Poaceae | Sessile-Flowered Spike Grass | CHASES | native | 10 | 0 | grass | perennial |
| Cheilanthes alabamensis | Pteridaceae | Alabama Lip-Fern | CHEALA | native | 10 | 5 | fern | perennial |
| Cheilanthes feei | Pteridaceae | Slender Lip Fern | CHEFEE | native | 8 | 5 | fern | perennial |
| Cheilanthes lanosa | Pteridaceae | Hairy Lip-Fern | CHELAN | native | 7 | 5 | fern | perennial |
| Cheilanthes tomentosa | Pteridaceae | Wooly-Lip-Fern | CHETOM | native | 10 | 5 | fern | perennial |
| Chelidonium majus | Papaveraceae | Celandine | CHEMAJ | non-native | 0 | 5 | forb | biennial |
| Chelone glabra | Plantaginaceae | Turtlehead | CHEGLB | native | 8 | -5 | forb | perennial |
| Chelone obliqua | Plantaginaceae | Pink Turtlehead | CHEOBL | native | 10 | -5 | forb | perennial |
| Chenopodium album | Chenopodiaceae | Lambs Quarters | CHEALB | non-native | 0 | 3 | forb | annual |
| Chenopodium ambrosioides | Chenopodiaceae | Mexican Tea | CHEAMB | non-native | 0 | 5 | forb | annual |
| Chenopodium berlandieri | Chenopodiaceae | Pitseed Goosefoot | CHEBER | native | 1 | 5 | forb | annual |
| Chenopodium botrys | Chenopodiaceae | Jerusalem Oak | CHEBOT | non-native | 0 | 5 | forb | annual |
| Chenopodium bushianum | Chenopodiaceae | Bushs Goosefoot | CHEBUS | native | 2 | 5 | forb | annual |
| Chenopodium capitatum | Chenopodiaceae | Strawberry Blite | CHECAP | non-native | 0 | 5 | forb | annual |
| Chenopodium desiccatum | Chenopodiaceae | Narrow-Leaved Goosefoot | CHEDES | non-native | 0 | 5 | forb | annual |
| Chenopodium ficifolium | Chenopodiaceae | Fig-Leaved Goosefoot | CHEFIC | non-native | 0 | 5 | forb | annual |
| Chenopodium glaucum | Chenopodiaceae | Oak-Leaved Goosefoot | CHEGLC | non-native | 0 | 0 | forb | annual |
| Chenopodium incanum | Chenopodiaceae | Hoary Goosefoot | CHEINC | non-native | 0 | 5 | forb | annual |
| Chenopodium missouriense | Chenopodiaceae | Missouri Goosefoot | CHEMIS | native | 1 | 3 | forb | annual |
| Chenopodium murale | Chenopodiaceae | Nettle-Leaved Goosefoot | CHEMUR | non-native | 0 | 3 | forb | annual |
| Chenopodium opulifolium | Chenopodiaceae | Broad-Leaved Lambs Quarters | CHEOPU | non-native | 0 | 5 | forb | annual |
| Chenopodium pallescens | Chenopodiaceae | Pale Goosefoot | CHEPAL | native | 2 | 5 | forb | annual |
| Chenopodium pratericola | Chenopodiaceae | Desert Goosefoot | CHEPRA | native | 0 | 5 | forb | annual |
| Chenopodium pumilio | Chenopodiaceae | Small Crumbweed | CHEPUM | non-native | 0 | 5 | forb | annual |
| Chenopodium rubrum | Chenopodiaceae | Red Goosefoot | CHERUB | non-native | 0 | -3 | forb | annual |
| Chenopodium simplex | Chenopodiaceae | Maple-Leaved Goosefoot | CHESIM | native | 2 | 5 | forb | annual |
| Chenopodium standleyanum | Chenopodiaceae | Woodland Goosefoot | CHESTA | native | 3 | 5 | forb | annual |
| Chenopodium strictum var. glaucophyllum | Chenopodiaceae | Late Goosefoot | CHESTR | native | 4 | 3 | forb | annual |
| Chenopodium urbicum | Chenopodiaceae | City Goosefoot | CHEURB | non-native | 0 | 5 | forb | annual |
| Chenopodium watsonii | Chenopodiaceae | Watsons Goosefoot | CHEWAT | non-native | 0 | 5 | forb | annual |
| Chionanthus virginicus | Oleaceae | Fringe Tree | CHIVIR | native | 10 | 3 | tree | perennial |
| Chloris verticillata | Poaceae | Windmill Grass | CHLVER | native | 0 | 5 | grass | perennial |
| Chloris virgata | Poaceae | Feather Finger Grass | CHLVIR | non-native | 0 | 3 | grass | annual |
| Chorispora tenella | Brassicaceae | Purple Rocket | CHOTEN | non-native | 0 | 5 | forb | annual |
| Cichorium intybus | Asteraceae | Chicory | CICINT | non-native | 0 | 3 | forb | perennial |
| Cicuta maculata | Apiaceae | Water Hemlock | CICMAC | native | 5 | -5 | forb | biennial |
| Cinna arundinacea | Poaceae | Common Wood Reed | CINARU | native | 7 | -3 | grass | perennial |
| Circaea canadensis | Onagraceae | Enchanters Nightshade | CIRCAD | native | 2 | 3 | forb | perennial |
| Cirsium altissimum | Asteraceae | Tall Thistle | CIRALT | native | 4 | 5 | forb | perennial |
| Cirsium arvense | Asteraceae | Canada Thistle | CIRARV | non-native | 0 | 3 | forb | perennial |
| Cirsium canescens | Asteraceae | Platte Thistle | CIRCAS | non-native | 0 | 5 | forb | biennial |
| Cirsium carolinianum | Asteraceae | Carolina Thistle | CIRCAR | native | 8 | 5 | forb | biennial |
| Cirsium discolor | Asteraceae | Field Thistle | CIRDIS | native | 3 | 5 | forb | perennial |
| Cirsium muticum | Asteraceae | Swamp Thistle | CIRMUT | native | 10 | -5 | forb | biennial |
| Cirsium texanum | Asteraceae | Texas Thistle | CIRTEX | non-native | 0 | 5 | forb | perennial |
| Cirsium undulatum | Asteraceae | Wavy-Leaved Thistle | CIRUND | native | 5 | 3 | forb | perennial |
| Cirsium vulgare | Asteraceae | Bull Thistle | CIRVUL | non-native | 0 | 3 | forb | biennial |
| Cissus trifoliata | Vitaceae | Marine Vine | CISTRI | native | 10 | 5 | vine | perennial |
| Citrullus lanatus | Cucurbitaceae | Watermelon | CITLAN | non-native | 0 | 3 | forb | annual |
| Citrus trifoliata | Rutaceae | Hardy Orange | CITTRI | non-native | 0 | 5 | shrub | perennial |
| Cladium mariscus subsp. jamaicense | Cyperaceae | Sawgrass | CLAMAR | non-native | 0 | -5 | sedge | perennial |
| Cladrastis kentukea | Fabaceae | Yellow Wood | CLAKEN | native | 10 | 5 | tree | perennial |
| Claytonia perfoliata | Portulacaceae | Miners Lettuce | CLAPER | non-native | 0 | 3 | forb | annual |
| Claytonia virginica | Portulacaceae | Spring Beauty | CLAVIR | native | 3 | 3 | forb | perennial |
| Clematis catesbyana | Ranunculaceae | Satincurls | CLECAT | native | 7 | 0 | vine | perennial |
| Clematis crispa | Ranunculaceae | Swamp Leather Flower | CLECRI | native | 8 | -3 | vine | perennial |
| Clematis fremontii | Ranunculaceae | Fremonts Leather Flower | CLEFRE | native | 10 | 5 | vine | perennial |
| Clematis pitcheri | Ranunculaceae | Leather Flower | CLEPIT | native | 6 | 3 | vine | perennial |
| Clematis terniflora | Ranunculaceae | Sweet Autumn Clematis | CLETER | non-native | 0 | 3 | vine | perennial |
| Clematis versicolor | Ranunculaceae | Small Leather Flower | CLEVER | native | 9 | 5 | vine | perennial |
| Clematis viorna | Ranunculaceae | Vase Vine | CLEVIO | native | 10 | 5 | vine | perennial |
| Clematis virginiana | Ranunculaceae | Virgins Bower | CLEVIR | native | 3 | 0 | vine | perennial |
| Cleome hassleriana | Cleomaceae | Spider Flower | CLEHAS | non-native | 0 | 5 | forb | annual |
| Cleome serrulata | Cleomaceae | Rocky Mountain Bee Plant | CLESER | native | 2 | 3 | forb | annual |
| Clinopodium acinos | Lamiaceae | Mother-Of-Thyme | CLIACI | non-native | 0 | 5 | forb | annual |
| Clinopodium arkansanum | Lamiaceae | Low Calamint | CLIARK | native | 7 | 0 | forb | perennial |
| Clitoria mariana | Fabaceae | Butterfly Pea | CLIMAR | native | 7 | 5 | forb | perennial |
| Cocculus carolinus | Menispermaceae | Carolina Snailseed | COCCAR | native | 5 | 0 | vine | perennial |
| Coeloglossum viride | Orchidaceae | Frog Orchid | COEVIR | native | 10 | 0 | forb | perennial |
| Coelorachis cylindrica | Poaceae | Joint Grass | COECYL | native | 9 | 3 | grass | perennial |
| Collinsia verna | Plantaginaceae | Blue-Eyed Mary | COLVER | native | 7 | 3 | forb | annual |
| Collinsia violacea | Plantaginaceae | Violet Collinsia | COLVIO | native | 8 | 5 | forb | annual |
| Collinsonia canadensis | Lamiaceae | Richweed | COLCAN | native | 9 | 0 | forb | perennial |
| Collomia linearis | Polemoniaceae | Slender Gilia | COLLIN | non-native | 0 | 5 | forb | annual |
| Comandra umbellata | Santalaceae | False Toadflax | COMUMB | native | 7 | 5 | forb | perennial |
| Commelina caroliniana | Commelinaceae | Carolina Dayflower | COMCAR | non-native | 0 | 0 | forb | annual |
| Commelina communis | Commelinaceae | Common Dayflower | COMCOM | non-native | 0 | 0 | forb | annual |
| Commelina diffusa | Commelinaceae | Creeping Dayflower | COMDIF | non-native | 0 | -3 | forb | annual |
| Commelina erecta | Commelinaceae | Narrow-Leaved Dayflower | COMERE | native | 4 | 3 | forb | perennial |
| Commelina virginica | Commelinaceae | Virginia Dayflower | COMVIR | native | 5 | -3 | forb | perennial |
| Conium maculatum | Apiaceae | Poison Hemlock | CONMAC | non-native | 0 | -3 | forb | biennial |
| Conoclinium coelestinum | Asteraceae | Mistflower | CONCOE | native | 3 | 0 | forb | perennial |
| Conringia orientalis | Brassicaceae | Hares Ear Mustard | CONORI | non-native | 0 | 5 | forb | annual |
| Convallaria majalis | Liliaceae | Lily Of The Valley | CONMAJ | non-native | 0 | 5 | forb | perennial |
| Convolvulus arvensis | Convolvulaceae | Field Bindweed | CONARV | non-native | 0 | 5 | forb | perennial |
| Conyza canadensis var. canadensis | Asteraceae | Horseweed | CONCAC | native | 0 | 3 | forb | annual |
| Conyza canadensis var. pusilla | Asteraceae | Small Canada Fleabane | CONCAP | native | 7 | 3 | forb | annual |
| Conyza ramosissima | Asteraceae | Dwarf Fleabane | CONRAM | native | 1 | 5 | forb | annual |
| Corallorhiza odontorhiza | Orchidaceae | Late Coral Root | CORODO | native | 6 | 5 | forb | perennial |
| Corallorhiza wisteriana | Orchidaceae | Wisters Coral Root | CORWIS | native | 7 | 3 | forb | perennial |
| Coreopsis grandiflora | Asteraceae | Large-Flowered Coreopsis | CORGRA | native | 6 | 5 | forb | perennial |
| Coreopsis lanceolata | Asteraceae | Sand Coreopsis | CORLAN | native | 5 | 5 | forb | perennial |
| Coreopsis palmata | Asteraceae | Prairie Coreopsis | CORPAL | native | 7 | 5 | forb | perennial |
| Coreopsis pubescens | Asteraceae | Star Tickseed | CORPUB | native | 7 | 3 | forb | perennial |
| Coreopsis tinctoria | Asteraceae | Golden Coreopsis | CORTIN | native | 1 | 0 | forb | annual |
| Coreopsis tripteris | Asteraceae | Tall Coreopsis | CORTRI | native | 6 | 0 | forb | perennial |
| Coriandrum sativum | Apiaceae | Coriander | CORSAT | non-native | 0 | 5 | forb | annual |
| Corispermum americanum | Chenopodiaceae | Small Bugseed | CORIAM | native | 5 | 3 | forb | annual |
| Corispermum pallassii | Chenopodiaceae | Common Bugseed | CORIPA | native | 5 | 5 | forb | annual |
| Corispermum villosum | Chenopodiaceae | Eastern Bugseed | CORIVI | native | 5 | 5 | forb | annual |
| Cornus alternifolia | Cornaceae | Pagoda Dogwood | CORALT | native | 8 | 0 | tree | perennial |
| Cornus amomum subsp. obliqua | Cornaceae | Pale Dogwood | CORAMO | native | 5 | -3 | shrub | perennial |
| Cornus drummondii | Cornaceae | Rough-Leaved Dogwood | CORDRU | native | 2 | 0 | shrub | perennial |
| Cornus florida | Cornaceae | Flowering Dogwood | CORFLO | native | 5 | 3 | tree | perennial |
| Cornus foemina subsp. foemina | Cornaceae | Stiff Dogwood | CORFOF | native | 6 | -3 | shrub | perennial |
| Cornus foemina subsp. racemosa | Cornaceae | Gray Dogwood | CORFOR | native | 3 | 0 | shrub | perennial |
| Corydalis aurea subsp. aurea | Fumariaceae | Golden Corydalis | CORAUA | native | 3 | 5 | forb | annual |
| Corydalis aurea subsp. occidentalis | Fumariaceae | Golden Corydalis | CORAUO | native | 5 | 5 | forb | biennial |
| Corydalis crystallina | Fumariaceae | Mealy Corydalis | CORCRY | native | 7 | 5 | forb | biennial |
| Corydalis flavula | Fumariaceae | Pale Corydalis | CORFLA | native | 3 | 3 | forb | biennial |
| Corydalis micrantha subsp. australis | Fumariaceae | Hales Corydalis | CORMIA | native | 10 | 5 | forb | biennial |
| Corydalis micrantha subsp. micrantha | Fumariaceae | Small-Flowered Corydalis | CORMIM | native | 4 | 5 | forb | biennial |
| Corylus americana | Betulaceae | American Hazelnut | CORYAM | native | 4 | 3 | shrub | perennial |
| Cosmos bipinnatus | Asteraceae | Common Cosmos | COSBIP | non-native | 0 | 3 | forb | annual |
| Cosmos parviflorus | Asteraceae | Small-Flowered Cosmos | COSPAR | non-native | 0 | 3 | forb | annual |
| Cosmos sulphureus | Asteraceae | Sulphur Cosmos | COSSUL | non-native | 0 | 5 | forb | annual |
| Cota tinctoria | Asteraceae | Yellow Chamomile | COTTIN | non-native | 0 | 5 | forb | perennial |
| Cotinus obovatus | Anacardiaceae | American Smoke Tree | COTOBO | native | 9 | 5 | tree | perennial |
| Cotoneaster acutifolius | Rosaceae | Peking Cotoneaster | COTACU | non-native | 0 | 5 | shrub | perennial |
| Crataegus berberifolia | Rosaceae | Barberry-Leaved Hawthorn | CRABER | native | 4 | 5 | tree | perennial |
| Crataegus biltmoreana | Rosaceae | Biltmore Hawthorn | CRABIL | native | 5 | 5 | tree | perennial |
| Crataegus calpodendron | Rosaceae | Sugar Hawthorn | CRACAL | native | 6 | 5 | tree | perennial |
| Crataegus coccinioides | Rosaceae | Kansas Hawthorn | CRACOC | native | 4 | 5 | tree | perennial |
| Crataegus collina | Rosaceae | Hillside Hawthorn | CRACOL | native | 4 | 5 | tree | perennial |
| Crataegus crus-galli | Rosaceae | Cockspur Hawthorn | CRACRU | native | 3 | 3 | tree | perennial |
| Crataegus fecunda | Rosaceae | Fruitful Hawthorn | CRAFEC | native | 3 | 5 | tree | perennial |
| Crataegus gattingeri | Rosaceae | Gatingers Hawthorn | CRAGAT | native | 5 | 5 | tree | perennial |
| Crataegus lanuginosa | Rosaceae | Woolly Hawthorn | CRALAN | native | 6 | 5 | tree | perennial |
| Crataegus macracantha | Rosaceae | Largethorn Hawthorn | CRAMAC | native | 4 | 5 | tree | perennial |
| Crataegus margarettae | Rosaceae | Margarets Hawthorn | CRAMAG | native | 3 | 5 | tree | perennial |
| Crataegus marshallii | Rosaceae | Parsley Hawthorn | CRAMAS | native | 9 | -3 | tree | perennial |
| Crataegus mollis | Rosaceae | Downy Hawthorn | CRAMOL | native | 4 | 3 | tree | perennial |
| Crataegus neobushii | Rosaceae | St. Clair Hawthorn | CRANEO | native | 5 | 5 | tree | perennial |
| Crataegus padifolia | Rosaceae | Bird-Cherry Hawthorn | CRAPAD | native | 7 | 5 | tree | perennial |
| Crataegus phaenopyrum | Rosaceae | Washington Thorn | CRAPHA | native | 5 | 0 | tree | perennial |
| Crataegus pruinosa | Rosaceae | Frosted Hawthorn | CRAPRU | native | 3 | 5 | tree | perennial |
| Crataegus reverchonii | Rosaceae | Reverchon Hawthorn | CRAREV | native | 4 | 5 | tree | perennial |
| Crataegus rubella | Rosaceae | Rosy Hawthorn | CRARUB | native | 6 | 5 | tree | perennial |
| Crataegus schuettei | Rosaceae | Schuette Hawthorn | CRASCH | native | 8 | 5 | tree | perennial |
| Crataegus sicca | Rosaceae | Smooth Hawthorn | CRASIC | native | 4 | 5 | tree | perennial |
| Crataegus spathulata | Rosaceae | Littlehip Hawthorn | CRASPA | native | 9 | 0 | tree | perennial |
| Crataegus succulenta | Rosaceae | Fleshy Hawthorn | CRASUC | native | 3 | 5 | tree | perennial |
| Crataegus texana | Rosaceae | Texas Red Hawthorn | CRATEX | native | 10 | 5 | tree | perennial |
| Crataegus uniflora | Rosaceae | One-Flower Hawthorn | CRAUNI | native | 7 | 5 | tree | perennial |
| Crataegus viridis | Rosaceae | Green Haw | CRAVIR | native | 5 | -3 | tree | perennial |
| Crepis capillaris | Asteraceae | Hawks Beard | CRECAP | non-native | 0 | 5 | forb | annual |
| Crepis pulchra | Asteraceae | Small-Flowered Hawks Beard | CREPUL | non-native | 0 | 5 | forb | biennial |
| Crepis setosa | Asteraceae | Bristly Hawks Beard | CRESET | non-native | 0 | 5 | forb | annual |
| Crepis tectorum | Asteraceae | Sand Rushfoil | CRETEC | non-native | 0 | 5 | forb | annual |
| Crotalaria sagittalis | Fabaceae | Rattlebox | CROSAG | native | 5 | 5 | forb | annual |
| Crotalaria spectabilis | Fabaceae | Showy Crotalaria | CROSPE | non-native | 0 | 3 | forb | annual |
| Croton capitatus var. capitatus | Euphorbiaceae | Hogwort | CROCAC | native | 0 | 5 | forb | annual |
| Croton capitatus var. lindheimeri | Euphorbiaceae | Woolly Croton | CROCAL | native | 2 | 5 | forb | annual |
| Croton glandulosus var. septentrionalis | Euphorbiaceae | Sand Croton | CROGLA | native | 1 | 5 | forb | annual |
| Croton lindheimerianus | Euphorbiaceae | Lindheimers Croton | CROLIN | non-native | 0 | 5 | forb | annual |
| Croton michauxii | Euphorbiaceae | Slender Rushfoil | CROMIC | native | 8 | 5 | forb | annual |
| Croton monanthogynus | Euphorbiaceae | Prairie Tea | CROMON | native | 2 | 5 | forb | annual |
| Croton texensis | Euphorbiaceae | Skunk Weed | CROTEX | non-native | 0 | 5 | forb | annual |
| Croton wildenowii | Euphorbiaceae | Common Rushfoil | CROWIL | native | 4 | 5 | forb | annual |
| Crypsis schoenoides | Poaceae | False Timothy | CRYSCH | non-native | 0 | 3 | grass | annual |
| Cryptotaenia canadensis | Apiaceae | Honewort | CRYCAN | native | 2 | 0 | forb | perennial |
| Cubelium concolor | Violaceae | Green Violet | CUBCON | native | 7 | 3 | forb | perennial |
| Cucumis melo | Cucurbitaceae | Muskmelon | CUCMEL | non-native | 0 | 5 | forb | annual |
| Cucumis sativus | Cucurbitaceae | Cucumber | CUCSAT | non-native | 0 | 5 | forb | annual |
| Cucurbita foetidissima | Cucurbitaceae | Missouri Gourd | CUCFOE | non-native | 0 | 5 | forb | perennial |
| Cucurbita pepo var. ovifera | Cucurbitaceae | Ornamental Gourd | CUCPOV | non-native | 0 | 5 | forb | annual |
| Cucurbita pepo var. ozarkana | Cucurbitaceae | Yellow-Flowered Gourd | CUCPOZ | native | 2 | 5 | forb | annual |
| Cunila origanoides | Lamiaceae | Dittany | CUNORI | native | 6 | 5 | forb | perennial |
| Cuphea viscosissima | Lythraceae | Waxweed | CUPVIS | native | 4 | 0 | forb | annual |
| Cuscuta campestris | Convolvulaceae | Prairie Dodder | CUSCAM | native | 4 | 5 | forb | annual |
| Cuscuta cephalanthi | Convolvulaceae | Buttonbush Dodder | CUSCEP | native | 6 | 5 | forb | annual |
| Cuscuta compacta | Convolvulaceae | Compact Dodder | CUSCOM | native | 7 | 5 | forb | annual |
| Cuscuta coryli | Convolvulaceae | Hazel Dodder | CUSCOR | native | 7 | 5 | forb | annual |
| Cuscuta cuspidata | Convolvulaceae | Cusp Dodder | CUSCUS | native | 5 | -3 | forb | annual |
| Cuscuta glomerata | Convolvulaceae | Rope Dodder | CUSGLO | native | 5 | 0 | forb | annual |
| Cuscuta gronovii | Convolvulaceae | Common Dodder | CUSGRO | native | 3 | 0 | forb | annual |
| Cuscuta indecora | Convolvulaceae | Large Alfalfa Dodder | CUSIND | native | 2 | 0 | forb | annual |
| Cuscuta obtusiflora var. glandulosa | Convolvulaceae | Peruvian Dodder | CUSOBT | native | 8 | 5 | forb | perennial |
| Cuscuta pentagona | Convolvulaceae | Field Dodder | CUSPEN | native | 5 | 5 | forb | annual |
| Cuscuta polygonorum | Convolvulaceae | Knotweed Dodder | CUSPOL | native | 7 | -3 | forb | annual |
| Cyclachaena xanthifolia | Asteraceae | Burweed Marsh Elder | CYCXAN | native | 0 | 0 | forb | annual |
| Cycloloma atriplicifolium | Chenopodiaceae | Winged Pigweed | CYCATR | native | 4 | 3 | forb | annual |
| Cylindropuntia imbricata | Cactaceae | Tree Cholla | CYLIMB | non-native | 0 | 5 | shrub | perennial |
| Cymbalaria muralis | Plantaginaceae | Kenilworth Ivy | CYMMUR | non-native | 0 | 5 | forb | perennial |
| Cynanchum laeve | Asclepiadaceae | Bluevine | CYNLAE | native | 0 | 0 | forb | perennial |
| Cynanchum louiseae | Asclepiadaceae | Black Swallowwort | CYNLOU | non-native | 0 | 5 | forb | perennial |
| Cynodon dactylon | Poaceae | Bermuda Grass | CYNDAC | non-native | 0 | 3 | grass | perennial |
| Cynoglossum creticum | Boraginaceae | Blue Hounds Tongue | CYNCRE | non-native | 0 | 5 | forb | annual |
| Cynoglossum officinale | Boraginaceae | Common Hounds Tongue | CYNOFF | non-native | 0 | 5 | forb | biennial |
| Cynoglossum virginianum | Boraginaceae | Wild Comfrey | CYNVIR | native | 6 | 5 | forb | perennial |
| Cynosciadium digitatum | Apiaceae | Pinnate Dog-Celery | CYNDIG | native | 7 | -3 | forb | annual |
| Cynosurus echinatus | Poaceae | Dogs Tail Grass | CYNECH | non-native | 0 | 5 | grass | annual |
| Cyperus acuminatus | Cyperaceae | Short-Pointed Cyperus | CYPACU | native | 3 | -5 | sedge | annual |
| Cyperus bipartitus | Cyperaceae | Brook Sedge | CYPBIP | native | 6 | -3 | sedge | annual |
| Cyperus compressus | Cyperaceae | Coco Grass | CYPCOM | native | 0 | -3 | sedge | annual |
| Cyperus croceus | Cyperaceae | Bladwin Flatsedge | CYPCRO | native | 10 | 0 | sedge | perennial |
| Cyperus diandrus | Cyperaceae | Umbrella Flatsedge | CYPDIA | native | 6 | -3 | sedge | annual |
| Cyperus difformis | Cyperaceae | Variable Flatsedge | CYPDIF | non-native | 0 | -5 | sedge | annual |
| Cyperus echinatus | Cyperaceae | Ball Sedge | CYPECH | native | 3 | 0 | sedge | perennial |
| Cyperus erythrorhizos | Cyperaceae | Red-Rooted Sedge | CYPERY | native | 2 | -3 | sedge | annual |
| Cyperus esculentus | Cyperaceae | Chufa | CYPESC | native | 0 | -3 | sedge | perennial |
| Cyperus flavescens var. poiformis | Cyperaceae | Yellow Flatsedge | CYPFLN | native | 5 | -5 | sedge | annual |
| Cyperus flavicomis | Cyperaceae | White-Edged Cyperus | CYPFLC | non-native | 0 | 0 | sedge | annual |
| Cyperus fuscus | Cyperaceae | Brown Flatsedge | CYPFUS | non-native | 0 | 0 | sedge | annual |
| Cyperus grayoides | Cyperaceae | Illinois Flatsedge | CYPGRA | native | 9 | 5 | sedge | perennial |
| Cyperus hystricinus | Cyperaceae | Bristly Flatsedge | CYPHYS | native | 9 | 5 | sedge | perennial |
| Cyperus iria | Cyperaceae | Iria Flatsedge | CYPIRI | non-native | 0 | -3 | sedge | annual |
| Cyperus lancastriensis | Cyperaceae | Many-Flowered Flatsedge | CYPLAN | native | 5 | 0 | sedge | perennial |
| Cyperus lupulinus subsp. lupulinus | Cyperaceae | Slender Flatsedge | CYPLUL | native | 4 | 3 | sedge | perennial |
| Cyperus lupulinus subsp. macilentus | Cyperaceae | Slender Flatsedge | CYPLUM | native | 4 | 3 | sedge | perennial |
| Cyperus odoratus | Cyperaceae | Fragrant Flatsedge | CYPODO | native | 3 | -3 | sedge | annual |
| Cyperus plukenettii | Cyperaceae | Plunkenets Cyperus | CYPPLU | native | 10 | 5 | sedge | perennial |
| Cyperus polystachyos var. texensis | Cyperaceae | Many-Spike Flatsedge | CYPPOL | native | 8 | -3 | sedge | annual |
| Cyperus pseudovegetus | Cyperaceae | Green Flatsedge | CYPPSE | native | 5 | -3 | sedge | perennial |
| Cyperus refractus | Cyperaceae | Reflexed Flatsedge | CYPREF | native | 6 | 3 | sedge | perennial |
| Cyperus retroflexus | Cyperaceae | One-Flowered Flatsedge | CYPREX | native | 6 | 5 | sedge | perennial |
| Cyperus retrofractus | Cyperaceae | Rough Flatsedge | CYPREC | native | 8 | 3 | sedge | perennial |
| Cyperus retrorsus | Cyperaceae | Pine Barrens Flatsedge | CYPRER | non-native | 0 | 0 | sedge | perennial |
| Cyperus rotundus | Cyperaceae | Nut Grass | CYPROT | non-native | 0 | 0 | sedge | perennial |
| Cyperus schweinitzii | Cyperaceae | Rough Sand Flatsedge | CYPSCH | native | 7 | 3 | sedge | perennial |
| Cyperus setigerus | Cyperaceae | Leon Flatsedge | CYPSET | native | 5 | 0 | sedge | perennial |
| Cyperus squarrosus | Cyperaceae | Awned Flatsedge | CYPSQU | native | 3 | -5 | sedge | annual |
| Cyperus strigosus | Cyperaceae | Straw-Colored Flatsedge | CYPSTR | native | 1 | -3 | sedge | perennial |
| Cypripedium calceolus var. parviflorum | Orchidaceae | Small Yellow Ladys Slipper | CYPPAR | native | 8 | -3 | forb | perennial |
| Cypripedium calceolus var. pubescens | Orchidaceae | Large Yellow Ladys Slipper | CYPPUB | native | 8 | 0 | forb | perennial |
| Cypripedium candidum | Orchidaceae | White Ladys Slipper | CYPCAN | native | 10 | -5 | forb | perennial |
| Cypripedium reginae | Orchidaceae | Showy Ladys Slipper | CYPREG | native | 10 | -3 | forb | perennial |
| Cystopteris bulbifera | Dryopteridaceae | Bulblet Fern | CYSBUL | native | 8 | 0 | fern | perennial |
| Cystopteris protrusa | Dryopteridaceae | Southern Fern | CYSPRO | native | 5 | 0 | fern | perennial |
| Cystopteris tennesseensis | Dryopteridaceae | Tennessee Bladder Fern | CYSTES | native | 8 | 5 | fern | perennial |
| Cystopteris tenuis | Dryopteridaceae | Fragile Fern | CYSTEU | native | 10 | 5 | fern | perennial |
| Dactylis glomerata | Poaceae | Orchard Grass | DACGLO | non-native | 0 | 3 | grass | perennial |
| Dalea candida | Fabaceae | White Prairie Clover | DALCAN | native | 8 | 5 | forb | perennial |
| Dalea enneandra | Fabaceae | Nine-Anthered Prairie Clover | DALENN | native | 10 | 5 | forb | perennial |
| Dalea gattingeri | Fabaceae | Glade Prairie Clover | DALGAT | native | 10 | 5 | forb | perennial |
| Dalea leporina | Fabaceae | Foxtail Dalea | DALLEP | native | 7 | 5 | forb | annual |
| Dalea multiflora | Fabaceae | Round-Headed Prairie Clover | DALMUL | native | 10 | 5 | forb | perennial |
| Dalea purpurea | Fabaceae | Purple Prairie Clover | DALPUR | native | 8 | 5 | forb | perennial |
| Dalea villosa | Fabaceae | Silky Prairie Clover | DALVIL | non-native | 0 | 5 | forb | perennial |
| Danthonia spicata | Poaceae | Poverty Oat Grass | DANSPI | native | 3 | 5 | grass | perennial |
| Dasistoma macrophyllum | Orobanchaceae | Mullein Foxglove | DASMAC | native | 5 | 3 | forb | perennial |
| Datura inoxia | Solanaceae | Angels Trumpet | DATINO | non-native | 0 | 5 | forb | annual |
| Datura stramonium | Solanaceae | Jimson Weed | DATSTR | non-native | 0 | 5 | forb | annual |
| Datura wrightii | Solanaceae | Sacred Thorn-Apple | DATWRI | non-native | 0 | 5 | forb | annual |
| Daucus carota | Apiaceae | Queen Annes Lace | DAUCAR | non-native | 0 | 5 | forb | biennial |
| Daucus pusillus | Apiaceae | Small Wild Carrot | DAUPUS | native | 4 | 5 | forb | biennial |
| Decodon verticillatus | Lythraceae | Swamp Loosestrife | DECVER | native | 10 | -5 | shrub | perennial |
| Delphinium ajacis | Ranunculaceae | Rocket Larkspur | DELAJA | non-native | 0 | 5 | forb | annual |
| Delphinium carolinianum subsp. carolinianum | Ranunculaceae | Carolina Larkspur | DELCAC | native | 7 | 5 | forb | perennial |
| Delphinium carolinianum subsp. virescens | Ranunculaceae | Prairie Larkspur | DELCAV | native | 6 | 5 | forb | perennial |
| Delphinium consolida | Ranunculaceae | Forking Larkspur | DELCON | non-native | 0 | 5 | forb | annual |
| Delphinium exaltatum | Ranunculaceae | Tall Larkspur | DELEXA | native | 10 | 5 | forb | perennial |
| Delphinium treleasei | Ranunculaceae | Treleases Larkspur | DELTRE | native | 10 | 5 | forb | perennial |
| Delphinium tricorne | Ranunculaceae | Dwarf Larkspur | DELTRI | native | 6 | 5 | forb | perennial |
| Dennstaedtia punctilobula | Dennstaedtiaceae | Hay-Scented Fern | DENPUN | native | 10 | 5 | fern | perennial |
| Deparia acrostichoides | Dryopteridaceae | Silvery Spleenwort | DEPACR | native | 10 | 0 | fern | perennial |
| Descurainia pinnata subsp. brachycarpa | Brassicaceae | Green Tansy Mustard | DESPIB | native | 2 | 5 | forb | annual |
| Descurainia pinnata subsp. pinnata | Brassicaceae | Gray Tansy Mustard | DESPIP | native | 6 | 5 | forb | annual |
| Descurainia sophia | Brassicaceae | Flixweed | DESSOP | non-native | 0 | 5 | forb | annual |
| Desmanthus illinoensis | Fabaceae | Illinois Bundle Flower | DESAIL | native | 3 | 3 | forb | perennial |
| Desmanthus leptolobus | Fabaceae | Creeping Bundle Flower | DESLEP | non-native | 0 | 5 | forb | perennial |
| Desmodium canadense | Fabaceae | Showy Tick Trefoil | DESCAD | native | 4 | 3 | forb | perennial |
| Desmodium canescens | Fabaceae | Hoary Tick Trefoil | DESCAS | native | 5 | 5 | forb | perennial |
| Desmodium ciliare | Fabaceae | Hairy Tick Trefoil | DESCIL | native | 5 | 5 | forb | perennial |
| Desmodium cuspidatum | Fabaceae | Bracted Tick Trefoil | DESCUS | native | 5 | 5 | forb | perennial |
| Desmodium glabellum | Fabaceae | Dillenis Tick Trefoil | DESGLA | native | 3 | 5 | forb | perennial |
| Desmodium illinoense | Fabaceae | Illinois Tick Trefoil | DESOIL | native | 6 | 5 | forb | perennial |
| Desmodium laevigatum | Fabaceae | Smooth Tick Trefoil | DESLAE | native | 7 | 5 | forb | perennial |
| Desmodium marilandicum | Fabaceae | Small-Leaved Tick Trefoil | DESMAR | native | 5 | 5 | forb | perennial |
| Desmodium nuttallii | Fabaceae | Nuttalls Tick Trefoil | DESNUT | native | 7 | 5 | forb | perennial |
| Desmodium obtusum | Fabaceae | Stiff Tick Trefoil | DESOBT | native | 6 | 5 | forb | perennial |
| Desmodium ochroleucum | Fabaceae | Cream-Flowered Tick Trefoil | DESOCH | native | 10 | 5 | forb | perennial |
| Desmodium paniculatum | Fabaceae | Panicled Tick Trefoil | DESPAN | native | 3 | 3 | forb | perennial |
| Desmodium perplexum | Fabaceae | Confusing Trefoil | DESPER | native | 3 | 5 | forb | perennial |
| Desmodium rotundifolium | Fabaceae | Round-Leaved Tick Trefoil | DESROT | native | 6 | 5 | forb | perennial |
| Desmodium sessilifolium | Fabaceae | Sessile-Leaved Tick Trefoil | DESSES | native | 5 | 5 | forb | perennial |
| Desmodium strictum | Fabaceae | Sand Tick Trefoil | DESSTR | native | 10 | 5 | forb | perennial |
| Desmodium viridiflorum | Fabaceae | Velvetleaf Tick Trefoil | DESVIR | native | 10 | 5 | forb | perennial |
| Desmodium x humifusum | Fabaceae | Trailing Tick Trefoil | DESHUM | native | 8 | 5 | forb | perennial |
| Dianthus armeria | Caryophyllaceae | Deptford Pink | DIAARM | non-native | 0 | 5 | forb | annual |
| Dianthus barbatus | Caryophyllaceae | Sweet William | DIABAR | non-native | 0 | 5 | forb | perennial |
| Dianthus deltoides | Caryophyllaceae | Maiden Pink | DIADEL | non-native | 0 | 5 | forb | perennial |
| Dianthus plumarius | Caryophyllaceae | Garden Pink | DIAPLU | non-native | 0 | 5 | forb | perennial |
| Diaperia prolifera | Asteraceae | Pygmy Cudweed | DIAPRO | non-native | 0 | 5 | forb | annual |
| Diarrhena americana | Poaceae | American Beak Grass | DIAAME | native | 9 | 3 | grass | perennial |
| Diarrhena obovata | Poaceae | Obovate Beak Grass | DIAOBO | native | 6 | 3 | grass | perennial |
| Dicentra canadensis | Fumariaceae | Squirrel Corn | DICCAN | native | 9 | 5 | forb | perennial |
| Dicentra cucullaria | Fumariaceae | Dutchmans Breeches | DICCUC | native | 6 | 5 | forb | perennial |
| Dichanthelium angustifolium | Poaceae | Needle-Leaved Panic Grass | DICANG | native | 7 | 3 | grass | perennial |
| Dichanthelium annulum | Poaceae | Ringed Panic Grass | DICANN | native | 10 | 0 | grass | perennial |
| Dichanthelium ashei | Poaceae | Ashes Panic Grass | DICASH | native | 7 | 3 | grass | perennial |
| Dichanthelium bicknellii | Poaceae | Bicknells Panic Grass | DICBIC | native | 6 | 3 | grass | perennial |
| Dichanthelium boscii | Poaceae | Boscs Panic Grass | DICBOS | native | 5 | 5 | grass | perennial |
| Dichanthelium clandestinum | Poaceae | Deer Tongue Grass | DICCLA | native | 4 | -3 | grass | perennial |
| Dichanthelium columbianum | Poaceae | Hemlock Panic Grass | DICCOL | native | 8 | 3 | grass | perennial |
| Dichanthelium commonsianum | Poaceae | Commons Panic Grass | DICCOS | native | 8 | 3 | grass | perennial |
| Dichanthelium commutatum var. commutatum | Poaceae | Variable Panic Grass | DICCOM | native | 7 | 3 | grass | perennial |
| Dichanthelium depauperatum | Poaceae | Starved Panic Grass | DICDEP | native | 4 | 5 | grass | perennial |
| Dichanthelium dichotomum var. barbulatum | Poaceae | Forked Panic Grass | DICDIB | native | 6 | 5 | grass | perennial |
| Dichanthelium dichotomum var. dichotomum | Poaceae | Forked Panic Grass | DICDID | native | 8 | 5 | grass | perennial |
| Dichanthelium dichotomum var. yadkinense | Poaceae | Yadkin Panic Grass | DICDIY | native | 10 | 0 | grass | perennial |
| Dichanthelium implicatum | Poaceae | Hairy Panic Grass | DICIMP | native | 7 | 0 | grass | perennial |
| Dichanthelium joorii | Poaceae | Joors Panic Grass | DICJOO | native | 7 | 3 | grass | perennial |
| Dichanthelium lanuginosum | Poaceae | Wooly Panic Grass | DICLAN | native | 2 | 3 | grass | perennial |
| Dichanthelium latifolium | Poaceae | Broad-Leaved Panic Grass | DICLAT | native | 7 | 3 | grass | perennial |
| Dichanthelium laxiflorum | Poaceae | Lax-Flowered Panic Grass | DICLAX | native | 6 | 3 | grass | perennial |
| Dichanthelium leibergii | Poaceae | Prairie Panic Grass | DICLEI | native | 10 | 3 | grass | perennial |
| Dichanthelium lindheimeri | Poaceae | Lindheimers Panic Grass | DICLID | native | 3 | 0 | grass | perennial |
| Dichanthelium linearifolium var. linearifolium | Poaceae | Slender-Leaved Panic Grass | DICLIL | native | 5 | 5 | grass | perennial |
| Dichanthelium longiligulatum | Poaceae | Coastal Plain Panic Grass | DICLON | native | 4 | 5 | grass | perennial |
| Dichanthelium malacophyllum | Poaceae | Soft-Leaved Panic Grass | DICMAL | native | 5 | 5 | grass | perennial |
| Dichanthelium microcarpon | Poaceae | Small-Fruited Panic Grass | DICMIC | native | 7 | 0 | grass | perennial |
| Dichanthelium nitidum | Poaceae | Shining Panic Grass | DICNIT | native | 10 | 0 | grass | perennial |
| Dichanthelium oligosanthes var. oligosanthes | Poaceae | Few-Flowered Panic Grass | DICOLO | native | 6 | 3 | grass | perennial |
| Dichanthelium oligosanthes var. scribnerianum | Poaceae | Scribners Panic Grass | DICOLS | native | 4 | 3 | grass | perennial |
| Dichanthelium perlongum | Poaceae | Long-Stalked Panic Grass | DICPER | native | 9 | 5 | grass | perennial |
| Dichanthelium polyanthes | Poaceae | Many-Flowered Panic Grass | DICPOL | native | 6 | 3 | grass | perennial |
| Dichanthelium praecocius | Poaceae | Early-Branching Panic Grass | DICPRA | native | 9 | 5 | grass | perennial |
| Dichanthelium ravenelii | Poaceae | Ravenels Panic Grass | DICRAV | native | 7 | 3 | grass | perennial |
| Dichanthelium scoparium | Poaceae | Velvety Panic Grass | DICSCO | native | 6 | -3 | grass | perennial |
| Dichanthelium sphaerocarpon | Poaceae | Round-Fruited Panic Grass | DICSPH | native | 5 | 3 | grass | perennial |
| Dichanthelium villosissimum | Poaceae | White-Haired Panic Grass | DICVIL | native | 6 | 5 | grass | perennial |
| Dichanthelium werneri | Poaceae | Werners Panic Grass | DICWER | native | 7 | 5 | grass | perennial |
| Dichelostemma congestum | Liliaceae | Garden Bluebells | DICCON | non-native | 0 | 5 | forb | perennial |
| Dichondra carolinensis | Convolvulaceae | Carolina Ponyfoot | DICCAR | non-native | 0 | 0 | forb | perennial |
| Dicliptera brachiata | Acanthaceae | Wild Mudwort | DICBRA | native | 6 | -3 | forb | annual |
| Dictamnus albus | Rutaceae | Gas Plant | DICALB | non-native | 0 | 5 | forb | perennial |
| Didiplis diandra | Lythraceae | Water Purslane | DIDDIA | native | 7 | -5 | forb | perennial |
| Digitaria ciliaris | Poaceae | Southern Crab Grass | DIGCIL | non-native | 0 | 3 | grass | annual |
| Digitaria cognata | Poaceae | Fall Witch Grass | DIGCOG | native | 3 | 5 | grass | perennial |
| Digitaria filiformis | Poaceae | Slender Crab Grass | DIGFIL | native | 3 | 5 | grass | annual |
| Digitaria ischaemum | Poaceae | Smooth Crab Grass | DIGISC | non-native | 0 | 3 | grass | annual |
| Digitaria sanguinalis | Poaceae | Hairy Crab Grass | DIGSAN | non-native | 0 | 3 | grass | annual |
| Digitaria violascens | Poaceae | Violet Crab Grass | DIGVIO | non-native | 0 | 5 | grass | annual |
| Diodia teres | Rubiaceae | Buttonweed | DIODTE | native | 2 | 5 | forb | annual |
| Diodia virginiana | Rubiaceae | Large Buttonweed | DIODVI | native | 5 | -3 | forb | perennial |
| Dioscorea oppositifolia | Dioscoreaceae | Chinese Yam | DIOOPP | non-native | 0 | 5 | forb | perennial |
| Dioscorea quaternata | Dioscoreaceae | Four-Leaf Yam | DIOQUA | native | 5 | 5 | forb | perennial |
| Dioscorea villosa | Dioscoreaceae | Wild Yam | DIOVIL | native | 5 | 0 | forb | perennial |
| Diospyros virginiana | Ebenaceae | Persimmon | DIOSVI | native | 3 | 0 | tree | perennial |
| Diplazium pycnocarpon | Dryopteridaceae | Narrow-Leaved Spleenwort | DIPPYC | native | 10 | 0 | fern | perennial |
| Diplotaxis muralis | Brassicaceae | Wall Rocket | DIPMUR | non-native | 0 | 5 | forb | annual |
| Dipsacus fullonum | Dipsacaceae | Common Teasel | DIPFUL | non-native | 0 | 3 | forb | biennial |
| Dipsacus laciniatus | Dipsacaceae | Cut-Leaved Teasel | DIPLAC | non-native | 0 | 3 | forb | biennial |
| Dirca palustris | Thymelaeaceae | Leatherwood | DIRPAL | native | 8 | 0 | shrub | perennial |
| Distichlis spicata var. spicata | Poaceae | Seashore Salt Grass | DISSPP | native | 10 | -3 | grass | perennial |
| Distichlis spicata var. stricta | Poaceae | Inland Salt Grass | DISSPT | non-native | 0 | 3 | grass | perennial |
| Doellingeria umbellata var. pubens | Asteraceae | Flat-Top Aster | DOEUMB | native | 10 | -3 | forb | perennial |
| Draba aprica | Brassicaceae | Whitlow Grass | DRAAPR | native | 10 | 5 | forb | annual |
| Draba brachycarpa | Brassicaceae | Short-Fruited Whitlow Grass | DRABRA | native | 0 | 5 | forb | annual |
| Draba cuneifolia | Brassicaceae | Wedgeleaf Draba | DRACUN | native | 5 | 5 | forb | annual |
| Draba reptans | Brassicaceae | Common Whitlow Grass | DRAREP | native | 2 | 5 | forb | annual |
| Draba verna | Brassicaceae | Vernal Whitlow Grass | DRAVER | non-native | 0 | 5 | forb | annual |
| Dracocephalum parviflorum | Lamiaceae | American Dragonhead | DRAPAR | non-native | 0 | 3 | forb | annual |
| Drymocallis arguta | Rosaceae | Prairie Cinquefoil | DRYARG | native | 10 | 5 | forb | perennial |
| Dryopteris carthusiana | Dryopteridaceae | Spinulose Shield Fern | DRYCAR | native | 10 | -3 | fern | perennial |
| Dryopteris celsa | Dryopteridaceae | Log Fern | DRYCEL | native | 10 | -3 | fern | perennial |
| Dryopteris cristata | Dryopteridaceae | Crested Shield Fern | DRYCRI | native | 10 | -5 | fern | perennial |
| Dryopteris goldiana | Dryopteridaceae | Goldie Fern | DRYGOL | native | 9 | 0 | fern | perennial |
| Dryopteris intermedia | Dryopteridaceae | Intermediate Shield Fern | DRYINT | native | 10 | 3 | fern | perennial |
| Dryopteris marginalis | Dryopteridaceae | Marginal Shield Fern | DRYMAR | native | 7 | 3 | fern | perennial |
| Duchesnea indica | Rosaceae | Indian Strawberry | DUCIND | non-native | 0 | 3 | forb | perennial |
| Dulichium arundinaceum | Cyperaceae | Pond Sedge | DULARU | native | 9 | -5 | sedge | perennial |
| Dyssodia papposa | Asteraceae | Fetid Marigold | DYSPAP | native | 1 | 5 | forb | annual |
| Echinacea angustifolia | Asteraceae | Narrow-Leafed Coneflower | ECHANG | native | 8 | 5 | forb | perennial |
| Echinacea pallida | Asteraceae | Pale Purple Coneflower | ECHPAL | native | 7 | 5 | forb | perennial |
| Echinacea paradoxa | Asteraceae | Yellow Coneflower | ECHPAR | native | 9 | 5 | forb | perennial |
| Echinacea purpurea | Asteraceae | Purple Coneflower | ECHPUR | native | 5 | 5 | forb | perennial |
| Echinacea simulata | Asteraceae | Glade Purple Coneflower | ECHSIM | native | 7 | 5 | forb | perennial |
| Echinochloa colonum | Poaceae | Jungle Rice | ECHCOL | non-native | 0 | -3 | grass | annual |
| Echinochloa crusgalli | Poaceae | Barnyard Grass | ECHCRG | non-native | 0 | 0 | grass | annual |
| Echinochloa crus-pavonis var. macera | Poaceae | Gulf Cockspur Grass | ECHCRP | non-native | 0 | -5 | grass | annual |
| Echinochloa muricata | Poaceae | Cockspur Grass | ECHMUR | native | 2 | -5 | grass | annual |
| Echinochloa walteri | Poaceae | Marsh Cockspur Grass | ECHWAL | native | 7 | -5 | grass | annual |
| Echinocystis lobata | Cucurbitaceae | Wild Cucumber | ECHLOB | native | 5 | 0 | forb | annual |
| Echinodorus berteroi | Alismataceae | Upright Burhead | ECHBER | native | 8 | -5 | forb | annual |
| Echinodorus cordifolius | Alismataceae | Creeping Burhead | ECHCOR | native | 8 | -5 | forb | perennial |
| Echinodorus tenellus | Alismataceae | Dwarf Burhead | ECHTEN | native | 9 | -5 | forb | annual |
| Echium vulgare | Boraginaceae | Blueweed | ECHVUL | non-native | 0 | 5 | forb | biennial |
| Eclipta prostrata | Asteraceae | Yerba De Tajo | ECLPRO | native | 3 | -3 | forb | annual |
| Egeria densa | Hydrocharitaceae | Brazilian Waterweed | EGEDEN | non-native | 0 | -5 | forb | perennial |
| Eichhornia crassipes | Pontederiaceae | Water Hyacinth | EICCRA | non-native | 0 | -5 | forb | perennial |
| Elaeagnus angustifolia | Elaeagnaceae | Russian Olive | ELAANG | non-native | 0 | 3 | shrub | perennial |
| Elaeagnus umbellata | Elaeagnaceae | Autumn Olive | ELAUMB | non-native | 0 | 5 | shrub | perennial |
| Elatine triandra | Elatinaceae | Waterwort | ELATRI | native | 10 | -5 | forb | annual |
| Eleocharis acicularis | Cyperaceae | Needle Spike Rush | ELEACI | native | 5 | -5 | sedge | perennial |
| Eleocharis atropurpurea | Cyperaceae | Purple Spike Rush | ELEATR | native | 10 | -3 | sedge | annual |
| Eleocharis compressa var. acutisquamata | Cyperaceae | Flat-Stemmed Spike Rush | ELECOA | native | 6 | -3 | sedge | perennial |
| Eleocharis compressa var. compressa | Cyperaceae | Flat-Stemmed Spike Rush | ELECOC | native | 5 | -3 | sedge | perennial |
| Eleocharis elliptica | Cyperaceae | Elliptic Spike Rush | ELEELL | native | 4 | -5 | sedge | perennial |
| Eleocharis engelmannii | Cyperaceae | Engelmanns Spike Rush | ELEENG | native | 5 | -3 | sedge | annual |
| Eleocharis equisetoides | Cyperaceae | Knotted Spike Rush | ELEEQU | native | 10 | -5 | sedge | perennial |
| Eleocharis erythropoda | Cyperaceae | Bald Spike Rush | ELEERY | native | 5 | -5 | sedge | perennial |
| Eleocharis lanceolata | Cyperaceae | Daggerleaf Spike-Rush | ELELAN | native | 6 | -3 | sedge | annual |
| Eleocharis macrostachya | Cyperaceae | Pale Spike-Rush | ELEMAC | native | 7 | -5 | sedge | perennial |
| Eleocharis obtusa | Cyperaceae | Blunt Spike Rush | ELEOBT | native | 2 | -5 | sedge | annual |
| Eleocharis ovata | Cyperaceae | Oval Spike Rush | ELEOVA | native | 2 | -5 | sedge | annual |
| Eleocharis palustris | Cyperaceae | Marsh Spike Rush | ELEPAL | native | 5 | -5 | sedge | perennial |
| Eleocharis parvula | Cyperaceae | Small Spike-Rush | ELEPAR | native | 7 | -5 | sedge | perennial |
| Eleocharis quadrangulata | Cyperaceae | Angled Spike Rush | ELEQUA | native | 5 | -5 | sedge | perennial |
| Eleocharis tenuis var. atrata | Cyperaceae | Wiry Spike Rush | ELETEN | native | 6 | -3 | sedge | perennial |
| Eleocharis verrucosa | Cyperaceae | Slender Spike Rush | ELEVER | native | 4 | -3 | sedge | perennial |
| Eleocharis wolfii | Cyperaceae | Wolfs Spike Rush | ELEWOL | native | 9 | -5 | sedge | perennial |
| Eleocharis xyridiformis | Cyperaceae | Big Flat Spike Rush | ELEXYR | native | 7 | -5 | sedge | perennial |
| Elephantopus carolinianus | Asteraceae | Elephants Foot | ELECAR | native | 3 | 3 | forb | perennial |
| Eleusine indica | Poaceae | Indian Goose Grass | ELEIND | non-native | 0 | 3 | grass | annual |
| Eleusine tristachya | Poaceae | Threespike Goose Grass | ELETRI | non-native | 0 | 5 | grass | perennial |
| Ellisia nyctelea | Hydrophyllaceae | Aunt Lucy | ELLNYC | native | 1 | 3 | forb | annual |
| Elodea canadensis | Hydrocharitaceae | Common Waterweed | ELOCAN | native | 10 | -5 | forb | perennial |
| Elodea nuttallii | Hydrocharitaceae | Slender Waterweed | ELONUT | native | 7 | -5 | forb | perennial |
| Elymus canadensis | Poaceae | Canada Wild Rye | ELYCAN | native | 5 | 3 | grass | perennial |
| Elymus churchii | Poaceae | Churchs Wild Rye | ELYCHU | native | 10 | 5 | grass | perennial |
| Elymus curvatus | Poaceae | Awnless Wild Rye | ELYCUR | native | 3 | 0 | grass | perennial |
| Elymus elongatus subsp. ponticus | Poaceae | Tall Wheat Grass | ELYELO | non-native | 0 | 5 | grass | perennial |
| Elymus glabriflorus | Poaceae | Southeastern Wild Rye | ELYGLR | native | 4 | 0 | grass | perennial |
| Elymus glaucus | Poaceae | Blue Wild Rye | ELYGLU | native | 10 | 3 | grass | perennial |
| Elymus hystrix | Poaceae | Bottlebrush Grass | ELYHYS | native | 4 | 3 | grass | perennial |
| Elymus jejunus | Poaceae | Virginia Wild Rye | ELYJEJ | native | 7 | 0 | grass | perennial |
| Elymus longifolius | Poaceae | Squirreltail | ELYLON | non-native | 0 | 3 | grass | perennial |
| Elymus macgregorii | Poaceae | Early Wild Rye | ELYMAC | native | 6 | 0 | grass | perennial |
| Elymus repens | Poaceae | Quack Grass | ELYREP | non-native | 0 | 3 | grass | perennial |
| Elymus riparius | Poaceae | Riverbank Wild Rye | ELYRIP | native | 7 | -3 | grass | perennial |
| Elymus trachycaulus | Poaceae | Slender Wheat Grass | ELYTRA | non-native | 0 | 3 | grass | perennial |
| Elymus villosus | Poaceae | Silky Wild Rye | ELYVIL | native | 4 | 3 | grass | perennial |
| Elymus virginicus | Poaceae | Virginia Wild Rye | ELYVIR | native | 5 | 0 | grass | perennial |
| Engelmannia peristenia | Asteraceae | Engelmanns Daisy | ENGPER | non-native | 0 | 5 | forb | perennial |
| Epifagus virginiana | Orobanchaceae | Beech Drops | EPIVIR | native | 10 | 5 | forb | perennial |
| Epilobium ciliatum | Onagraceae | Fringed Willow Herb | EPICIL | non-native | 0 | 0 | forb | perennial |
| Epilobium coloratum | Onagraceae | Cinnanmon Willow Herb | EPICOL | native | 6 | -5 | forb | perennial |
| Epilobium leptophyllum | Onagraceae | Fen Willow Herb | EPILEP | native | 10 | -5 | forb | perennial |
| Epipactis helleborine | Orchidaceae | Hellerborine | EPIHEL | non-native | 0 | 5 | forb | perennial |
| Equisetum arvense | Equisetaceae | Horsetail | EQUARV | native | 1 | 0 | fern | perennial |
| Equisetum hyemale | Equisetaceae | Scouring Rush | EQUHYE | native | 3 | -3 | fern | perennial |
| Equisetum laevigatum | Equisetaceae | Smooth Scouring Rush | EQULAE | native | 4 | -3 | fern | perennial |
| Equisetum x ferrissii | Equisetaceae | Ferriss Horsetail | EQUFER | native | 3 | -3 | fern | perennial |
| Equisetum x nelsonii | Equisetaceae | Fen Horsetail | EQUNEL | native | 10 | -5 | fern | perennial |
| Eragrostis barrelieri | Poaceae | Mediterranean Love Grass | ERABAR | non-native | 0 | 5 | grass | annual |
| Eragrostis capillaris | Poaceae | Lace Grass | ERACAP | native | 3 | 5 | grass | annual |
| Eragrostis cilianensis | Poaceae | Stink Grass | ERACIL | non-native | 0 | 3 | grass | annual |
| Eragrostis curtipedicellata | Poaceae | Gummy Love Grass | ERACUT | non-native | 0 | 5 | grass | perennial |
| Eragrostis curvula | Poaceae | Weeping Love Grass | ERACUV | non-native | 0 | 5 | grass | perennial |
| Eragrostis elliottii | Poaceae | Elliotts Love Grass | ERAELL | non-native | 0 | -3 | grass | perennial |
| Eragrostis frankii | Poaceae | Sandbar Love Grass | ERAFRA | native | 3 | -3 | grass | annual |
| Eragrostis glomerata | Poaceae | Pond Love Grass | ERAGLO | native | 4 | 5 | grass | annual |
| Eragrostis hirsuta | Poaceae | Bigtop Love Grass | ERAHIR | native | 4 | 3 | grass | perennial |
| Eragrostis hypnoides | Poaceae | Creeping Love Grass | ERAHYP | native | 4 | -5 | grass | annual |
| Eragrostis intermedia | Poaceae | Plains Love Grass | ERAINT | native | 5 | 5 | grass | perennial |
| Eragrostis minor | Poaceae | Little Love Grass | ERAMIN | non-native | 0 | 5 | grass | annual |
| Eragrostis pectinacea var. miserrima | Poaceae | Carolina Love Grass | ERAPEM | non-native | 0 | 0 | grass | annual |
| Eragrostis pectinacea var. pectinacea | Poaceae | Small Love Grass | ERAPEP | native | 0 | 0 | grass | annual |
| Eragrostis pilosa | Poaceae | India Love Grass | ERAPIL | non-native | 0 | 3 | grass | annual |
| Eragrostis reptans | Poaceae | Pony Grass | ERAREP | native | 10 | -3 | grass | annual |
| Eragrostis secundiflora subsp. oxylepis | Poaceae | Red Love Grass | ERASEC | non-native | 0 | 5 | grass | perennial |
| Eragrostis spectabilis | Poaceae | Purple Love Grass | ERASPE | native | 3 | 5 | grass | perennial |
| Eragrostis trichodes | Poaceae | Tall Love Grass | ERATRI | native | 4 | 5 | grass | perennial |
| Eranthus hyemalis | Ranunculaceae | Winter Aconite | ERAHYE | non-native | 0 | 5 | forb | perennial |
| Erechtites hieracifolius | Asteraceae | Fireweed | EREHIE | native | 1 | 5 | forb | annual |
| Erianthus alopecuroides | Poaceae | Silver Plumegrass | ERIALO | native | 8 | 3 | grass | perennial |
| Erianthus giganteus | Poaceae | Sugarcane Plumegrass | ERIGIG | non-native | 0 | -3 | grass | perennial |
| Erianthus ravennae | Poaceae | Plumegrass | ERIRAV | non-native | 0 | 3 | grass | perennial |
| Erianthus strictus | Poaceae | Narrow Plumegrass | ERISTT | native | 10 | -5 | grass | perennial |
| Erigenia bulbosa | Apiaceae | Harbinger Of Spring | ERIBUL | native | 6 | 5 | forb | perennial |
| Erigeron annuus | Asteraceae | Annual Fleabane | ERIGAN | native | 1 | 3 | forb | annual |
| Erigeron philadelphicus | Asteraceae | Marsh Fleabane | ERIPHI | native | 3 | 0 | forb | biennial |
| Erigeron pulchellus | Asteraceae | Robins Plantain | ERIPUL | native | 6 | 3 | forb | biennial |
| Erigeron strigosus | Asteraceae | Daisy Fleabane | ERISTG | native | 3 | 3 | forb | annual |
| Erigeron tenuis | Asteraceae | Slender Rough Fleabane | ERITEN | native | 4 | 5 | forb | perennial |
| Eriochloa acuminata | Poaceae | Cup Grass | ERIACU | non-native | 0 | 0 | grass | annual |
| Eriochloa contracta | Poaceae | Prairie Cup Grass | ERICON | non-native | 0 | 3 | grass | annual |
| Eriochloa villosa | Poaceae | Wooly Cup Grass | ERIVIL | non-native | 0 | 5 | grass | annual |
| Eriogonum annuum | Polygonaceae | Annual Buckwheat | ERIOAN | non-native | 0 | 5 | forb | annual |
| Eriogonum longifolium | Polygonaceae | Umbrella Plant | ERILON | native | 10 | 5 | forb | perennial |
| Erodium cicutarium | Geraniaceae | Storksbill | EROCIC | non-native | 0 | 5 | forb | annual |
| Erodium texanum | Geraniaceae | Large-Flowered Storkbill | EROTEX | non-native | 0 | 5 | forb | annual |
| Erucastrum gallicum | Brassicaceae | Dog Mustard | ERUGAL | non-native | 0 | 5 | forb | annual |
| Eruca vesicaria subsp. sativa | Brassicaceae | Garden Rocket | ERUVES | non-native | 0 | 5 | forb | annual |
| Eryngium leavenworthii | Apiaceae | Leavenworth Eryngo | ERYLEA | non-native | 0 | 5 | forb | annual |
| Eryngium prostratum | Apiaceae | Creeping Coyote Thistle | ERYPRO | native | 5 | -5 | forb | perennial |
| Eryngium yuccifolium | Apiaceae | Rattlesnake Master | ERYYUC | native | 8 | 0 | forb | perennial |
| Erysimum capitatum | Brassicaceae | Western Wallflower | ERYCAP | native | 8 | 5 | forb | biennial |
| Erysimum cheiranthoides | Brassicaceae | Wormseed Mustard | ERYCHE | non-native | 0 | 3 | forb | annual |
| Erysimum inconspicuum | Brassicaceae | Small Wormseed Mustard | ERYINC | non-native | 0 | 5 | forb | perennial |
| Erysimum repandum | Brassicaceae | Treacle Mustard | ERYREP | non-native | 0 | 5 | forb | annual |
| Erythronium albidum | Liliaceae | White Trout Lily | ERYALB | native | 5 | 3 | forb | perennial |
| Erythronium americanum | Liliaceae | Yellow Trout Lily | ERYAME | native | 8 | 5 | forb | perennial |
| Erythronium mesochoreum | Liliaceae | Prairie Trout Lily | ERYMES | native | 7 | 5 | forb | perennial |
| Erythronium rostratum | Liliaceae | Southern Yellow Trout Lily | ERYROS | native | 8 | 3 | forb | perennial |
| Eschscholtzia californica | Papaveraceae | California Poppy | ESCCAL | non-native | 0 | 5 | forb | perennial |
| Euonymus alatus | Celastraceae | Winged Wahoo | EUOALA | non-native | 0 | 5 | shrub | perennial |
| Euonymus americanus | Celastraceae | Strawberry Bush | EUOAME | native | 10 | 0 | shrub | perennial |
| Euonymus atropurpureus | Celastraceae | Wahoo | EUOATR | native | 5 | 3 | shrub | perennial |
| Euonymus europaeus | Celastraceae | European Spindletree | EUOEUR | non-native | 0 | 5 | shrub | perennial |
| Euonymus hederaceus | Celastraceae | Wintercreeper | EUOHED | non-native | 0 | 5 | shrub | perennial |
| Euonymus obovatus | Celastraceae | Running Strawberry Bush | EUOOBO | native | 9 | 0 | shrub | perennial |
| Eupatorium album | Asteraceae | White Throughwort | EUPALB | native | 7 | 5 | forb | perennial |
| Eupatorium altissimum | Asteraceae | Tall Boneset | EUPALT | native | 3 | 5 | forb | perennial |
| Eupatorium capillifolium | Asteraceae | Yankeeweed | EUPCAP | non-native | 0 | 3 | forb | annual |
| Eupatorium fistulosum | Asteraceae | Hollow Joe Pye Weed | EUPFIS | native | 8 | -5 | forb | perennial |
| Eupatorium hyssopifolium var. calcaratum | Asteraceae | Hyssop-Leaved Thoroughwort | EUPHYS | native | 5 | 5 | forb | perennial |
| Eupatorium maculatum | Asteraceae | Spotted Joe Pye Weed | EUPMAC | native | 10 | -5 | forb | perennial |
| Eupatorium perfoliatum | Asteraceae | Common Boneset | EUPPER | native | 3 | -3 | forb | perennial |
| Eupatorium purpureum | Asteraceae | Purple Joe Pye Weed | EUPPUR | native | 6 | 0 | forb | perennial |
| Eupatorium rotundifolium | Asteraceae | Round-Leaved Boneset | EUPROT | native | 3 | 0 | forb | perennial |
| Eupatorium semiserratum | Asteraceae | Small-Flowered Thoroughwort | EUPSEM | native | 8 | -3 | forb | perennial |
| Eupatorium serotinum | Asteraceae | Late Boneset | EUPSER | native | 1 | 0 | forb | perennial |
| Eupatorium sessilifolium | Asteraceae | Upland Boneset | EUPSES | native | 7 | 5 | forb | perennial |
| Eupatorium torreyanum | Asteraceae | Torreys Boneset | EUPTOR | native | 3 | 5 | forb | perennial |
| Euphorbia commutata | Euphorbiaceae | Tinted Spurge | EPHCOM | native | 6 | 3 | forb | biennial |
| Euphorbia corollata | Euphorbiaceae | Flowering Spurge | EPHCOR | native | 3 | 5 | forb | perennial |
| Euphorbia cyathophora | Euphorbiaceae | Painted Spurge | EPHCYA | native | 4 | 3 | forb | annual |
| Euphorbia cyparissias | Euphorbiaceae | Cypress Spurge | EPHCYP | non-native | 0 | 5 | forb | perennial |
| Euphorbia davidii | Euphorbiaceae | Narrow-Lesved Toothed Spurge | EPHDAV | native | 1 | 5 | forb | annual |
| Euphorbia dentata | Euphorbiaceae | Toothed Spurge | EPHDEN | native | 0 | 5 | forb | annual |
| Euphorbia esula | Euphorbiaceae | Leafy Spurge | EPHESU | non-native | 0 | 5 | forb | perennial |
| Euphorbia geyeri | Euphorbiaceae | Geyers Spurge | EPHGEY | native | 10 | 5 | forb | annual |
| Euphorbia glyptosperma | Euphorbiaceae | Ridge-Seeded Spurge | EPHGLY | native | 6 | 5 | forb | annual |
| Euphorbia humistrata | Euphorbiaceae | Spreading Spurge | EPHHUM | native | 3 | 0 | forb | annual |
| Euphorbia maculata | Euphorbiaceae | Creeping Spurge | EPHMAC | native | 0 | 3 | forb | annual |
| Euphorbia marginata | Euphorbiaceae | Snow-On-The-Mountain | EPHMAR | native | 3 | 5 | forb | annual |
| Euphorbia missurica | Euphorbiaceae | Missouri Spurge | EPHMIS | native | 8 | 5 | forb | annual |
| Euphorbia nutans | Euphorbiaceae | Nodding Spurge | EPHNUT | native | 0 | 3 | forb | annual |
| Euphorbia obtusata | Euphorbiaceae | Blunt-Leaved Spurge | EPHOBT | native | 3 | 3 | forb | annual |
| Euphorbia opthalmica | Euphorbiaceae | Florida Hammock Sandmat | EUPOPT | non-native | 0 | 5 | forb | annual |
| Euphorbia ouachitana | Euphorbiaceae | Ouachita Spurge | EUPOUA | native | 6 | 5 | forb | annual |
| Euphorbia prostrata | Euphorbiaceae | Groundfig Spurge | EPHPRO | non-native | 0 | 3 | forb | annual |
| Euphorbia serpens | Euphorbiaceae | Round-Leaved Spurge | EPHSEE | native | 4 | 0 | forb | annual |
| Euphorbia serpyllifolia | Euphorbiaceae | Thyme-Leaved Spurge | EPHSEY | non-native | 0 | 5 | forb | annual |
| Euphorbia spathulata | Euphorbiaceae | Prairie Spurge | EPHSPA | native | 5 | 3 | forb | annual |
| Euphorbia stictospora | Euphorbiaceae | Mat Spurge | EPHSTI | non-native | 0 | 5 | forb | annual |
| Eurybia furcata | Asteraceae | Forked Aster | EURFUR | native | 10 | 5 | forb | perennial |
| Eurybia hemispherica | Asteraceae | Southern Swamp Aster | EURHEM | native | 9 | 3 | forb | perennial |
| Eurybia macrophylla | Asteraceae | Big-Leaved Aster | EURMAC | native | 10 | 5 | forb | perennial |
| Euthamia graminifolia | Asteraceae | Hairy Grass-Leaved Goldenrod | EUTGRA | native | 3 | 0 | forb | perennial |
| Euthamia gymnospermoides | Asteraceae | Viscid Grass-Leaved Goldenrod | EUTGYM | native | 4 | 3 | forb | perennial |
| Euthamia leptocephala | Asteraceae | Western Bushy Goldenrod | EUTLEP | native | 8 | -3 | forb | perennial |
| Evolvulus alsinoides | Convolvulaceae | Dwarf Morning Glory | EVOALS | non-native | 0 | 5 | forb | perennial |
| Evolvulus nuttallianus | Convolvulaceae | Shaggy Evolvulus | EVONUT | native | 8 | 5 | forb | perennial |
| Exochorda racemosa | Rosaceae | Common Pearlbush | EXORAC | non-native | 0 | 5 | shrub | perennial |
| Fagopyrum esculentum | Polygonaceae | Buckwheat | FAGESC | non-native | 0 | 5 | forb | annual |
| Fagus grandifolia | Fagaceae | Beech | FAGGRA | native | 8 | 3 | tree | perennial |
| Falcaria vulgaris | Apiaceae | Sickleweed | FALVUL | non-native | 0 | 5 | forb | perennial |
| Fallopia convolvulus | Polygonaceae | Black Bindweed | FALCON | non-native | 0 | 3 | forb | annual |
| Fallopia dumetorum | Polygonaceae | False Buckwheat Weed | FALDUM | non-native | 0 | 3 | forb | perennial |
| Fallopia japonica | Polygonaceae | Japanese Knotweed | FALJAP | non-native | 0 | 3 | forb | perennial |
| Fallopia scandens | Polygonaceae | Climbing False Buckwheat | FALSCA | native | 3 | 0 | forb | perennial |
| Fatoua villosa | Moraceae | Hairy Crabweed | FATVIL | non-native | 0 | 0 | forb | annual |
| Festuca arundinacea | Poaceae | Tall Fescue | FESARU | non-native | 0 | 0 | grass | perennial |
| Festuca ovina | Poaceae | Sheep Fescue | FESOVI | non-native | 0 | 5 | grass | perennial |
| Festuca paradoxa | Poaceae | Cluster Fescue | FESPAR | native | 6 | 0 | grass | perennial |
| Festuca pratensis | Poaceae | Meadow Fescue | FESPRA | non-native | 0 | 3 | grass | perennial |
| Festuca rubra | Poaceae | Red Fescue | FESRUB | non-native | 0 | 3 | grass | perennial |
| Festuca sororia | Poaceae | Ravine Fescue | FESSOR | non-native | 0 | 5 | grass | perennial |
| Festuca subverticillata | Poaceae | Nodding Fescue | FESSUB | native | 4 | 3 | grass | perennial |
| Festuca trachyphylla | Poaceae | Hard Fescue | FESTRA | non-native | 0 | 5 | grass | perennial |
| Filipendula rubra | Rosaceae | Queen Of The Prairie | FILRUB | native | 10 | -5 | forb | perennial |
| Fimbristylis annua | Cyperaceae | Tall Fimbry | FIMANN | native | 5 | -3 | sedge | annual |
| Fimbristylis autumnalis | Cyperaceae | Autumn Sedge | FIMAUT | native | 5 | -3 | sedge | annual |
| Fimbristylis littoralis | Cyperaceae | Grassy-Like Fimbry | FIMLIT | non-native | 0 | -5 | sedge | annual |
| Fimbristylis puberula | Cyperaceae | Glade Fimbry | FIMPUB | native | 7 | 3 | sedge | perennial |
| Fimbristylis vahlii | Cyperaceae | Vahls Fimbry | FIMVAH | native | 4 | -5 | sedge | annual |
| Flaveria campestris | Asteraceae | Plains Flaveria | FLACAM | non-native | 0 | 0 | forb | annual |
| Fleischmannia incarnata | Asteraceae | Pink Thoroughwort | FLEINC | native | 9 | 0 | forb | perennial |
| Floerkea proserpinacoides | Limnanthaceae | False Mermaid | FLOPRO | native | 10 | 0 | forb | annual |
| Foeniculum vulgare | Apiaceae | Fennel | FOEVUL | non-native | 0 | 5 | forb | perennial |
| Fontanesia phillyreoides subsp. fortunei | Oleaceae | Persian Lilac | FONPHI | non-native | 0 | 5 | shrub | perennial |
| Forestiera acuminata | Oleaceae | Swamp Privet | FORACU | native | 6 | -5 | tree | perennial |
| Forsythia suspensa | Oleaceae | Weeping Forsythia | FORSUS | non-native | 0 | 5 | shrub | perennial |
| Fragaria vesca var. americana | Rosaceae | Hillside Strawberry | FRAVES | native | 10 | 5 | forb | perennial |
| Fragaria virginiana | Rosaceae | Wild Strawberry | FRAVIR | native | 3 | 3 | forb | perennial |
| Fragaria x ananassa | Rosaceae | Garden Strawberry | FRAANA | non-native | 0 | 5 | forb | perennial |
| Frasera caroliniensis | Gentianaceae | American Columbo | FRACAR | native | 7 | 5 | forb | perennial |
| Fraxinus americana | Oleaceae | White Ash | FRAAME | native | 4 | 3 | tree | perennial |
| Fraxinus biltmoreana | Oleaceae | Biltmore Ash | FRABIL | native | 5 | 3 | tree | perennial |
| Fraxinus pennsylvanica var. pennsylvanica | Oleaceae | Red Ash | FRAPEP | native | 5 | -3 | tree | perennial |
| Fraxinus pennsylvanica var. subintegerrima | Oleaceae | Green Ash | FRAPES | native | 2 | -3 | tree | perennial |
| Fraxinus profunda | Oleaceae | Pumpkin Ash | FRAPRO | native | 8 | -5 | tree | perennial |
| Fraxinus quadrangulata | Oleaceae | Blue Ash | FRAQUA | native | 7 | 5 | tree | perennial |
| Fraxinus smallii | Oleaceae | Sullivans Ash | FRASMA | native | 3 | 3 | tree | perennial |
| Froelichia floridana var. campestris | Amaranthaceae | Large Cottonweed | FROFLO | native | 4 | 5 | forb | annual |
| Froelichia gracilis | Amaranthaceae | Small Cottonweed | FROGRA | native | 3 | 5 | forb | annual |
| Fuirena simplex var. aristatula | Cyperaceae | Plains Umbrella Grass | FUISIA | native | 10 | -5 | sedge | annual |
| Fuirena simplex var. simplex | Cyperaceae | Umbrella Grass | FUISIS | native | 8 | -5 | sedge | perennial |
| Fumaria officinalis | Fumariaceae | Fumitory | FUMOFF | non-native | 0 | 5 | forb | annual |
| Gaillardia aestivalis var. flavovirens | Asteraceae | Yellow Blanket Flower | GAIAES | native | 10 | 5 | forb | perennial |
| Gaillardia pulchella | Asteraceae | Blanket Flower | GAIPUL | non-native | 0 | 5 | forb | annual |
| Galactia regularis | Fabaceae | Milk Pea | GALREG | native | 6 | 5 | forb | perennial |
| Galanthus nivalis | Liliaceae | Snowdrop | GALNIV | non-native | 0 | 5 | forb | perennial |
| Galearis spectabilis | Orchidaceae | Showy Orchis | GALSPE | native | 7 | 5 | forb | perennial |
| Galeopsis tetrahit | Lamiaceae | Common Hemp Nettle | GALTET | non-native | 0 | 3 | forb | annual |
| Galinsoga parviflora | Asteraceae | Smooth Peruvian Daisy | GALPAR | non-native | 0 | 5 | forb | annual |
| Galinsoga quadriradiata | Asteraceae | Peruvian Daisy | GALQUA | non-native | 0 | 3 | forb | annual |
| Galium anglicum | Rubiaceae | Lamarcks Bedstraw | GALANG | non-native | 0 | 5 | forb | annual |
| Galium aparine | Rubiaceae | Annual Bedstraw | GALAPA | native | 0 | 3 | forb | annual |
| Galium arkansanum | Rubiaceae | Arkansas Bedstraw | GALARK | native | 6 | 5 | forb | perennial |
| Galium asprellum | Rubiaceae | Rough Bedstraw | GALASP | native | 10 | -5 | forb | perennial |
| Galium boreale | Rubiaceae | Northern Bedstraw | GALBOR | native | 10 | 0 | forb | perennial |
| Galium circaezans | Rubiaceae | Licorice Bedstraw | GALCIR | native | 4 | 5 | forb | perennial |
| Galium concinnum | Rubiaceae | Shining Bedstraw | GALCON | native | 4 | 5 | forb | perennial |
| Galium divaricatum | Rubiaceae | Wall Bedstraw | GALDIV | non-native | 0 | 0 | forb | annual |
| Galium obtusum | Rubiaceae | Wild Madder | GALOBT | native | 5 | -3 | forb | perennial |
| Galium pedemontanum | Rubiaceae | Piedmont Bedstraw | GALPED | non-native | 0 | 5 | forb | annual |
| Galium pilosum | Rubiaceae | Hairy Bedstraw | GALPIL | native | 6 | 5 | forb | perennial |
| Galium tinctorium | Rubiaceae | Stiff Bedstraw | GALTIN | native | 6 | -5 | forb | perennial |
| Galium triflorum | Rubiaceae | Sweet-Scented Bedstraw | GALTRI | native | 4 | 3 | forb | perennial |
| Galium verum | Rubiaceae | Yellow Bedstraw | GALVER | non-native | 0 | 5 | forb | perennial |
| Galium virgatum | Rubiaceae | Dwarf Bedstraw | GALVIR | native | 4 | 5 | forb | annual |
| Gamochaeta argyrinea | Asteraceae | Southern Cudweed | GAMARG | native | 2 | 5 | forb | annual |
| Gamochaeta pensylvanica | Asteraceae | Pennsylvania Cudweed | GAMPEN | non-native | 0 | 5 | forb | annual |
| Gamochaeta purpurea | Asteraceae | Early Cudweed | GAMPUR | native | 3 | 5 | forb | annual |
| Gaura coccinea | Onagraceae | Scarlet Gaura | GAUCOC | native | 4 | 5 | forb | perennial |
| Gaura longiflora | Onagraceae | Biennial Gaura | GAULON | native | 1 | 5 | forb | biennial |
| Gaura parviflora | Onagraceae | Small-Flowered Gaura | GAUPAR | native | 2 | 5 | forb | biennial |
| Gaura sinuata | Onagraceae | Wavy-Leaved Gaura | GAUSIN | non-native | 0 | 5 | forb | perennial |
| Gaylussacia baccata | Ericaceae | Huckleberry | GAYBAC | native | 10 | 3 | shrub | perennial |
| Gentiana alba | Gentianaceae | Yellowish Gentian | GENALB | native | 8 | 3 | forb | perennial |
| Gentiana andrewsii var. andrewsii | Gentianaceae | Closed Gentian | GENANA | native | 10 | -3 | forb | perennial |
| Gentiana andrewsii var. dakotica | Gentianaceae | Closed Gentian | GENANK | native | 9 | -3 | forb | perennial |
| Gentiana puberulenta | Gentianaceae | Downy Gentian | GENPUB | native | 9 | 5 | forb | perennial |
| Gentianella quinquefolia subsp. occidentalis | Gentianaceae | Stiff Gentian | GENQUI | native | 10 | -3 | forb | annual |
| Geocarpon minimum | Caryophyllaceae | Geocarpon | GEOMIN | native | 10 | 5 | forb | annual |
| Geranium carolinianum | Geraniaceae | Carolina Cranesbill | GERCAR | native | 0 | 5 | forb | annual |
| Geranium columbinum | Geraniaceae | Longstalk Cranesbill | GERCOL | non-native | 0 | 5 | forb | annual |
| Geranium dissectum | Geraniaceae | Cut-Leaved Cranesbill | GERDIS | non-native | 0 | 5 | forb | annual |
| Geranium maculatum | Geraniaceae | Wild Geranium | GERMAC | native | 5 | 3 | forb | perennial |
| Geranium molle | Geraniaceae | Doves-Foot Cranesbill | GERMOL | non-native | 0 | 5 | forb | annual |
| Geranium pusillum | Geraniaceae | Small Geranium | GERPUS | non-native | 0 | 5 | forb | annual |
| Geum canadense | Rosaceae | White Avens | GEUCAN | native | 2 | 3 | forb | perennial |
| Geum fragarioides | Rosaceae | Barren Strawberry | GEUFRA | native | 10 | 5 | forb | perennial |
| Geum laciniatum | Rosaceae | Rough Avens | GEULAC | native | 6 | -3 | forb | perennial |
| Geum triflorum | Rosaceae | Prairie Smoke | GEUTRI | native | 10 | 5 | forb | perennial |
| Geum vernum | Rosaceae | Spring Avens | GEUVER | native | 3 | 3 | forb | perennial |
| Geum virginianum | Rosaceae | Pale Avens | GEUVIR | native | 9 | 3 | forb | perennial |
| Gillenia stipulata | Rosaceae | American Ipecac | GILSTI | native | 5 | 5 | forb | perennial |
| Gillenia trifoliata | Rosaceae | Bowmans Root | GILTRI | native | 10 | 5 | forb | perennial |
| Gladiolus communis | Iridaceae | Garden Gladiolus | GLACOM | non-native | 0 | 5 | forb | perennial |
| Glandularia bipinnatifida | Verbenaceae | Dakota Verbena | GLABIP | native | 0 | 5 | forb | perennial |
| Glandularia canadensis | Verbenaceae | Rose Vervain | GLACAN | native | 5 | 5 | forb | perennial |
| Glechoma hederacea | Lamiaceae | Creeping Charlie | GLEHED | non-native | 0 | 3 | forb | perennial |
| Gleditsia aquatica | Fabaceae | Water Locust | GLEAQU | native | 10 | -5 | tree | perennial |
| Gleditsia triacanthos | Fabaceae | Honey Locust | GLETRI | native | 2 | 0 | tree | perennial |
| Glinus lotoides | Molluginaceae | Glinus | GLILOT | non-native | 0 | -3 | forb | annual |
| Glyceria acutiflora | Poaceae | Sharp-Scaled Manna Grass | GLYACU | native | 10 | -5 | grass | perennial |
| Glyceria septentrionalis var. arkansana | Poaceae | Arkansas Manna Grass | GLYSEA | native | 9 | -5 | grass | perennial |
| Glyceria septentrionalis var. septentrionalis | Poaceae | Floating Mannagrass | GLYSES | native | 8 | -5 | grass | perennial |
| Glyceria striata | Poaceae | Fowl Manna Grass | GLYSTR | native | 4 | -5 | grass | perennial |
| Glycine max | Fabaceae | Soy Bean | GLYMAX | non-native | 0 | 5 | forb | annual |
| Glycyrrhiza lepidota | Fabaceae | Wild Licorice | GLYLEP | native | 4 | 5 | forb | perennial |
| Gonolobus suberosus | Asclepiadaceae | Large-Leaved Angle-Pod | GONSUB | native | 7 | -3 | forb | perennial |
| Goodyera pubescens | Orchidaceae | Rattlesnake Plantain | GOOPUB | native | 10 | 3 | forb | perennial |
| Gossypium hirsutum | Malvaceae | Cotton | GOSHIR | non-native | 0 | 5 | forb | annual |
| Gratiola neglecta | Plantaginaceae | Clammy Hedge Hyssop | GRANEG | native | 4 | -5 | forb | annual |
| Gratiola virginiana | Plantaginaceae | Round-Fruited Hedge Hyssop | GRAVIR | native | 8 | -5 | forb | biennial |
| Gratiola viscidula | Plantaginaceae | Hedge Hyssop | GRAVIS | native | 10 | -5 | forb | perennial |
| Grindelia ciliata | Asteraceae | Goldenweed | GRICIL | non-native | 0 | 5 | forb | annual |
| Grindelia lanceolata | Asteraceae | Spiny-Toothed Gumweed | GRILAN | native | 3 | 5 | forb | perennial |
| Grindelia squarrosa | Asteraceae | Gum Plant | GRISQU | non-native | 0 | 3 | forb | biennial |
| Guizotia abyssinica | Asteraceae | Niger Thistle | GUIABY | non-native | 0 | 5 | forb | annual |
| Gutierrezia texana | Asteraceae | Texas Snakeweed | GUTTEX | non-native | 0 | 5 | forb | annual |
| Gymnocladus dioica | Fabaceae | Kentucky Coffee Tree | GYMDIO | native | 6 | 5 | tree | perennial |
| Gymnopogon ambiguus | Poaceae | Beard Grass | GYMAMB | native | 8 | 5 | grass | perennial |
| Hackelia virginiana | Boraginaceae | Stickseed | HACVIR | native | 3 | 3 | forb | biennial |
| Halesia diptera | Styracaceae | Two-Wing Silverbell | HALDIP | non-native | 0 | 3 | shrub | perennial |
| Hamamelis vernalis | Hamamelidaceae | Vernal Witch Hazel | HAMVER | native | 7 | 0 | shrub | perennial |
| Hamamelis virginiana | Hamamelidaceae | Witch Hazel | HAMVIR | native | 9 | 3 | tree | perennial |
| Hasteola suaveolens | Asteraceae | Sweet Indian Plantain | HASSUA | native | 9 | -3 | forb | perennial |
| Hedeoma hispida | Lamiaceae | Rough Pennyroyal | HEDHIS | native | 3 | 5 | forb | annual |
| Hedeoma pulegioides | Lamiaceae | American Pennyroyal | HEDPUL | native | 4 | 5 | forb | annual |
| Hedera helix | Araliaceae | English Ivy | HEDHEL | non-native | 0 | 3 | vine | perennial |
| Helenium amarum | Asteraceae | Bitterweed | HELAMA | non-native | 0 | 3 | forb | annual |
| Helenium autumnale | Asteraceae | Sneezeweed | HELAUT | native | 5 | -3 | forb | perennial |
| Helenium flexuosum | Asteraceae | Purple-Head Sneezeweed | HELFLE | native | 3 | 0 | forb | perennial |
| Helenium virginicum | Asteraceae | Virginia Sneezeweed | HELVIR | native | 8 | -5 | forb | perennial |
| Helianthemum bicknellii | Cistaceae | Hoary Rockrose | HELBIC | native | 6 | 5 | forb | perennial |
| Helianthemum canadense | Cistaceae | Canada Rockrose | HELCAN | native | 10 | 5 | forb | perennial |
| Helianthus angustifolius | Asteraceae | Swamp Sunflower | HELANG | native | 8 | -3 | forb | perennial |
| Helianthus annuus | Asteraceae | Garden Sunflower | HELANN | native | 0 | 3 | forb | annual |
| Helianthus decapetalus | Asteraceae | Pale Sunflower | HELDEC | native | 9 | 5 | forb | perennial |
| Helianthus divaricatus | Asteraceae | Woodland Sunflower | HELDIV | native | 6 | 5 | forb | perennial |
| Helianthus grosseserratus | Asteraceae | Sawtooth Sunflower | HELGRO | native | 4 | 0 | forb | perennial |
| Helianthus hirsutus | Asteraceae | Oblong Sunflower | HELHIR | native | 4 | 5 | forb | perennial |
| Helianthus maximilianii | Asteraceae | Maximillian Sunflower | HELMAX | native | 5 | 5 | forb | perennial |
| Helianthus microcephalus | Asteraceae | Small Wood Sunflower | HELMIC | native | 8 | 5 | forb | perennial |
| Helianthus mollis | Asteraceae | Downy Sunflower | HELMOL | native | 6 | 5 | forb | perennial |
| Helianthus occidentalis | Asteraceae | Western Sunflower | HELOCC | native | 5 | 5 | forb | perennial |
| Helianthus pauciflorus subsp. pauciflorus | Asteraceae | Showy Sunflower | HELPAP | native | 5 | 5 | forb | perennial |
| Helianthus pauciflorus subsp. subrhomboideus | Asteraceae | Stiff Sunflower | HELPAS | non-native | 0 | 5 | forb | perennial |
| Helianthus petiolaris | Asteraceae | Kansas Sunflower | HELPET | non-native | 0 | 5 | forb | annual |
| Helianthus salicifolius | Asteraceae | Willow-Leaved Sunflower | HELSAL | native | 8 | 5 | forb | perennial |
| Helianthus silphioides | Asteraceae | Ozark Sunflower | HELSIL | native | 7 | 5 | forb | perennial |
| Helianthus strumosus | Asteraceae | Pale-Leaved Sunflower | HELSTR | native | 7 | 0 | forb | perennial |
| Helianthus tuberosus | Asteraceae | Jerusalem Artichoke | HELTUB | native | 3 | 3 | forb | perennial |
| Helianthus x laetiflorus | Asteraceae | Prairie Sunflower | HELLAE | native | 6 | 5 | forb | perennial |
| Heliopsis helianthoides var. helianthoides | Asteraceae | False Sunflower | HELHEH | native | 5 | 0 | forb | perennial |
| Heliopsis helianthoides var. scabra | Asteraceae | Woodland False Sunflower | HELHES | native | 5 | 0 | forb | perennial |
| Heliotropium amplexicaule | Heliotropaceae | Clasping Heliotrope | HELAMP | non-native | 0 | 5 | forb | perennial |
| Heliotropium curassavicum | Heliotropaceae | Seaside Heliotrope | HELCUR | native | 2 | -5 | forb | annual |
| Heliotropium indicum | Heliotropaceae | Indian Heliotrope | HELIND | non-native | 0 | 0 | forb | annual |
| Heliotropium procumbens | Heliotropaceae | Fourspike Heliotrope | HELPRO | non-native | 0 | -3 | forb | annual |
| Heliotropium tenellum | Heliotropaceae | Glade Heliotrope | HELTEN | native | 8 | 5 | forb | annual |
| Helminotheca echioides | Asteraceae | Ox-Tongue | HELECH | non-native | 0 | 5 | forb | annual |
| Hemerocallis fulva | Liliaceae | Orange Day Lily | HEMFUL | non-native | 0 | 5 | forb | perennial |
| Heracleum sphondylium subsp. montanum | Apiaceae | Cow Parsnip | HERSPH | native | 6 | 0 | forb | perennial |
| Hesperis matronalis | Brassicaceae | Dames Rocket | HESMAT | non-native | 0 | 3 | forb | perennial |
| Heteranthera dubia | Pontederiaceae | Water Star-Grass | HETDUB | native | 7 | -5 | forb | perennial |
| Heteranthera limosa | Pontederiaceae | Mud Plantain | HETLIM | native | 5 | -5 | forb | annual |
| Heteranthera multiflora | Pontederiaceae | Bouquet Mud Plantain | HETMUL | native | 5 | -5 | forb | annual |
| Heteranthera reniformis | Pontederiaceae | Kidney-Leaf Mud Plantain | HETREN | native | 10 | -5 | forb | annual |
| Heteranthera rotundifolia | Pontederiaceae | Roundleaf Mud Plantain | HETROT | native | 5 | -5 | forb | annual |
| Heterotheca camporum | Asteraceae | Narrow-Leaved Golden Aster | HETCAM | native | 1 | 5 | forb | perennial |
| Heterotheca canescens | Asteraceae | Hairy Golden Aster | HETCAN | native | 10 | 5 | forb | perennial |
| Heterotheca subaxillaris | Asteraceae | Broad-Leaved Golden Aster | HETSUB | native | 2 | 5 | forb | annual |
| Heuchera americana | Saxifragaceae | Alum Root | HEUAME | native | 7 | 3 | forb | perennial |
| Heuchera parviflora var. parviflora | Saxifragaceae | Small-Flowered Alum Root | HEUPAA | native | 10 | 5 | forb | perennial |
| Heuchera parviflora var. puberula | Saxifragaceae | Small-Flowered Alum Root | HEUPAU | native | 10 | 5 | forb | perennial |
| Heuchera richardsonii | Saxifragaceae | Prairie Alum Root | HEURIC | native | 6 | 3 | forb | perennial |
| Heuchera villosa | Saxifragaceae | Hairy Alum Root | HEUVIL | native | 10 | 5 | forb | perennial |
| Hexalectris spicata | Orchidaceae | Crested Coral Root | HEXSPI | native | 8 | 5 | forb | perennial |
| Hibiscus laevis | Malvaceae | Halberd-Leaved Rose Mallow | HIBLAE | native | 4 | -5 | forb | perennial |
| Hibiscus lasiocarpos | Malvaceae | Rose Mallow | HIBLAS | native | 5 | -5 | forb | perennial |
| Hibiscus syriacus | Malvaceae | Rose Of Sharon | HIBSYR | non-native | 0 | 5 | shrub | perennial |
| Hibiscus trionum | Malvaceae | Flower-Of-An-Hour | HIBTRI | non-native | 0 | 5 | forb | annual |
| Hieracium caespitosum | Asteraceae | Yellow King Devil | HIECAE | non-native | 0 | 5 | forb | perennial |
| Hieracium gronovii | Asteraceae | Hairy Hawkweed | HIEGRO | native | 4 | 5 | forb | perennial |
| Hieracium longipilum | Asteraceae | Long-Bearded Hawkweed | HIELON | native | 6 | 5 | forb | perennial |
| Hieracium scabrum | Asteraceae | Rough Hawkweed | HIESCA | native | 7 | 5 | forb | perennial |
| Holcus lanatus | Poaceae | Velvet Grass | HOLLAN | non-native | 0 | 3 | grass | perennial |
| Holosteum umbellatum | Caryophyllaceae | Jagged Chickweed | HOLUMB | non-native | 0 | 5 | forb | annual |
| Hordeum jubatum | Poaceae | Squirrel-Tail Grass | HORJUB | native | 0 | 0 | grass | perennial |
| Hordeum pusillum | Poaceae | Little Barley | HORPUS | native | 0 | 3 | grass | annual |
| Hordeum vulgare | Poaceae | Barley | HORVUL | non-native | 0 | 5 | grass | annual |
| Hottonia inflata | Primulaceae | Water Violet | HOTINF | native | 10 | -5 | forb | annual |
| Houstonia caerulea | Rubiaceae | Bluets | HOUCAE | native | 6 | 3 | forb | annual |
| Houstonia longifolia var. longifolia | Rubiaceae | Long-Leaved Bluets | HOULOL | native | 5 | 5 | forb | perennial |
| Houstonia longifolia var. tenuifolia | Rubiaceae | Long-Leaved Bluets | HOULOT | native | 5 | 5 | forb | perennial |
| Houstonia micrantha | Rubiaceae | Southern Bluets | HOUMIC | native | 4 | 5 | forb | annual |
| Houstonia nigricans | Rubiaceae | Narrow-Leaved Bluets | HOUNIG | native | 5 | 5 | forb | perennial |
| Houstonia purpurea | Rubiaceae | Broad-Leaved Bluets | HOUPUR | native | 6 | 5 | forb | perennial |
| Houstonia pusilla | Rubiaceae | Least Bluets | HOUPUS | native | 3 | 3 | forb | annual |
| Houstonia rosea | Rubiaceae | Rose Bluets | HOUROS | native | 10 | 5 | forb | annual |
| Humulus japonicus | Cannabaceae | Japanese Hop | HUMJAP | non-native | 0 | 3 | forb | annual |
| Humulus lupulus var. lupulus | Cannabaceae | European Hop | HUMLUL | non-native | 0 | 3 | forb | perennial |
| Humulus lupulus var. neomexicanus | Cannabaceae | Western Hop | HUMLUN | native | 2 | 3 | forb | perennial |
| Humulus lupulus var. pubescens | Cannabaceae | American Hop | HUMLUB | native | 2 | 3 | forb | perennial |
| Huperzia lucidula | Lycopodiaceae | Shining Clubmoss | HUPLUC | native | 10 | -3 | fern | perennial |
| Huperzia porophila | Lycopodiaceae | Fir Clubmoss | HUPPOR | native | 10 | 3 | fern | perennial |
| Hydrangea arborescens | Hydrangeaceae | Wild Hydrangea | HYDARB | native | 7 | 3 | shrub | perennial |
| Hydrastis canadensis | Ranunculaceae | Golden Seal | HYDSCA | native | 6 | 5 | forb | perennial |
| Hydrilla verticillata | Hydrocharitaceae | Water-Thyme | HYDIVE | non-native | 0 | -5 | forb | perennial |
| Hydrocotyle ranunculoides | Apiaceae | Floating Water Pennywort | HYDRAN | native | 0 | -5 | forb | perennial |
| Hydrocotyle verticillata | Apiaceae | Whorled Water Pennywort | HYDOVE | native | 10 | -5 | forb | perennial |
| Hydrolea ovata | Hydroleaceae | Blue Waterleaf | HYDOVA | native | 10 | -5 | forb | perennial |
| Hydrolea uniflora | Hydroleaceae | One-Flower False-Fiddle-Leaf | HYDUNI | native | 6 | -5 | forb | perennial |
| Hydrophyllum appendiculatum | Hydrophyllaceae | Great Waterleaf | HYDAPP | native | 6 | 5 | forb | perennial |
| Hydrophyllum canadense | Hydrophyllaceae | Canada Waterleaf | HYDPCA | native | 7 | 0 | forb | perennial |
| Hydrophyllum virginianum | Hydrophyllaceae | Virginia Waterleaf | HYDVIR | native | 4 | 0 | forb | perennial |
| Hylodesmum glutinosim | Fabaceae | Pointed Tick Trefoil | HYLGLU | native | 3 | 5 | forb | perennial |
| Hylodesmum nudiflorum | Fabaceae | Bare-Stemmed Tick Trefoil | HYLNUD | native | 4 | 5 | forb | perennial |
| Hylodesmum pauciflorum | Fabaceae | Small-Flowered Tick Trefoil | HYLPAU | native | 8 | 5 | forb | perennial |
| Hymenocallis caroliniana | Liliaceae | Spider Lily | HYMCAR | native | 8 | -5 | forb | perennial |
| Hymenopappus scabiosaeus | Asteraceae | Old Plainsman | HYMSCA | native | 7 | 5 | forb | biennial |
| Hypericum adpressum | Clusiaceae | Creeping St. Johns Wort | HYPADP | native | 10 | -5 | forb | perennial |
| Hypericum ascyron subsp. pyramidatum | Clusiaceae | Great St. Johns Wort | HYPASC | native | 10 | 0 | forb | perennial |
| Hypericum drummondii | Clusiaceae | Nits And Lice | HYPDRU | native | 4 | 3 | forb | annual |
| Hypericum gentianoides | Clusiaceae | Orange Grass | HYPGEN | native | 5 | 5 | forb | annual |
| Hypericum gymnanthum | Clusiaceae | Clasping St. Johns Wort | HYPGYM | native | 7 | -5 | forb | annual |
| Hypericum hypericoides | Clusiaceae | Sand St. Andrews Cross | HYPHYP | native | 8 | 3 | forb | perennial |
| Hypericum lobocarpum | Clusiaceae | Bushy St. Johns Wort | HYPLOB | native | 9 | 5 | forb | perennial |
| Hypericum majus | Clusiaceae | Large St. Johns Wort | HYPMAJ | native | 10 | -3 | forb | perennial |
| Hypericum mutilum | Clusiaceae | Weak St. Johns Wort | HYPMUT | native | 4 | -3 | forb | perennial |
| Hypericum perforatum | Clusiaceae | Common St. Johns Wort | HYPPER | non-native | 0 | 3 | forb | perennial |
| Hypericum prolificum | Clusiaceae | Shrubby St. Johns Wort | HYPPRO | native | 4 | 3 | shrub | perennial |
| Hypericum pseudomaculatum | Clusiaceae | False Spotted St. Johns Wort | HYPPSE | native | 3 | 5 | forb | perennial |
| Hypericum punctatum | Clusiaceae | Spotted St. Johns Wort | HYPPUN | native | 3 | 0 | forb | perennial |
| Hypericum sphaerocarpum | Clusiaceae | Round-Fruited St. Johns Wort | HYPSPH | native | 5 | 3 | forb | perennial |
| Hypericum strangulum | Clusiaceae | Common St. Andrews Cross | HYPSTR | native | 6 | 3 | forb | perennial |
| Hypochaeris radicata | Asteraceae | Cats Ear | HYPRAD | non-native | 0 | 5 | forb | perennial |
| Hypoxis hirsuta | Liliaceae | Yellow Star Grass | HYPHIR | native | 5 | 0 | forb | perennial |
| Ilex decidua | Aquifoliaceae | Possum Haw | ILEDEC | native | 5 | -3 | shrub | perennial |
| Ilex opaca | Aquifoliaceae | American Holly | ILEOPA | native | 7 | 3 | tree | perennial |
| Ilex verticillata | Aquifoliaceae | Winterberry | ILEVER | native | 10 | -3 | shrub | perennial |
| Ilex vomitoria | Aquifoliaceae | Yaupon | ILEVOM | non-native | 0 | 0 | shrub | perennial |
| Impatiens balsaminea | Balsaminaceae | Garden Balsam | IMPBAL | non-native | 0 | 5 | forb | annual |
| Impatiens capensis | Balsaminaceae | Orange Jewelweed | IMPCAP | native | 3 | -3 | forb | annual |
| Impatiens pallida | Balsaminaceae | Yellow Jewelweed | IMPPAL | native | 5 | -3 | forb | annual |
| Inula britannica | Asteraceae | British Yellowhead | INUBRI | non-native | 0 | 5 | forb | perennial |
| Inula helenium | Asteraceae | Elecampane | INUHEL | non-native | 0 | 5 | forb | perennial |
| Iodanthus pinnatifidus | Brassicaceae | Violet Cress | IODPIN | native | 7 | -3 | forb | perennial |
| Ionactis linariifolius | Asteraceae | Flax-Leaved Aster | IONLIN | native | 9 | 5 | forb | perennial |
| Ipomoea amnicola | Convolvulaceae | Ivy-Leaved Morning Glory | IPOAMN | non-native | 0 | -3 | forb | perennial |
| Ipomoea coccinea | Convolvulaceae | Scarlet Morning-Glory | IPOCOC | non-native | 0 | 3 | forb | annual |
| Ipomoea hederacea | Convolvulaceae | Red Morning Glory | IPOHED | non-native | 0 | 3 | forb | annual |
| Ipomoea lacunosa | Convolvulaceae | Small Morning Glory | IPOLAC | native | 1 | 0 | forb | annual |
| Ipomoea pandurata | Convolvulaceae | Wild Sweet Potato | IPOPAN | native | 2 | 3 | forb | perennial |
| Ipomoea purpurea | Convolvulaceae | Common Morning Glory | IPOPUR | non-native | 0 | 5 | forb | annual |
| Ipomoea quamoclit | Convolvulaceae | Cypress Vine | IPOQUA | non-native | 0 | 5 | forb | annual |
| Ipomoea tricolor | Convolvulaceae | Grannyvine | IPOTRI | non-native | 0 | 5 | forb | annual |
| Ipomopsis rubra | Polemoniaceae | Standing Cypress | IPORUB | non-native | 0 | 5 | forb | biennial |
| Iresine rhizomatosa | Amaranthaceae | Bloodleaf | IRERHI | native | 5 | -3 | forb | perennial |
| Iris brevicaulis | Iridaceae | Short-Stemmed Iris | IRIBRE | native | 10 | -5 | forb | perennial |
| Iris cristata | Iridaceae | Crested Iris | IRICRI | native | 8 | 5 | forb | perennial |
| Iris fulva | Iridaceae | Copper Iris | IRIFUL | native | 9 | -5 | forb | perennial |
| Iris germanica | Iridaceae | German Iris | IRIGER | non-native | 0 | 5 | forb | perennial |
| Iris orientalis | Iridaceae | Asian Iris | IRIORI | non-native | 0 | 5 | forb | perennial |
| Iris pallida | Iridaceae | Sweet Iris | IRIPAL | non-native | 0 | 5 | forb | perennial |
| Iris pseudoacorus | Iridaceae | Yellow Iris | IRIPSE | non-native | 0 | -5 | forb | perennial |
| Iris pumila | Iridaceae | Dwarf Bearded Iris | IRIPUM | non-native | 0 | 5 | forb | perennial |
| Iris verna | Iridaceae | Early Iris | IRIVER | non-native | 0 | 5 | forb | perennial |
| Iris virginica var. shrevei | Iridaceae | Blue Flag | IRIVIR | native | 6 | -5 | forb | perennial |
| Isatis tinctoria | Brassicaceae | Woad | ISATIN | non-native | 0 | 5 | forb | perennial |
| Isoetes butleri | Isoetaceae | Butlers Quillwort | ISOBUT | native | 8 | -5 | fern | perennial |
| Isoetes engelmannii | Isoetaceae | Engelmanns Quillwort | ISOENG | native | 10 | -5 | fern | perennial |
| Isoetes melanopoda | Isoetaceae | Quillwort | ISOMEL | native | 7 | -5 | fern | perennial |
| Isolepis carinata | Cyperaceae | Keeled Bulrush | ISOCAR | native | 6 | -3 | sedge | annual |
| Isolepis molesta | Cyperaceae | Gulf Coast Bulrush | ISOMOL | native | 8 | -5 | sedge | annual |
| Isopyrum biternatum | Ranunculaceae | False Rue Anemone | ISOBIT | native | 5 | 3 | forb | perennial |
| Isotria medeoloides | Orchidaceae | Small Whorled Pogonia | ISOMED | native | 10 | 3 | forb | perennial |
| Isotria verticillata | Orchidaceae | Large Whorled Pogonia | ISOVER | native | 10 | 3 | forb | perennial |
| Itea virginica | Iteaceae | Virginia Willow | ITEVIR | native | 10 | -5 | shrub | perennial |
| Iva angustifolia | Asteraceae | Narrowleaf Marsh Elder | IVAANG | non-native | 0 | 5 | forb | annual |
| Iva annua | Asteraceae | Marsh Elder | IVAANN | native | 1 | 0 | forb | annual |
| Jacquemontia tamnifolia | Convolvulaceae | Hairy Cluster Vine | JACTAM | non-native | 0 | 3 | forb | annual |
| Jasminum nudiflorum | Oleaceae | Winter Jasmine | JASNUD | non-native | 0 | 5 | shrub | perennial |
| Juglans cinerea | Juglandaceae | Butternut | JUGCIN | native | 7 | 3 | tree | perennial |
| Juglans nigra | Juglandaceae | Black Walnut | JUGNIG | native | 4 | 3 | tree | perennial |
| Juncus acuminatus | Juncaceae | Sharp-Fruited Rush | JUNACU | native | 4 | -5 | forb | perennial |
| Juncus alpinoarticulatus | Juncaceae | Richardsons Rush | JUNALP | native | 10 | -5 | forb | perennial |
| Juncus balticus subsp. littoralis | Juncaceae | Lake Shore Rush | JUNBAL | native | 10 | -5 | forb | perennial |
| Juncus biflorus | Juncaceae | Two-Flowered Rush | JUNBIF | native | 5 | -3 | forb | perennial |
| Juncus brachycarpus | Juncaceae | Short-Fruited Rush | JUNBRC | native | 7 | -3 | forb | perennial |
| Juncus brachyphyllus | Juncaceae | Small-Headed Rush | JUNBRP | native | 7 | 0 | forb | perennial |
| Juncus bufonius | Juncaceae | Toad Rush | JUNBUF | native | 3 | -3 | forb | annual |
| Juncus canadensis | Juncaceae | Canadian Rush | JUNCAN | native | 10 | -5 | forb | perennial |
| Juncus debilis | Juncaceae | Weak Rush | JUNDEB | native | 10 | -5 | forb | perennial |
| Juncus diffusissimus | Juncaceae | Slimpod Rush | JUNDIF | native | 5 | -3 | forb | perennial |
| Juncus dudleyi | Juncaceae | Dudleys Rush | JUNDUD | native | 6 | -3 | forb | perennial |
| Juncus effusus subsp. solutus | Juncaceae | Common Rush | JUNEFF | native | 4 | -5 | forb | perennial |
| Juncus filipendulus | Juncaceae | Glade Rush | JUNFIL | native | 10 | 0 | forb | perennial |
| Juncus gerardii | Juncaceae | Black Grass | JUNGER | non-native | 0 | -5 | forb | perennial |
| Juncus interior | Juncaceae | Inland Rush | JUNINT | native | 5 | 3 | forb | perennial |
| Juncus marginatus | Juncaceae | Grass-Leaved Rush | JUNMAR | native | 4 | -3 | forb | perennial |
| Juncus nodatus | Juncaceae | Stout Rush | JUNNOT | native | 6 | -5 | forb | perennial |
| Juncus nodosus | Juncaceae | Joint Rush | JUNNOS | native | 10 | -5 | forb | perennial |
| Juncus scirpoides | Juncaceae | Round-Leaved Rush | JUNSCI | native | 9 | -3 | forb | perennial |
| Juncus secundus | Juncaceae | Secund Rush | JUNSEC | native | 5 | 3 | forb | perennial |
| Juncus subcaudatus | Juncaceae | Fen Rush | JUNSUB | native | 10 | -5 | forb | perennial |
| Juncus tenuis var. anthelatus | Juncaceae | Path Rush | JUNTEA | native | 2 | 0 | forb | perennial |
| Juncus tenuis var. tenuis | Juncaceae | Path Rush | JUNTET | native | 0 | 0 | forb | perennial |
| Juncus torreyi | Juncaceae | Torreys Rush | JUNTOR | native | 4 | -3 | forb | perennial |
| Juncus validus | Juncaceae | Round-Head Rush | JUNVAL | native | 10 | -3 | forb | perennial |
| Juniperus ashei | Cupressaceae | Ashes Juniper | JUNASH | native | 8 | 5 | tree | perennial |
| Juniperus virginiana | Cupressaceae | Red Cedar | JUNVIR | native | 2 | 3 | tree | perennial |
| Justicia americana | Acanthaceae | Water Willow | JUSAME | native | 5 | -5 | forb | perennial |
| Justicia ovata | Acanthaceae | Loose-Flower Water Willow | JUSOVA | native | 9 | -5 | forb | perennial |
| Kallstroemia parviflora | Zygophyllaceae | Small-Flowered Caltrop | KALPAR | non-native | 0 | 5 | forb | annual |
| Kickxia elatine | Plantaginaceae | Fluellin | KICELA | non-native | 0 | 3 | forb | annual |
| Kickxia spuria | Plantaginaceae | Female Fluellin | KICSPU | non-native | 0 | 5 | forb | annual |
| Knautia arvensis | Dipsacaceae | Field Scabiosa | KNAARV | non-native | 0 | 5 | forb | perennial |
| Kochia scoparia | Chenopodiaceae | Burning Bush | KOCSCO | non-native | 0 | 3 | forb | annual |
| Koeleria macrantha | Poaceae | June Grass | KOEMAC | native | 6 | 5 | grass | perennial |
| Koelrueteria paniculata | Sapindaceae | Golden Rain Tree | KOEPAN | non-native | 0 | 5 | tree | perennial |
| Kolkwitzia amabilis | Caprifoliaceae | Beauty Bush | KOLAMA | non-native | 0 | 5 | shrub | perennial |
| Krigia biflora | Asteraceae | Orange False Dandelion | KRIBIF | native | 5 | 3 | forb | perennial |
| Krigia caespitosa | Asteraceae | Opposite-Leaved Dwarf Dandelion | KRICAE | native | 2 | 3 | forb | annual |
| Krigia dandelion | Asteraceae | Potato Dandelion | KRIDAN | native | 6 | 3 | forb | perennial |
| Krigia occidentalis | Asteraceae | Western Dwarf Dandelion | KRIOCC | native | 7 | 5 | forb | annual |
| Krigia virginica | Asteraceae | Common Dwarf Dandelion | KRIVIR | native | 3 | 5 | forb | annual |
| Kummerowia stipulacea | Fabaceae | Korean Bush Clover | KUMSTI | non-native | 0 | 3 | forb | annual |
| Kummerowia striata | Fabaceae | Japanese Bush Clover | KUMSTR | non-native | 0 | 3 | forb | annual |
| Kyllinga gracillima | Cyperaceae | Pasture Spikesedge | KYLGRA | non-native | 0 | 0 | sedge | perennial |
| Kyllinga pumila | Cyperaceae | Thin-Leaf Flatsedge | KYLPUM | native | 3 | -3 | sedge | annual |
| Lablab purpureus | Fabaceae | Hyacinth Bean | LABPUR | non-native | 0 | 5 | forb | perennial |
| Lactuca canadensis | Asteraceae | Wild Lettuce | LACCAN | native | 3 | 3 | forb | biennial |
| Lactuca floridana | Asteraceae | Blue Lettuce | LACFLO | native | 3 | 3 | forb | biennial |
| Lactuca hirsuta | Asteraceae | Hairy Lettuce | LACHIR | native | 4 | 5 | forb | annual |
| Lactuca ludoviciana | Asteraceae | Western Wild Lettuce | LACLUD | native | 10 | 5 | forb | biennial |
| Lactuca saligna | Asteraceae | Willow Lettuce | LACSAL | non-native | 0 | 3 | forb | biennial |
| Lactuca serriola | Asteraceae | Prickly Lettuce | LACSER | non-native | 0 | 3 | forb | biennial |
| Lactuca tatarica subsp. pulchella | Asteraceae | Showy Blue Lettuce | LACTAT | native | 10 | 0 | forb | perennial |
| Lagenaria siceraria | Cucurbitaceae | Bottle Gourd | LAGSIC | non-native | 0 | 5 | forb | annual |
| Lamium amplexicaule | Lamiaceae | Henbit | LAMAMP | non-native | 0 | 5 | forb | perennial |
| Lamium hybridum | Lamiaceae | Cut-Leaved Dead Nettle | LAMHYB | non-native | 0 | 5 | forb | annual |
| Lamium purpureum | Lamiaceae | Purple Dead Nettle | LAMPUR | non-native | 0 | 5 | forb | perennial |
| Laportea canadensis | Urticaceae | Wood Nettle | LAPCAN | native | 4 | -3 | forb | perennial |
| Lappula redowskii | Boraginaceae | Hairy Stick-Seed | LAPRED | non-native | 0 | 5 | forb | annual |
| Lappula squarrosa | Boraginaceae | Beggars Lice | LAPSQU | non-native | 0 | 5 | forb | annual |
| Lapsana communis | Asteraceae | Nipplewort | LAPCOM | non-native | 0 | 3 | forb | annual |
| Lathyrus hirsutus | Fabaceae | Caley Pea | LATHIR | non-native | 0 | 3 | forb | annual |
| Lathyrus latifolius | Fabaceae | Everlasting Pea | LATLAT | non-native | 0 | 5 | forb | perennial |
| Lathyrus palustris | Fabaceae | Marsh Vetchling | LATPAL | native | 10 | -5 | forb | perennial |
| Lathyrus pusillus | Fabaceae | Singletary Vetchling | LATPUS | native | 10 | 3 | forb | annual |
| Lathyrus sylvestris | Fabaceae | Flat Pea | LATSYL | non-native | 0 | 5 | forb | perennial |
| Lathyrus tuberosus | Fabaceae | Dutch Mice | LATTUB | non-native | 0 | 5 | forb | perennial |
| Lathyrus venosus | Fabaceae | Veiny Pea | LATVEN | native | 8 | 5 | forb | perennial |
| Lavatera trimestris | Malvaceae | Annual Mallow | LAVTRI | non-native | 0 | 5 | forb | annual |
| Leavenworthia uniflora | Brassicaceae | Michauxs Leavenworthia | LEAUNI | native | 7 | 3 | forb | annual |
| Lechea mucronata | Cistaceae | Hairy Pinweed | LECMUC | native | 5 | 5 | forb | perennial |
| Lechea racemulosa | Cistaceae | Narrow-Fruited Pinweed | LECRAC | native | 10 | 5 | forb | perennial |
| Lechea tenuifolia | Cistaceae | Slender-Leaved Pinweed | LECTEN | native | 4 | 5 | forb | perennial |
| Leersia lenticularis | Poaceae | Catchfly Grass | LEELEN | native | 7 | -5 | grass | perennial |
| Leersia oryzoides | Poaceae | Rice Cut Grass | LEEORY | native | 3 | -5 | grass | perennial |
| Leersia virginica var. ovata | Poaceae | White Grass | LEEVIO | native | 7 | -3 | grass | perennial |
| Leersia virginica var. virginica | Poaceae | White Grass | LEEVIV | native | 4 | -3 | grass | perennial |
| Leitneria floridana | Simaroubaceae | Corkwood | LEIFLO | native | 9 | -5 | shrub | perennial |
| Lemna aequinoctialis | Lemnaceae | Lesser Duckweed | LEMAEQ | native | 5 | -5 | forb | perennial |
| Lemna minor | Lemnaceae | Common Duckweed | LEMMIR | native | 4 | -5 | forb | perennial |
| Lemna minuta | Lemnaceae | Least Duckweed | LEMMIT | native | 6 | -5 | forb | perennial |
| Lemna obscura | Lemnaceae | Little Duckweed | LEMOBS | native | 7 | -5 | forb | perennial |
| Lemna perpusilla | Lemnaceae | Minute Duckweed | LEMPER | native | 8 | -5 | forb | perennial |
| Lemna trisulca | Lemnaceae | Forked Duckweed | LEMTRI | native | 10 | -5 | forb | perennial |
| Lemna turionifera | Lemnaceae | Turion Duckweed | LEMTUR | native | 10 | -5 | forb | perennial |
| Lemna valdiviana | Lemnaceae | Pale Duckweed | LEMVAL | native | 7 | -5 | forb | perennial |
| Leontodon taraxacoides | Asteraceae | Lesser Hawkbit | LEOTAR | non-native | 0 | 5 | forb | perennial |
| Leonurus cardiaca | Lamiaceae | Motherwort | LEOCAR | non-native | 0 | 5 | forb | perennial |
| Leonurus japonicus | Lamiaceae | Siberian Motherwort | LEOJAP | non-native | 0 | 5 | forb | biennial |
| Leonurus marrubiastrum | Lamiaceae | Lions Tail | LEOMAR | non-native | 0 | 5 | forb | biennial |
| Lepidium appelianum | Brassicaceae | Hairy Whitetop | LEPAPP | non-native | 0 | 5 | forb | perennial |
| Lepidium campestre | Brassicaceae | Field Cress | LEPCAM | non-native | 0 | 5 | forb | biennial |
| Lepidium chalapense | Brassicaceae | Hoary Cress | LEPCHA | non-native | 0 | 5 | forb | perennial |
| Lepidium densiflorum | Brassicaceae | Small Pepper Cress | LEPDEN | non-native | 0 | 3 | forb | annual |
| Lepidium didymum | Brassicaceae | Wart Cress | LEPDID | non-native | 0 | 5 | forb | annual |
| Lepidium draba | Brassicaceae | Common Whitetop | LEPDRA | non-native | 0 | 5 | forb | perennial |
| Lepidium latifolium | Brassicaceae | Broad-Leaved Pepper Cress | LEPLAT | non-native | 0 | 0 | forb | perennial |
| Lepidium perfoliatum | Brassicaceae | Clasping Cress | LEPPER | non-native | 0 | 3 | forb | annual |
| Lepidium ruderale | Brassicaceae | Stinking Peppercress | LEPRUD | non-native | 0 | 5 | forb | annual |
| Lepidium virginicum | Brassicaceae | Common Pepper Cress | LEPVIR | native | 0 | 3 | forb | annual |
| Leptochloa dubia | Poaceae | Green Sprangletop | LEPDUB | non-native | 0 | 5 | grass | perennial |
| Leptochloa fusca subsp. fascicularis | Poaceae | Bearded Strangletop | LEPFUF | native | 3 | -3 | grass | annual |
| Leptochloa fusca subsp. uninervia | Poaceae | Mexican Sprangletop | LEPFUU | non-native | 0 | -3 | grass | annual |
| Leptochloa panicea subsp. brachiata | Poaceae | Red Sprangletop | LEPPAB | native | 3 | -3 | grass | annual |
| Leptochloa panicea subsp. mucronata | Poaceae | Red Sprangletop | LEPPAM | native | 3 | -3 | grass | annual |
| Leptochloa panicoides | Poaceae | Amazon Strangletop | LEPPAS | native | 5 | -3 | grass | annual |
| Lespedeza bicolor | Fabaceae | Bicolor Lespedeza | LESBIC | non-native | 0 | 5 | forb | perennial |
| Lespedeza capitata | Fabaceae | Round-Headed Bush Clover | LESCAP | native | 6 | 3 | forb | perennial |
| Lespedeza cuneata | Fabaceae | Silky Bush Clover | LESCUN | non-native | 0 | 3 | forb | perennial |
| Lespedeza frutescens | Fabaceae | Violet Bush Clover | LESFRU | native | 5 | 5 | forb | perennial |
| Lespedeza hirta | Fabaceae | Hairy Bush Clover | LESHIR | native | 7 | 5 | forb | perennial |
| Lespedeza prairea | Fabaceae | Tallgrass Bush Clover | LESPRA | native | 7 | 5 | forb | perennial |
| Lespedeza procumbens | Fabaceae | Trailing Bush Clover | LESPRO | native | 4 | 5 | forb | perennial |
| Lespedeza repens | Fabaceae | Creeping Bush Clover | LESREP | native | 4 | 5 | forb | perennial |
| Lespedeza stuevei | Fabaceae | Stueves Bush Clover | LESSTU | native | 7 | 5 | forb | perennial |
| Lespedeza thunbergii | Fabaceae | Tall Bush Clover | LESTHU | non-native | 0 | 5 | forb | perennial |
| Lespedeza violacea | Fabaceae | Wandlike Bush Clover | LESVIO | native | 6 | 5 | forb | perennial |
| Lespedeza virginica | Fabaceae | Slender Bush Clover | LESVIR | native | 5 | 5 | forb | perennial |
| Leucanthemum vulgare | Asteraceae | Ox-Eye Daisy | LEUVUL | non-native | 0 | 5 | forb | perennial |
| Leucojum aestivum | Liliaceae | Snowflake | LEUAES | non-native | 0 | 5 | forb | perennial |
| Leucospora multifida | Plantaginaceae | Obe-Wan-Conobea | LEUMUL | native | 3 | -3 | forb | annual |
| Levisticum officinale | Apiaceae | Lovage | LEVOFF | non-native | 0 | 5 | forb | perennial |
| Liatris aspera | Asteraceae | Rough Blazing Star | LIAASP | native | 6 | 5 | forb | perennial |
| Liatris cylindracea | Asteraceae | Cylindrical Blazing Star | LIACYL | native | 7 | 5 | forb | perennial |
| Liatris mucronata | Asteraceae | Narrow-Leaf Gayfeather | LIAMUC | native | 10 | 5 | forb | perennial |
| Liatris punctata | Asteraceae | Dotted Blazing Star | LIAPUN | native | 10 | 5 | forb | perennial |
| Liatris pycnostachya | Asteraceae | Prairie Blazing Star | LIAPYC | native | 6 | 0 | forb | perennial |
| Liatris scariosa var. nieuwlandii | Asteraceae | Blazing Star | LIASCA | native | 9 | 5 | forb | perennial |
| Liatris spicata | Asteraceae | Marsh Blazing Star | LIASPI | native | 10 | 0 | forb | perennial |
| Liatris squarrosa var. hirsuta | Asteraceae | Hairy Blazing Star | LIASQH | native | 6 | 5 | forb | perennial |
| Liatris squarrosa var. squarrosa | Asteraceae | Scaly Blazing Star | LIASQS | native | 6 | 5 | forb | perennial |
| Liatris squarrulosa | Asteraceae | Scabrous Blazing Star | LIASQL | native | 8 | 5 | forb | perennial |
| Ligusticum canadense | Apiaceae | Angelico | LIGCAN | native | 8 | 0 | forb | perennial |
| Ligustrum obtusifolium | Oleaceae | Border Privet | LIGOBT | non-native | 0 | 5 | shrub | perennial |
| Ligustrum ovalifolium | Oleaceae | California Privet | LIGOVA | non-native | 0 | 5 | shrub | perennial |
| Ligustrum sinense | Oleaceae | Chinese Privet | LIGSIN | non-native | 0 | 3 | shrub | perennial |
| Ligustrum vulgare | Oleaceae | European Privet | LIGVUL | non-native | 0 | 3 | shrub | perennial |
| Lilium lancifolium | Liliaceae | Tiger Lily | LILLAN | non-native | 0 | 5 | forb | perennial |
| Lilium michiganense | Liliaceae | Michigan Lily | LILMIC | native | 7 | -3 | forb | perennial |
| Lilium philadelphicum var. andinum | Liliaceae | Prairie Lily | LILPHI | native | 10 | 3 | forb | perennial |
| Lilium superbum | Liliaceae | Turks-Cap Lily | LILSUP | native | 10 | -3 | forb | perennial |
| Limnobium spongia | Hydrocharitaceae | American Frogbit | LIMSPO | native | 10 | -5 | forb | perennial |
| Limnosciadium pinnatum | Apiaceae | Pinnate Cynosciadium | LIMPIN | native | 7 | -3 | forb | annual |
| Linaria vulgaris | Plantaginaceae | Butter-And-Eggs | LINVUL | non-native | 0 | 5 | forb | perennial |
| Lindera benzoin | Lauraceae | Spicebush | LINBEN | native | 5 | 0 | shrub | perennial |
| Lindera melissifolia | Lauraceae | Pond Berry | LINMEL | native | 10 | -5 | shrub | perennial |
| Lindernia dubia var. anagallidea | Linderniaceae | Slender False Pimpernel | LINDUA | native | 4 | -5 | forb | annual |
| Lindernia dubia var. dubia | Linderniaceae | Slender False Pimpernel | LINDUD | native | 4 | -5 | forb | annual |
| Linum floridanum | Linaceae | Florida Yellow Flax | LINFLO | native | 10 | 0 | forb | perennial |
| Linum medium var. texanum | Linaceae | Small Yellow Flax | LINMED | native | 5 | 3 | forb | perennial |
| Linum rigidum | Linaceae | Stiff-Stem Flax | LINRIG | non-native | 0 | 5 | forb | annual |
| Linum striatum | Linaceae | Stiff Yellow Flax | LINSTR | native | 6 | -3 | forb | perennial |
| Linum sulcatum | Linaceae | Grooved Yellow Flax | LINSUL | native | 5 | 5 | forb | annual |
| Linum usitatissimum | Linaceae | Common Flax | LINUSI | non-native | 0 | 5 | forb | annual |
| Linum virginianum | Linaceae | Woodland Yellow Flax | LINVIR | native | 10 | 0 | forb | perennial |
| Liparis liliifolia | Orchidaceae | Purple Twayblade | LIPLIL | native | 7 | 3 | forb | perennial |
| Liparis loeselii | Orchidaceae | Green Twayblade | LIPLOE | native | 10 | -3 | forb | perennial |
| Lipocarpha aristulata | Cyperaceae | Glade Dwarf Bulrush | LIPARI | native | 7 | -3 | sedge | annual |
| Lipocarpha drummondii | Cyperaceae | Sand Dwarf Bulrush | LIPDRU | native | 8 | -3 | sedge | annual |
| Lipocarpha micrantha | Cyperaceae | Common Dwarf Bulrush | LIPMIC | native | 5 | -3 | sedge | annual |
| Lippia lanceolata | Verbenaceae | Fog Fruit | LIPLAN | native | 3 | -5 | forb | perennial |
| Lippia nodiflora | Verbenaceae | Common Fog Fruit | LIPNOD | native | 10 | -3 | forb | perennial |
| Liquidamber styraciflua | Hamamelidaceae | Sweet Gum | LIQSTY | native | 6 | 0 | tree | perennial |
| Liriodendron tulipifera | Magnoliaceae | Tulip Tree | LIRTUL | native | 7 | 3 | tree | perennial |
| Liriope muscari | Liliaceae | Big Blue Lilyturf | LIRMUS | non-native | 0 | 5 | forb | perennial |
| Liriope spicata | Liliaceae | Creeping Lilyturf | LIRSPI | non-native | 0 | 5 | forb | perennial |
| Listera australis | Orchidaceae | Southern Twayblade | LISAUS | native | 10 | -3 | forb | perennial |
| Lithospermum canescens | Boraginaceae | Hoary Puccoon | LITCAN | native | 6 | 5 | forb | perennial |
| Lithospermum carolinense | Boraginaceae | Hairy Puccoon | LITCAR | native | 7 | 5 | forb | perennial |
| Lithospermum incisum | Boraginaceae | Fringed Puccoon | LITINC | native | 7 | 5 | forb | perennial |
| Lithospermum latifolium | Boraginaceae | Broad-Leaved Puccoon | LITLAT | native | 9 | 5 | forb | perennial |
| Lobelia cardinalis | Campanulaceae | Cardinal Flower | LOBCAR | native | 6 | -3 | forb | perennial |
| Lobelia inflata | Campanulaceae | Indian Tobacco | LOBINF | native | 3 | 3 | forb | annual |
| Lobelia puberula | Campanulaceae | Downy Lobelia | LOBPUB | native | 10 | -3 | forb | perennial |
| Lobelia siphilitica | Campanulaceae | Great Blue Lobelia | LOBSIP | native | 4 | -5 | forb | perennial |
| Lobelia spicata | Campanulaceae | Pale Spiked Lobelia | LOBSPI | native | 5 | 0 | forb | perennial |
| Lobularia maritima | Brassicaceae | Sweet Alyssum | LOBMAR | non-native | 0 | 5 | forb | perennial |
| Lolium perenne var. aristatum | Poaceae | Italian Rye Grass | LOLPEA | non-native | 0 | 3 | grass | annual |
| Lolium perenne var. perenne | Poaceae | Perennial Rye Grass | LOLPEP | non-native | 0 | 3 | grass | perennial |
| Lolium persicum | Poaceae | Asian Rye Grass | LOLPES | non-native | 0 | 5 | grass | annual |
| Lolium rigidum | Poaceae | Swiss Rye Grass | LOLRIG | non-native | 0 | 5 | grass | perennial |
| Lolium temulentum | Poaceae | Darnel | LOLTEM | non-native | 0 | 5 | grass | annual |
| Lomatium foeniculaceum | Apiaceae | Hairy Parsley | LOMFOE | native | 9 | 5 | forb | perennial |
| Lonicera dioica | Caprifoliaceae | Red Honeysuckle | LONDIO | native | 8 | 3 | vine | perennial |
| Lonicera flava | Caprifoliaceae | Yellow Honeysuckle | LONFLA | native | 7 | 5 | vine | perennial |
| Lonicera fragrantissima | Caprifoliaceae | Winter Honeysuckle | LONFRA | non-native | 0 | 5 | shrub | perennial |
| Lonicera japonica | Caprifoliaceae | Japanese Honeysuckle | LONJAP | non-native | 0 | 3 | vine | perennial |
| Lonicera maackii | Caprifoliaceae | Amur Honeysuckle | LONMAA | non-native | 0 | 5 | shrub | perennial |
| Lonicera reticulata | Caprifoliaceae | Grape Honeysuckle | LONRET | native | 8 | 5 | vine | perennial |
| Lonicera sempervirens | Caprifoliaceae | Trumpet Honeysuckle | LONSEM | non-native | 0 | 3 | vine | perennial |
| Lonicera x bella | Caprifoliaceae | Showy Fly Honeysuckle | LONBEL | non-native | 0 | 3 | shrub | perennial |
| Lonicera x perpusii | Caprifoliaceae | Garden Honeysuckle | LONPER | non-native | 0 | 5 | shrub | perennial |
| Lotus corniculatus | Fabaceae | Birds Foot Trefoil | LOTCOR | non-native | 0 | 3 | forb | perennial |
| Ludwigia alternifolia | Onagraceae | Seedbox | LUDALT | native | 4 | -5 | forb | perennial |
| Ludwigia decurrens | Onagraceae | Primrose Willow | LUDDEC | native | 6 | -5 | forb | perennial |
| Ludwigia glandulosa | Onagraceae | Small-Flowered Water-Primrose | LUDGLA | native | 8 | -5 | forb | perennial |
| Ludwigia grandiflora | Onagraceae | Uruguay Primrose Willow | LUDGRA | non-native | 0 | -5 | forb | perennial |
| Ludwigia leptocarpa | Onagraceae | Hairy Primrose Willow | LUDLEP | native | 10 | -5 | forb | perennial |
| Ludwigia linearis | Onagraceae | Narrow-Leaved Primrose Willow | LUDLIN | native | 10 | -5 | forb | perennial |
| Ludwigia microcarpa | Onagraceae | Small-Fruited False Loosestrife | LUDMIC | native | 10 | -5 | forb | perennial |
| Ludwigia palustris | Onagraceae | Marsh Purslane | LUDPAL | native | 4 | -5 | forb | perennial |
| Ludwigia peploides subsp. glabrescens | Onagraceae | Creeping Primrose Willow | LUDPEP | native | 3 | -5 | forb | perennial |
| Ludwigia polycarpa | Onagraceae | False Loosestrife | LUDPOL | native | 6 | -5 | forb | perennial |
| Lunaria annua | Brassicaceae | Money Plant | LUNANN | non-native | 0 | 5 | forb | biennial |
| Luzula campestris var. bulbosa | Juncaceae | Wood Rush | LUZCAB | native | 4 | 3 | forb | perennial |
| Luzula campestris var. echinata | Juncaceae | Wood Rush | LUZCAE | native | 4 | 3 | forb | perennial |
| Luzula campestris var. multiflora | Juncaceae | Wood Rush | LUZCAU | native | 4 | 3 | forb | perennial |
| Lychnis coronaria | Caryophyllaceae | Mullein Pink | LYCCOR | non-native | 0 | 5 | forb | perennial |
| Lycium barbarum | Solanaceae | Matrimony Vine | LYCBAR | non-native | 0 | 5 | shrub | perennial |
| Lycium chinense | Solanaceae | Chinese Matrimony Vine | LYCCHI | non-native | 0 | 5 | shrub | perennial |
| Lycopodium dendroideum | Lycopodiaceae | Round-Branched Clubmoss | LYCDEN | native | 10 | 5 | fern | perennial |
| Lycopodium digitatum | Lycopodiaceae | Southern Ground-Cedar | LYCDIG | native | 8 | 5 | fern | perennial |
| Lycopodium tristachyum | Lycopodiaceae | Ground Cedar | LYCTRI | native | 10 | 5 | fern | perennial |
| Lycopus americanus | Lamiaceae | Common Water Horehound | LYCAME | native | 4 | -5 | forb | perennial |
| Lycopus asper | Lamiaceae | Rough Water Horehound | LYCASP | native | 10 | -5 | forb | perennial |
| Lycopus rubellus | Lamiaceae | Stalked Water Horehound | LYCRUB | native | 6 | -5 | forb | perennial |
| Lycopus uniflorus | Lamiaceae | Northern Bugleweed | LYCUNI | native | 8 | -5 | forb | perennial |
| Lycopus virginicus | Lamiaceae | Bugle Weed | LYCVIR | native | 5 | -5 | forb | perennial |
| Lygodesmia juncea | Asteraceae | Skeleton Plant | LYGJUN | native | 10 | 5 | forb | perennial |
| Lyonia mariana | Ericaceae | Stagger Bush | LYOMAR | native | 10 | 0 | shrub | perennial |
| Lysimachia ciliata | Primulaceae | Fringed Loosestrife | LYSCIL | native | 5 | -3 | forb | perennial |
| Lysimachia hybrida | Primulaceae | Hybrid Loosestrife | LYSHYB | native | 7 | -5 | forb | perennial |
| Lysimachia lanceolata | Primulaceae | Lance-Leaved Loosestrife | LYSLAN | native | 4 | 0 | forb | perennial |
| Lysimachia nummularia | Primulaceae | Moneywort | LYSNUM | non-native | 0 | -3 | forb | perennial |
| Lysimachia quadriflora | Primulaceae | Narrow-Leaved Loosestrife | LYSQUA | native | 8 | -5 | forb | perennial |
| Lysimachia radicans | Primulaceae | Creeping Loosestrife | LYSRAD | native | 10 | -5 | forb | perennial |
| Lysimachia terrestris | Primulaceae | Swamp Candles | LYSTER | native | 10 | -5 | forb | perennial |
| Lysimachia thyrsiflora | Primulaceae | Tufted Loosestrife | LYSTHY | native | 10 | -5 | forb | perennial |
| Lysimachia vulgaris | Primulaceae | Garden Loosestrife | LYSVUL | non-native | 0 | 0 | forb | perennial |
| Lythrum alatum | Lythraceae | Winged Loosestrife | LYTALA | native | 6 | -5 | forb | perennial |
| Lythrum salicaria | Lythraceae | Purple Loosestrife | LYTSAL | non-native | 0 | -5 | forb | perennial |
| Maclura pomifera | Moraceae | Osage Orange | MACPOM | non-native | 0 | 3 | tree | perennial |
| Magnolia acuminata | Magnoliaceae | Cucumber Tree | MAGACU | native | 7 | 3 | tree | perennial |
| Magnolia tripetala | Magnoliaceae | Umbrella Tree | MAGTRI | non-native | 0 | 3 | tree | perennial |
| Maianthemum racemosum | Liliaceae | Feathery False Solomons Seal | MAIRAC | native | 4 | 3 | forb | perennial |
| Maianthemum stellatum | Liliaceae | Starry False Solomons Seal | MAISTE | native | 7 | 0 | forb | perennial |
| Malaxis unifolia | Orchidaceae | Green Adders Mouth | MALUNI | native | 9 | 0 | forb | perennial |
| Malus angustifolia | Rosaceae | Wild Crab | MALUAN | native | 10 | 5 | tree | perennial |
| Malus baccata | Rosaceae | Siberian Crab | MALBAC | non-native | 0 | 5 | tree | perennial |
| Malus coronaria | Rosaceae | Wild Sweet Crab | MALCOR | native | 5 | 5 | tree | perennial |
| Malus domestica | Rosaceae | Apple | MALDOM | non-native | 0 | 5 | tree | perennial |
| Malus floribunda | Rosaceae | Japanese Crab | MALFLO | non-native | 0 | 5 | tree | perennial |
| Malus ioensis | Rosaceae | Iowa Crab | MALIOE | native | 3 | 5 | tree | perennial |
| Malus sieboldii | Rosaceae | Toringo Crab | MALSIE | non-native | 0 | 5 | shrub | perennial |
| Malus x soulardii | Rosaceae | Soulard Crab | MALSOU | non-native | 0 | 5 | tree | perennial |
| Malva moschata | Malvaceae | Musk Mallow | MALMOS | non-native | 0 | 5 | forb | perennial |
| Malva neglecta | Malvaceae | Common Mallow | MALNEG | non-native | 0 | 5 | forb | biennial |
| Malva parviflora | Malvaceae | Little Mallow | MALPAR | non-native | 0 | 5 | forb | annual |
| Malva pusilla | Malvaceae | Round-Leaved Mallow | MALPUS | non-native | 0 | 5 | forb | annual |
| Malvastrum angustum | Malvaceae | False Mallow | MALVAN | native | 6 | 5 | forb | annual |
| Malva sylvestris | Malvaceae | High Mallow | MALSYL | non-native | 0 | 5 | forb | biennial |
| Malva verticillata | Malvaceae | Curled Mallow | MALVER | non-native | 0 | 5 | forb | annual |
| Manfreda virginica | Agavaceae | American Aloe | MANVIR | native | 7 | 5 | forb | perennial |
| Marrubium vulgare | Lamiaceae | Horehound | MARVUL | non-native | 0 | 3 | forb | perennial |
| Marshallia caespitosa var. caespitosa | Asteraceae | Barbaras Buttons | MARCAC | native | 9 | 5 | forb | perennial |
| Marshallia caespitosa var. signata | Asteraceae | Narrow-Leaved Barbaras Buttons | MARCAS | native | 10 | 5 | forb | perennial |
| Marsilea mutica | Marsileaceae | Australian Water Clover | MARMUT | non-native | 0 | -5 | sedge | perennial |
| Marsilea quadrifolia | Marsileaceae | European Water-Clover | MARQUA | non-native | 0 | -5 | sedge | perennial |
| Matelea baldwyniana | Asclepiadaceae | White Climbing Milkweed | MATBAL | native | 8 | 5 | forb | perennial |
| Matelea decipiens | Asclepiadaceae | Climbing Milkweed | MATDEC | native | 5 | 5 | forb | perennial |
| Matricaria chamomilla | Asteraceae | Chamomile | MATCHA | non-native | 0 | 5 | forb | annual |
| Matricaria discoidea | Asteraceae | Pineapple Weed | MATDIS | non-native | 0 | 3 | forb | annual |
| Matteuccia struthiopteris var. pensylvanica | Dryopteridaceae | Ostrich Fern | MATSTR | native | 8 | -3 | fern | perennial |
| Mazus pumilus | Phrymaceae | Japanese Magus | MAZPUM | non-native | 0 | 3 | forb | perennial |
| Mecardonia acuminata | Plantaginaceae | Bracted Water Hyssop | MECACU | native | 10 | -5 | forb | perennial |
| Medeola virginiana | Liliaceae | Indian Cucumber Root | MEDVIR | native | 10 | 3 | forb | perennial |
| Medicago arabica | Fabaceae | Spotted Medick | MEDARA | non-native | 0 | 5 | forb | annual |
| Medicago lupulina | Fabaceae | Black Medick | MEDLUP | non-native | 0 | 3 | forb | annual |
| Medicago minima | Fabaceae | Tiny Bur Clover | MEDMIN | non-native | 0 | 5 | forb | annual |
| Medicago polymorpha | Fabaceae | Bur Clover | MEDPOL | non-native | 0 | 3 | forb | annual |
| Medicago sativa | Fabaceae | Alfalfa | MEDSAT | non-native | 0 | 5 | forb | perennial |
| Melampodium cinereum var. ramosissimum | Asteraceae | Hoary Blackfoot | MELCIN | non-native | 0 | 5 | forb | perennial |
| Melanthium virginicum | Liliaceae | Bunch Flower | MELVIR | native | 9 | -3 | forb | perennial |
| Melia azedarach | Meliaceae | Chinaberry Tree | MELAZE | non-native | 0 | 5 | tree | perennial |
| Melica mutica | Poaceae | Narrow Melic Grass | MELMUT | native | 10 | 5 | grass | perennial |
| Melica nitens | Poaceae | Tall Melic Grass | MELNIT | native | 6 | 5 | grass | perennial |
| Melilotus albus | Fabaceae | White Sweet Clover | MELALB | non-native | 0 | 3 | forb | biennial |
| Melilotus officinale | Fabaceae | Yellow Sweet Clover | MELOFF | non-native | 0 | 3 | forb | biennial |
| Melissa officinalis | Lamiaceae | Common Balm | MELOFS | non-native | 0 | 5 | forb | perennial |
| Melochia corchorifolia | Malvaceae | Chocolate Weed | MELCOR | non-native | 0 | 3 | forb | annual |
| Melothria pendula | Cucurbitaceae | Creeping Cucumber | MELPEN | native | 8 | 0 | forb | perennial |
| Menispermum canadense | Menispermaceae | Moonseed | MENICA | native | 4 | 3 | vine | perennial |
| Mentha aquatica var. citrata | Lamiaceae | Lemon Mint | MENAQU | non-native | 0 | -5 | forb | perennial |
| Mentha canadensis | Lamiaceae | Wild Mint | MENTCA | native | 5 | -3 | forb | perennial |
| Mentha longifolia | Lamiaceae | Wavy Mint | MENLON | non-native | 0 | -3 | forb | perennial |
| Mentha spicata | Lamiaceae | Spearmint | MENSPI | non-native | 0 | -3 | forb | perennial |
| Mentha x gracilis | Lamiaceae | Little-Leaved Mint | MENGRA | non-native | 0 | -3 | forb | perennial |
| Mentha x piperita | Lamiaceae | Peppermint | MENPIP | non-native | 0 | -3 | forb | perennial |
| Mentzelia albescens | Loasaceae | Wavyleaf Stickleaf | MENALB | non-native | 0 | 5 | forb | perennial |
| Mentzelia nuda | Loasaceae | Bractless Stickleaf | MENNUD | non-native | 0 | 5 | forb | perennial |
| Mentzelia oligosperma | Loasaceae | Glade Stickleaf | MENOLI | native | 6 | 5 | forb | perennial |
| Menyanthes trifoliata | Menyanthaceae | Buckbean | MENTRI | native | 10 | -5 | forb | perennial |
| Mertensia virginica | Boraginaceae | Virginia Bluebells | MERVIR | native | 6 | 0 | forb | perennial |
| Micranthes pensylvanica var. forbesii | Saxifragaceae | Swamp Saxifrage | MICPEN | native | 10 | 0 | forb | perennial |
| Micranthes texana | Saxifragaceae | Texas Saxifrage | MICTEX | native | 9 | 5 | forb | perennial |
| Micranthes virginiensis | Saxifragaceae | Early Saxifrage | MICVIR | native | 7 | 3 | forb | perennial |
| Microstegium vimineum | Poaceae | Eulalia | MICVIM | non-native | 0 | 0 | grass | annual |
| Microthlaspi perfoliatum | Brassicaceae | Perfoliate Pennycress | MICPER | non-native | 0 | 5 | forb | annual |
| Mikania scandens | Asteraceae | Climbing Hempweed | MIKSCA | native | 5 | -5 | forb | perennial |
| Mimosa quadrivalvis var. nuttallii | Fabaceae | Sensitive Briar | MIMQUA | native | 6 | 5 | forb | perennial |
| Mimulus alatus | Phrymaceae | Winged Monkey Flower | MIMALA | native | 5 | -5 | forb | perennial |
| Mimulus glabratus | Phrymaceae | Yellow Monkey Flower | MIMGLA | native | 10 | -5 | forb | perennial |
| Mimulus ringens | Phrymaceae | Monkey Flower | MIMRIN | native | 5 | -5 | forb | perennial |
| Minuartia michauxii | Caryophyllaceae | Stiff Sandwort | MINMIC | native | 9 | 5 | forb | perennial |
| Minuartia muscorum | Caryophyllaceae | Pitchers Sandwort | MINMUS | native | 10 | 3 | forb | annual |
| Minuartia patula | Caryophyllaceae | Slender Sandwort | MINPAT | native | 7 | 5 | forb | annual |
| Mirabilis albida | Nyctaginaceae | Pale Umbrellawort | MIRALB | native | 5 | 5 | forb | perennial |
| Mirabilis linearis | Nyctaginaceae | Narrow-Leaved Umbrellawort | MIRLIN | native | 8 | 5 | forb | perennial |
| Mirabilis nyctaginea | Nyctaginaceae | Wild Four Oclock | MIRNYC | native | 0 | 3 | forb | perennial |
| Miscanthus sacchariflorus | Poaceae | Amur Silvergrass | MISSAC | non-native | 0 | 5 | grass | perennial |
| Miscanthus sinensis | Poaceae | Silver Grass | MISSIN | non-native | 0 | 5 | grass | perennial |
| Mitchella repens | Rubiaceae | Partridge Berry | MITREP | native | 7 | 3 | forb | perennial |
| Mitella diphylla | Saxifragaceae | Bishops Cap | MITDIP | native | 8 | 3 | forb | perennial |
| Mitreola petiolata | Loganiaceae | Miterwort | MITPET | native | 10 | -3 | forb | annual |
| Moehringia lateriflora | Caryophyllaceae | Grove Sandwort | MOELAT | native | 10 | 3 | forb | perennial |
| Mollugo verticillata | Molluginaceae | Carpet Weed | MOLVER | non-native | 0 | 0 | forb | annual |
| Monarda bradburiana | Lamiaceae | Bradbury Bee Balm | MONBRA | native | 5 | 5 | forb | perennial |
| Monarda citriodora | Lamiaceae | Lemon Bee Balm | MONCIT | native | 8 | 5 | forb | annual |
| Monarda clinopodia | Lamiaceae | Basil Bee Balm | MONCLI | native | 10 | 3 | forb | perennial |
| Monarda didyma | Lamiaceae | Oswego Tea | MONDID | non-native | 0 | 3 | forb | perennial |
| Monarda fistulosa | Lamiaceae | Wild Bergamot | MONFIS | native | 4 | 3 | forb | perennial |
| Monarda pectinata | Lamiaceae | Plains Bee Balm | MONPEC | non-native | 0 | 5 | forb | annual |
| Monarda punctata var. arkansana | Lamiaceae | Arkansas Bee Balm | MONPUA | native | 10 | 5 | forb | perennial |
| Monarda punctata var. occidentalis | Lamiaceae | Spotted Bee Balm | MONPUO | non-native | 0 | 5 | forb | perennial |
| Monarda punctata var. villicaulis | Lamiaceae | Horsemint | MONPUV | native | 7 | 5 | forb | perennial |
| Monolepis nuttalliana | Chenopodiaceae | Poverty Weed | MONNUT | non-native | 0 | 5 | forb | annual |
| Monotropa hypopitys | Ericaceae | Pinesap | MONHYP | native | 8 | 5 | forb | perennial |
| Monotropa uniflora | Ericaceae | Indian Pipe | MONUNI | native | 7 | 3 | forb | perennial |
| Morus alba | Moraceae | White Mulberry | MORALB | non-native | 0 | 3 | tree | perennial |
| Morus rubra | Moraceae | Red Mulberry | MORRUB | native | 4 | 3 | tree | perennial |
| Muhlenbergia asperifolia | Poaceae | Scratch Grass | MUHASP | native | 1 | -3 | grass | perennial |
| Muhlenbergia bushii | Poaceae | Short-Leaved Satin Grass | MUHBUS | native | 6 | 5 | grass | perennial |
| Muhlenbergia capillaris | Poaceae | Pink Satin Grass | MUHCAP | native | 9 | 3 | grass | perennial |
| Muhlenbergia cuspidata | Poaceae | Prairie Satin Grass | MUHCUS | native | 10 | 5 | grass | perennial |
| Muhlenbergia frondosa | Poaceae | Common Satin Grass | MUHFRO | native | 3 | 0 | grass | perennial |
| Muhlenbergia glabrifloris | Poaceae | Smooth Satin Grass | MUHGLA | native | 7 | 5 | grass | perennial |
| Muhlenbergia mexicana | Poaceae | Leafy Satin Grass | MUHMEX | native | 6 | 0 | grass | perennial |
| Muhlenbergia racemosa | Poaceae | Upland Wild Timothy | MUHRAC | native | 4 | -3 | grass | perennial |
| Muhlenbergia schreberi | Poaceae | Nimblewill | MUHSCH | native | 0 | 0 | grass | perennial |
| Muhlenbergia sobolifera | Poaceae | Rock Satin Grass | MUHSOB | native | 4 | 5 | grass | perennial |
| Muhlenbergia sylvatica | Poaceae | Woodland Satin Grass | MUHSYL | native | 5 | -3 | grass | perennial |
| Muhlenbergia tenuiflora | Poaceae | Slender Satin Grass | MUHTEN | native | 6 | 3 | grass | perennial |
| Muscaria racemosum | Liliaceae | Starch Grape Hyacinth | MUSRAC | non-native | 0 | 5 | forb | perennial |
| Muscari botryoides | Liliaceae | Common Grape Hyacinth | MUSBOT | non-native | 0 | 5 | forb | perennial |
| Muscari comosum | Liliaceae | Tassel Grape Hyacinth | MUSCOM | non-native | 0 | 5 | forb | perennial |
| Myosotis macrosperma | Boraginaceae | White Forget-Me-Not | MYOMAC | native | 3 | 0 | forb | annual |
| Myosotis scorpioides | Boraginaceae | Common Forget-Me-Not | MYOSCO | non-native | 0 | -5 | forb | perennial |
| Myosotis stricta | Boraginaceae | Small-Flowered Forget-Me-Not | MYOSTR | non-native | 0 | 5 | forb | annual |
| Myosotis verna | Boraginaceae | Spring Forget-Me-Not | MYOVER | native | 2 | 3 | forb | annual |
| Myosoton aquaticum | Caryophyllaceae | Water Chickweed | MYOAQU | non-native | 0 | -3 | forb | perennial |
| Myosurus minimus | Ranunculaceae | Mousetail | MYOMIN | native | 0 | -3 | forb | annual |
| Myriophyllum aquaticum | Haloragaceae | Parrots Feather | MYRAQU | non-native | 0 | -5 | forb | perennial |
| Myriophyllum heterophyllum | Haloragaceae | Various-Leaved Water Milfoil | MYRHET | native | 8 | -5 | forb | perennial |
| Myriophyllum pinnatum | Haloragaceae | Rough Water Milfoil | MYRPIN | native | 7 | -5 | forb | perennial |
| Myriophyllum sibiricum | Haloragaceae | European Water Milfoil | MYRSIB | non-native | 0 | -5 | forb | perennial |
| Myriophyllum spicatum | Haloragaceae | Pale Water Milfoil | MYRSPI | non-native | 0 | -5 | forb | perennial |
| Najas flexilis | Najadaceae | Slender Naiad | NAJFLE | native | 10 | -5 | forb | annual |
| Najas gracillima | Najadaceae | Slender Water-Nymph | NAJGRA | native | 8 | -5 | forb | annual |
| Najas guadalupensis | Najadaceae | Southern Naiad | NAJGUA | native | 6 | -5 | forb | annual |
| Najas minor | Najadaceae | Brittle Naiad | NAJMIN | non-native | 0 | -5 | forb | annual |
| Narcissus poeticus | Liliaceae | Poets Narcissus | NARPOE | non-native | 0 | 5 | forb | perennial |
| Narcissus pseudo-narcissus | Liliaceae | Daffodil | NARPSE | non-native | 0 | 5 | forb | perennial |
| Nasturtium officinale | Brassicaceae | Water Cress | NASOFF | non-native | 0 | -5 | forb | perennial |
| Nelumbo lutea | Nelumbonaceae | American Lotus | NELLUT | native | 6 | -5 | forb | perennial |
| Nelumbo nucifera | Nelumbonaceae | Sacred Lotus | NELNUC | non-native | 0 | -5 | forb | perennial |
| Nemastylis geminiflora | Iridaceae | Celestial Lily | NEMGEM | native | 10 | 5 | forb | perennial |
| Nemastylis nuttallii | Iridaceae | Nuttalls Prairie Iris | NEMNUT | native | 9 | 5 | forb | perennial |
| Nepeta cataria | Lamiaceae | Catnip | NEPCAT | non-native | 0 | 3 | forb | perennial |
| Neslia paniculata | Brassicaceae | Ball Mustard | NESPAN | non-native | 0 | 5 | forb | annual |
| Neviusia alabamensis | Rosaceae | Snow Wreath | NEVALA | native | 10 | 5 | shrub | perennial |
| Nicandra physalodes | Solanaceae | Apple Of Peru | NICPHY | non-native | 0 | 5 | forb | annual |
| Nicotiana longiflora | Solanaceae | Long-Flowered Tobacco | NICLON | non-native | 0 | 5 | forb | annual |
| Nicotiana rustica | Solanaceae | Wild Tobacco | NICRUS | non-native | 0 | 5 | forb | annual |
| Nicotiana tabacum | Solanaceae | Tobacco | NICTAB | non-native | 0 | 5 | forb | annual |
| Nothocalis cuspidata | Asteraceae | Prairie Dandelion | NOTCUS | native | 10 | 5 | forb | perennial |
| Nothoscordum bivalve | Liliaceae | False Garlic | NOTBIV | native | 4 | 3 | forb | perennial |
| Nuphar advena subsp. advena | Nymphaeaceae | Yellow Pond Lily | NUPADA | native | 6 | -5 | forb | perennial |
| Nuphar advena subsp. ozarkana | Nymphaeaceae | Ozark Spatterdock | NUPADO | native | 6 | -5 | forb | perennial |
| Nuttallanthus canadensis | Plantaginaceae | Small Blue Toadflax | NUTCAN | native | 3 | 5 | forb | annual |
| Nuttallanthus texanus | Plantaginaceae | Large Blue Toadflax | NUTTEX | native | 3 | 5 | forb | annual |
| Nymphaea odorata | Nymphaeaceae | White Water Lily | NYMODO | native | 7 | -5 | forb | perennial |
| Nymphoides peltata | Menyanthaceae | Fragrant Water Lily | NYMPEL | non-native | 0 | -5 | forb | perennial |
| Nyssa aquatica | Cornaceae | Water Tupelo | NYSAQU | native | 10 | -5 | tree | perennial |
| Nyssa biflora | Cornaceae | Swamp Black Gum | NYSBIF | native | 10 | -3 | tree | perennial |
| Nyssa sylvatica | Cornaceae | Black Gum | NYSSYL | native | 5 | 0 | tree | perennial |
| Obolaria virginica | Gentianaceae | Pennywort | OBOVIR | native | 10 | 5 | forb | perennial |
| Ocimum basilicum | Lamiaceae | Basil | OCIBAS | non-native | 0 | 5 | forb | annual |
| Oenanthe javanica | Apiaceae | Water Celery | OENJAV | non-native | 0 | -5 | forb | perennial |
| Oenothera biennis | Onagraceae | Common Evening Primrose | OENBIE | native | 0 | 3 | forb | biennial |
| Oenothera clelandii | Onagraceae | Clelands Evening Primrose | OENCLE | native | 5 | 5 | forb | biennial |
| Oenothera fruticosa subsp. fruticosa | Onagraceae | Sundrops | OENFRF | native | 10 | 3 | forb | perennial |
| Oenothera fruticosa subsp. glauca | Onagraceae | Glandular Snowdrops | OENFRG | native | 10 | 3 | forb | perennial |
| Oenothera grandis | Onagraceae | Showy Ragged Evening Primrose | OENGRA | native | 5 | 5 | forb | annual |
| Oenothera heterophylla | Onagraceae | Four-Point Evening Primrose | OENHET | non-native | 0 | 5 | forb | biennial |
| Oenothera laciniata | Onagraceae | Ragged Evening Primrose | OENLAC | native | 1 | 3 | forb | annual |
| Oenothera linifolia | Onagraceae | Thread-Leaved Sundrops | OENLIN | native | 4 | 5 | forb | annual |
| Oenothera macrocarpa | Onagraceae | Missouri Primrose | OENMAC | native | 7 | 5 | forb | perennial |
| Oenothera nutans | Onagraceae | Nodding Evening Primrose | OENNUT | native | 3 | 5 | forb | biennial |
| Oenothera parviflora | Onagraceae | Northern Evening Primrose | OENPAR | native | 5 | 3 | forb | biennial |
| Oenothera perennis | Onagraceae | Small Sundrops | OENPER | native | 10 | 0 | forb | perennial |
| Oenothera pilosella | Onagraceae | Prairie Sundrops | OENPIL | native | 6 | 0 | forb | perennial |
| Oenothera rhombipetala | Onagraceae | Sand Primrose | OENRHO | native | 5 | 3 | forb | biennial |
| Oenothera speciosa | Onagraceae | Showy Evening Primrose | OENSPE | native | 2 | 5 | forb | perennial |
| Oenothera triloba | Onagraceae | Stemless Evening Primrose | OENTRI | native | 9 | 5 | forb | annual |
| Oenothera villosa | Onagraceae | Hairy Evening Primrose | OENVIL | native | 2 | 3 | forb | biennial |
| Oldenlandia boscii | Rubiaceae | Boscs Bluets | OLDBOS | native | 8 | -3 | forb | perennial |
| Oldenlandia uniflora | Rubiaceae | Clustered Bluets | OLDUNI | native | 10 | -3 | forb | annual |
| Oligoneuron album | Asteraceae | Stiff Aster | OLIALB | native | 9 | 5 | forb | perennial |
| Oligoneuron riddellii | Asteraceae | Riddells Goldenrod | OLIRID | native | 10 | -5 | forb | perennial |
| Oligoneuron rigidum | Asteraceae | Stiff Goldenrod | OLIRIG | native | 5 | 3 | forb | perennial |
| Onoclea sensibilis | Dryopteridaceae | Sensitive Fern | ONOSEN | native | 6 | -3 | fern | perennial |
| Onopordum acanthium | Asteraceae | Scotch Thistle | ONOACA | non-native | 0 | 5 | forb | biennial |
| Onosmodium molle subsp. hispidissimum | Boraginaceae | Marbleseed | ONOMOH | native | 4 | 5 | forb | perennial |
| Onosmodium molle subsp. occidentale | Boraginaceae | False Gromwell | ONOMOO | native | 4 | 5 | forb | perennial |
| Onosmodium molle subsp. subsetosum | Boraginaceae | Ozark False Gromwell | ONOMOS | native | 4 | 5 | forb | perennial |
| Ophioglossum crotalophoroides | Ophioglossaceae | Bulbous Adders Tongue | OPHCRO | native | 6 | 3 | fern | perennial |
| Ophioglossum engelmannii | Ophioglossaceae | Glade Adders Tongue | OPHENG | native | 7 | 3 | fern | perennial |
| Ophioglossum petiolatum | Ophioglossaceae | Stalked Adders Tongue | OPHPET | native | 6 | 0 | fern | perennial |
| Ophioglossum vulgatum | Ophioglossaceae | Adders Tongue | OPHVUL | native | 7 | -3 | fern | perennial |
| Opuntia humifusa | Cactaceae | Eastern Prickly Pear | OPUHUM | native | 4 | 5 | shrub | perennial |
| Opuntia macrorhiza | Cactaceae | Twinspine Prickly Pear | OPUMAC | native | 10 | 5 | shrub | perennial |
| Opuntia polyacantha | Cactaceae | Plains Prickly Pear | OPUPOL | native | 10 | 5 | shrub | perennial |
| Orbexilum onobrychis | Fabaceae | French Grass | ORBONO | native | 7 | 5 | forb | perennial |
| Orbexilum pedunculatum | Fabaceae | Sampsons Snakeroot | ORBPED | native | 6 | 3 | forb | perennial |
| Origanum vulgare | Lamiaceae | Oregano | ORIVUL | non-native | 0 | 5 | forb | perennial |
| Ornithogalum nutans | Liliaceae | Nodding Star-Of-Bethlehem | ORNNUT | non-native | 0 | 5 | forb | perennial |
| Ornithogalum umbellatum | Liliaceae | Star-Of-Bethlehem | ORNUMB | non-native | 0 | 3 | forb | perennial |
| Orobanche ludoviciana | Orobanchaceae | Louisiana Broom Rape | OROLUD | native | 10 | 5 | forb | perennial |
| Orobanche riparia | Orobanchaceae | River Broom Rape | ORORIP | native | 7 | -3 | forb | perennial |
| Orobanche uniflora | Orobanchaceae | One-Flowered Broom Rape | OROUNI | native | 7 | 3 | forb | perennial |
| Oryza sativa | Poaceae | Rice | ORYSAT | non-native | 0 | -5 | grass | annual |
| Oryzopsis racemosa | Poaceae | Black-Seeded Rice Grass | ORYRAC | native | 10 | 5 | grass | perennial |
| Osmorhiza claytonii | Apiaceae | Hairy Sweet Cicely | OSMOCL | native | 3 | 3 | forb | perennial |
| Osmorhiza longistylis | Apiaceae | Smooth Sweet Cicely | OSMOLO | native | 3 | 3 | forb | perennial |
| Osmunda cinnamomea | Osmundaceae | Cinnamon Fern | OSMUCI | native | 8 | -3 | fern | perennial |
| Osmunda claytoniana | Osmundaceae | Interrupted Fern | OSMUCL | native | 7 | 0 | fern | perennial |
| Osmunda regalis var. spectabilis | Osmundaceae | Royal Fern | OSMURE | native | 7 | -5 | fern | perennial |
| Ostrya virginiana | Betulaceae | Ironwood | OSTVIR | native | 4 | 3 | tree | perennial |
| Ottelia alismoides | Hydrocharitaceae | Duck Lettuce | OTTALI | non-native | 0 | -5 | forb | perennial |
| Oxalis corniculata | Oxalidaceae | Creeping Wood Sorrel | OXACOR | non-native | 0 | 3 | forb | perennial |
| Oxalis dillenii | Oxalidaceae | Yellow Wood Sorrel | OXADIL | native | 0 | 3 | forb | perennial |
| Oxalis florida | Oxalidaceae | Swamp Wood Sorrel | OXAFLO | native | 5 | -3 | forb | perennial |
| Oxalis stricta | Oxalidaceae | Common Wood Sorrel | OXASTR | native | 0 | 3 | forb | perennial |
| Oxalis violacea | Oxalidaceae | Violet Wood Sorrel | OXAVIO | native | 5 | 5 | forb | perennial |
| Oxypolis rigidior | Apiaceae | Cowbane | OXYRIG | native | 7 | -5 | forb | perennial |
| Oxytropis lambertii | Fabaceae | Loco Weed | OXYLAM | native | 10 | 3 | forb | perennial |
| Pachysandra procumbens | Buxaceae | Allegheny Spurge | PACPRO | non-native | 0 | 5 | forb | perennial |
| Packera aurea | Asteraceae | Common Golden Ragwort | PACAUR | native | 6 | -3 | forb | perennial |
| Packera glabella | Asteraceae | Butterweed | PACGLA | native | 1 | -3 | forb | annual |
| Packera obovata | Asteraceae | Round-Leaved Ragwort | PACOBO | native | 4 | 3 | forb | perennial |
| Packera paupercula | Asteraceae | Balsam Ragwort | PACPAU | native | 6 | 0 | forb | perennial |
| Packera plattensis | Asteraceae | Prairie Ragwort | PACPLA | native | 6 | 3 | forb | perennial |
| Packera pseudaurea var. semicordata | Asteraceae | Western Golden Ragwort | PACPSE | native | 6 | -3 | forb | perennial |
| Packera tomentosa | Asteraceae | Wooly Ragwort | PACTOM | native | 10 | 3 | forb | perennial |
| Palafoxia callosa | Asteraceae | Small Palafoxia | PALCAL | native | 5 | 5 | forb | annual |
| Panax quinquefolius | Araliaceae | Ginseng | PANQUI | native | 8 | 5 | forb | perennial |
| Panicum anceps | Poaceae | Beaked Panic Grass | PANANC | native | 3 | 0 | grass | perennial |
| Panicum capillare | Poaceae | Old Witch Grass | PANCAP | native | 0 | 0 | grass | annual |
| Panicum dichotomiflorum | Poaceae | Knee Grass | PANDIC | native | 0 | -3 | grass | annual |
| Panicum flexile | Poaceae | Wiry Panic Grass | PANFLE | native | 3 | 3 | grass | annual |
| Panicum gattingeri | Poaceae | Gattingers Witch Grass | PANGAT | native | 4 | 0 | grass | annual |
| Panicum longifolium | Poaceae | Long-Leaved Panic Grass | PANLON | native | 10 | -5 | grass | perennial |
| Panicum miliaceum | Poaceae | Broom-Corn Millet | PANMIL | non-native | 0 | 5 | grass | annual |
| Panicum obtusum | Poaceae | Blunt Panic Grass | PANOBT | non-native | 0 | -3 | grass | perennial |
| Panicum philadelphicum | Poaceae | Philadelphia Panic Grass | PANPHI | native | 4 | 0 | grass | annual |
| Panicum rigidulum | Poaceae | Munro Grass | PANRIG | native | 3 | -3 | grass | perennial |
| Panicum verrucosum | Poaceae | Warty Panic Grass | PANVER | native | 10 | -3 | grass | annual |
| Panicum virgatum | Poaceae | Switch Grass | PANVIR | native | 4 | 0 | grass | perennial |
| Papaver dubium | Papaveraceae | Blind Eyes | PAPDUB | non-native | 0 | 5 | forb | annual |
| Papaver rhoeas | Papaveraceae | Corn Poppy | PAPRHO | non-native | 0 | 5 | forb | annual |
| Papaver somniferum | Papaveraceae | Common Poppy | PAPSOM | non-native | 0 | 5 | forb | annual |
| Parietaria pensylvanica | Urticaceae | Pellitory | PARPEN | native | 3 | 3 | forb | annual |
| Parnassia grandifolia | Parnassiaceae | Grass-Of-Parnassus | PARGRA | native | 10 | -5 | forb | perennial |
| Paronychia canadensis | Caryophyllaceae | Tall Forked Chickweed | PARCAN | native | 4 | 5 | forb | annual |
| Paronychia fastigiata | Caryophyllaceae | Low Forked Chickweed | PARFAS | native | 4 | 5 | forb | annual |
| Paronychia virginica | Caryophyllaceae | Broom Whitlow-Wort | PARVIR | native | 10 | 5 | forb | perennial |
| Parthenium hispidum | Asteraceae | Hairy Feverfew | PARHIS | native | 9 | 5 | forb | perennial |
| Parthenium hysterophorus | Asteraceae | Santa Maria | PARHYS | non-native | 0 | 0 | forb | annual |
| Parthenium integrifolium | Asteraceae | Wild Quinine | PARINT | native | 6 | 5 | forb | perennial |
| Parthenocissus quinquefolia | Vitaceae | Virginia Creeper | PARQUI | native | 3 | 3 | vine | perennial |
| Parthenocissus tricuspidata | Vitaceae | Boston Ivy | PARTRI | non-native | 0 | 5 | vine | perennial |
| Parthenocissus vitacea | Vitaceae | Thicket Creeper | PARVIT | native | 3 | 3 | vine | perennial |
| Pascopyrum smithii | Poaceae | Western Wheat Grass | PASSMI | native | 0 | 5 | grass | perennial |
| Paspalidium geminatum | Poaceae | Water Panic Grass | PASGEM | non-native | 0 | -5 | grass | perennial |
| Paspalum bifidum | Poaceae | Pitchfork Lens Grass | PASBIF | native | 10 | -3 | grass | perennial |
| Paspalum dilatatum | Poaceae | Dallis Grass | PASDIL | non-native | 0 | 0 | grass | perennial |
| Paspalum dissectum | Poaceae | Mudbank Lens Grass | PASDSS | native | 10 | -5 | grass | perennial |
| Paspalum distichum | Poaceae | Knotgrass | PASDST | non-native | 0 | -5 | grass | perennial |
| Paspalum floridanum | Poaceae | Florida Lens Grass | PASFLO | native | 4 | -3 | grass | perennial |
| Paspalum laeve var. circulare | Poaceae | Smooth Lens Grass | PASLAC | native | 3 | 0 | grass | perennial |
| Paspalum laeve var. laeve | Poaceae | Smooth Lens Grass | PASLAL | native | 2 | 0 | grass | perennial |
| Paspalum pubiflorum | Poaceae | Hairy-Flowered Lens Grass | PASPUB | native | 3 | 0 | grass | perennial |
| Paspalum repens | Poaceae | Water Lens Grass | PASREP | native | 5 | -5 | grass | perennial |
| Paspalum setaceum var. ciliatifolium | Poaceae | Hairy Lens Grass | PASSCI | native | 3 | 3 | grass | perennial |
| Paspalum setaceum var. muhlenbergii | Poaceae | Hairy Lens Grass | PASSMU | native | 3 | 3 | grass | perennial |
| Paspalum setaceum var. setaceum | Poaceae | Slender Lens Grass | PASSSE | native | 7 | 3 | grass | perennial |
| Paspalum setaceum var. stramineum | Poaceae | Bushs Lens Grass | PASSST | native | 5 | 3 | grass | perennial |
| Paspalum urvillei | Poaceae | Vasey Grass | PASURV | non-native | 0 | 0 | grass | perennial |
| Passiflora incarnata | Passifloraceae | Passion Flower | PASINC | native | 2 | 5 | forb | perennial |
| Passiflora lutea | Passifloraceae | Yellow Passion Flower | PASLUT | native | 4 | 5 | forb | perennial |
| Pastinaca sativa | Apiaceae | Wild Parsnip | PASSAT | non-native | 0 | 5 | forb | biennial |
| Paulownia tomentosa | Paulowniaceae | Empress Tree | PAUTOM | non-native | 0 | 5 | tree | perennial |
| Pedicularis canadensis | Orobanchaceae | Lousewort | PEDCAN | native | 5 | 3 | forb | perennial |
| Pedicularis lanceolata | Orobanchaceae | Swamp Lousewort | PEDLAN | native | 9 | -5 | forb | perennial |
| Pediomelum argophyllum | Fabaceae | Silvery Scurfy Pea | PEDARG | native | 9 | 5 | forb | perennial |
| Pediomelum esculentum | Fabaceae | Prairie Turnip | PEDESC | native | 10 | 5 | forb | perennial |
| Pediomelum tenuiflorum | Fabaceae | Scurfy Pea | PEDTEN | native | 8 | 5 | forb | perennial |
| Pellaea atropurpurea | Pteridaceae | Purple Cliff Brake | PELATR | native | 7 | 5 | fern | perennial |
| Pellaea glabella | Pteridaceae | Smooth Cliff Brake | PELGLA | native | 9 | 5 | fern | perennial |
| Pellaea x gastonyi | Pteridaceae | Gastonys Cliff Brake | PELGAS | native | 10 | 5 | fern | perennial |
| Peltandra virginica | Araceae | Arrow Arum | PELVIR | native | 10 | -5 | forb | perennial |
| Pennisetum alopecuroides | Poaceae | Fountain Grass | PENALO | non-native | 0 | 5 | grass | perennial |
| Pennisetum americanum | Poaceae | Pearl Millet | PENAME | non-native | 0 | 5 | grass | annual |
| Pennisetum setaceum | Poaceae | Crimson Fountaingrass | PENSET | non-native | 0 | 5 | grass | perennial |
| Penstemon arkansanus | Plantaginaceae | Arkansas Beard-Tongue | PENARK | native | 8 | 5 | forb | perennial |
| Penstemon cobaea var. cobaea | Plantaginaceae | Showy Beard Tongue | PENCOC | native | 10 | 5 | forb | perennial |
| Penstemon cobaea var. purpureus | Plantaginaceae | Cobea Beard-Tongue | PENCOP | native | 10 | 5 | forb | perennial |
| Penstemon digitalis | Plantaginaceae | Foxglove Beard Tongue | PENDIG | native | 3 | 0 | forb | perennial |
| Penstemon grandiflorus | Plantaginaceae | Large-Flowered Beard Tongue | PENGRA | native | 8 | 5 | forb | perennial |
| Penstemon pallidus | Plantaginaceae | Pale Beard Tongue | PENPAL | native | 5 | 5 | forb | perennial |
| Penstemon tenuis | Plantaginaceae | Brazos Beard Tongue | PENTEN | native | 3 | 3 | forb | perennial |
| Penstemon tubaeflorus | Plantaginaceae | Funnel-Form Beard Tongue | PENTUB | native | 6 | 5 | forb | perennial |
| Penthorum sedoides | Penthoraceae | Ditch Stonecrop | PENSED | native | 3 | -5 | forb | perennial |
| Perideridia americana | Apiaceae | American Perideridia | PERIAM | native | 8 | 5 | forb | perennial |
| Perilla frutescens | Lamiaceae | Beefsteak Plant | PERFRU | non-native | 0 | 0 | forb | annual |
| Persicaria amphibia var. emersa | Polygonaceae | Water Knotweed | PERAMM | native | 5 | -5 | forb | perennial |
| Persicaria amphibia var. stipulacea | Polygonaceae | Water Heartsease | PERAMS | native | 8 | -5 | forb | perennial |
| Persicaria arifolia | Polygonaceae | Halberd-Leaved Tearthumb | PERARI | native | 10 | -5 | forb | annual |
| Persicaria bicornis | Polygonaceae | Pink Smartweed | PERBIC | native | 5 | -3 | forb | annual |
| Persicaria glabra | Polygonaceae | Dense-Flowered Smartweed | PERGLA | native | 6 | -5 | forb | perennial |
| Persicaria hydropiper | Polygonaceae | Water Pepper | PERHYR | native | 3 | -5 | forb | annual |
| Persicaria hydropiperoides | Polygonaceae | Mild Water Pepper | PERHYS | native | 4 | -5 | forb | perennial |
| Persicaria lapathifolia | Polygonaceae | Heartsease | PERLAP | native | 0 | 0 | forb | annual |
| Persicaria longiseta | Polygonaceae | Creeping Smartweed | PERLON | non-native | 0 | 3 | forb | annual |
| Persicaria maculosa | Polygonaceae | Ladys Thumb | PERMAC | non-native | 0 | -3 | forb | annual |
| Persicaria orientalis | Polygonaceae | Kiss-Me-Over-The-Garden-Gate | PERORI | non-native | 0 | 3 | forb | annual |
| Persicaria pensylvanica | Polygonaceae | Pennsylvania Knotweed | PERPEN | native | 1 | -3 | forb | annual |
| Persicaria punctata | Polygonaceae | Dotted Smartweed | PERPUN | native | 3 | -5 | forb | annual |
| Persicaria robustior | Polygonaceae | Stout Smartweed | PERROB | native | 9 | -5 | forb | perennial |
| Persicaria sagittata | Polygonaceae | Arrow-Leaved Tearthumb | PERSAG | native | 4 | -5 | forb | annual |
| Persicaria setacea | Polygonaceae | Bog Smartweed | PERSET | native | 5 | -5 | forb | perennial |
| Persicaria virginiana | Polygonaceae | Virginia Knotweed | PERVIR | native | 1 | 0 | forb | perennial |
| Petrohagia prolifera | Caryophyllaceae | Childing Pink | PETPRO | non-native | 0 | 5 | forb | annual |
| Petunia axillaris | Solanaceae | Large White Petunia | PETAXI | non-native | 0 | 5 | forb | annual |
| Petunia integrifolia | Solanaceae | Violet Petunia | PETINT | non-native | 0 | 5 | forb | annual |
| Petunia x atkinsiana | Solanaceae | White Petunia | PETATK | non-native | 0 | 5 | forb | annual |
| Phacelia bipinnatifida | Hydrophyllaceae | Forest Phacelia | PHABIP | native | 5 | 5 | forb | biennial |
| Phacelia covillei | Hydrophyllaceae | Covilles Phacelia | PHACOV | native | 8 | -3 | forb | annual |
| Phacelia gilioides | Hydrophyllaceae | Small-Flowered Phacelia | PHAGIL | native | 3 | 5 | forb | annual |
| Phacelia hirsuta | Hydrophyllaceae | Hairy Phacelia | PHAHIR | native | 4 | 5 | forb | annual |
| Phacelia purshii | Hydrophyllaceae | Miami Mist | PHAPUR | native | 4 | 5 | forb | annual |
| Phacelia ranunculacea | Hydrophyllaceae | Blue Phacelia | PHARAN | native | 6 | -3 | forb | annual |
| Phalaris arundinacea | Poaceae | Reed Canary Grass | PHAARU | non-native | 0 | -3 | grass | perennial |
| Phalaris brachystachys | Poaceae | Shortspike Canary Grass | PHABRA | non-native | 0 | -3 | grass | annual |
| Phalaris canariensis | Poaceae | Canary Grass | PHACAN | non-native | 0 | 3 | grass | annual |
| Phalaris caroliniana | Poaceae | May Grass | PHACAR | native | 1 | -3 | grass | annual |
| Phaseolus lunatus | Fabaceae | Lima Bean | PHALUN | non-native | 0 | 5 | forb | annual |
| Phaseolus polystachios | Fabaceae | Wild Bean | PHAPOL | native | 7 | 5 | forb | perennial |
| Phaseolus vulgaris | Fabaceae | Bush Bean | PHAVUL | non-native | 0 | 5 | forb | annual |
| Phegoteris hexagonoptera | Thelypteridaceae | Broad Beech Fern | PHEHEX | native | 8 | 3 | fern | perennial |
| Phellodendron amurense | Rutaceae | Amur Cork Tree | PHEAMU | non-native | 0 | 5 | tree | perennial |
| Phemeranthus calycinus | Portulacaceae | Fame Flower | PHECAL | native | 8 | 5 | forb | perennial |
| Phemeranthus parviflorus | Portulacaceae | Rock Pink | PHEPAR | native | 10 | 5 | forb | perennial |
| Philadelphus coronarius | Hydrangeaceae | Sweet Mock Orange | PHICOR | non-native | 0 | 5 | shrub | perennial |
| Philadelphus pubescens var. verrucosus | Hydrangeaceae | Hoary Mock Orange | PHIPUB | native | 10 | 5 | shrub | perennial |
| Phleum pratense | Poaceae | Timothy | PHLPRA | non-native | 0 | 3 | grass | perennial |
| Phlox amplifolia | Polemoniaceae | Broadleaf Phlox | PHLAMP | native | 9 | 5 | forb | perennial |
| Phlox bifida | Polemoniaceae | Sand Phlox | PHLBIF | native | 8 | 5 | forb | perennial |
| Phlox divaricata | Polemoniaceae | Blue Phlox | PHLDIV | native | 4 | 3 | forb | perennial |
| Phlox drummondii | Polemoniaceae | Drummond Phlox | PHLDRU | non-native | 0 | 5 | forb | annual |
| Phlox glaberrima subsp. interior | Polemoniaceae | Marsh Phlox | PHLGLA | native | 8 | -3 | forb | perennial |
| Phlox maculata subsp. pyramidalis | Polemoniaceae | Sweet William Phlox | PHLMAC | native | 10 | -3 | forb | perennial |
| Phlox paniculata | Polemoniaceae | Garden Phlox | PHLPAN | native | 3 | 3 | forb | perennial |
| Phlox pilosa subsp. fulgida | Polemoniaceae | Prairie Phlox | PHLPIF | native | 6 | 3 | forb | perennial |
| Phlox pilosa subsp. ozarkana | Polemoniaceae | Prairie Phlox | PHLPIO | native | 6 | 3 | forb | perennial |
| Phlox pilosa subsp. pilosa | Polemoniaceae | Prairie Phlox | PHLPIP | native | 6 | 3 | forb | perennial |
| Phlox subulata | Polemoniaceae | Moss Phlox | PHLSUB | non-native | 0 | 5 | forb | perennial |
| Phoradendron leucarpum | Viscaceae | Mistletoe | PHOLEU | native | 7 | 5 | shrub | perennial |
| Phragmites australis subsp. americanus | Poaceae | American Reed | PHRAUM | native | 6 | -3 | grass | perennial |
| Phragmites australis subsp. australis | Poaceae | Common Reed | PHRAUU | non-native | 0 | -3 | grass | perennial |
| Phryma leptostachya | Phrymaceae | Lopseed | PHRLEP | native | 2 | 5 | forb | perennial |
| Phyllanthus carolinensis | Euphorbiaceae | Carolina Leaf-Flower | PHYCAR | native | 5 | 0 | forb | annual |
| Phyllanthus polygonoides | Euphorbiaceae | Knotweed Leaf-Flower | PHYPOL | native | 10 | 5 | forb | perennial |
| Phyllostachys viridis | Poaceae | Sulphur Bamboo | PHYLVI | non-native | 0 | 5 | grass | perennial |
| Physalis acutifolia | Solanaceae | Wrights Ground Cherry | PHSAAC | non-native | 0 | 5 | forb | annual |
| Physalis alkekengi | Solanaceae | Chinese Lantern Plant | PHSAAL | non-native | 0 | 5 | forb | perennial |
| Physalis angulata | Solanaceae | Cutleaf Ground Cherry | PHSAAN | native | 3 | 3 | forb | annual |
| Physalis cinerascens | Solanaceae | Stellate Ground Cherry | PHSACI | non-native | 0 | 5 | forb | perennial |
| Physalis cordata | Solanaceae | Heart-Leaved Ground Cherry | PHYCOR | native | 5 | 5 | forb | annual |
| Physalis grisea | Solanaceae | Strawberry Tomato | PHSAGR | native | 6 | 5 | forb | annual |
| Physalis heterophylla | Solanaceae | Clammy Ground Cherry | PHSAHE | native | 3 | 5 | forb | perennial |
| Physalis longifolia | Solanaceae | Ground Cherry | PHSALO | native | 2 | 5 | forb | perennial |
| Physalis missouriensis | Solanaceae | Missouri Ground Cherry | PHSAMI | native | 5 | 5 | forb | annual |
| Physalis philadelphica | Solanaceae | Tomatillo | PHSAPH | non-native | 0 | 5 | forb | annual |
| Physalis pubescens | Solanaceae | Downy Ground Cherry | PHSAPB | native | 4 | 5 | forb | annual |
| Physalis pumila | Solanaceae | Prairy Ground Cherry | PHSAPM | native | 6 | 5 | forb | perennial |
| Physalis virginiana | Solanaceae | Lance-Leaved Ground Cherry | PHSAVI | native | 3 | 5 | forb | perennial |
| Physaria filiformis | Brassicaceae | Missouri Bladderpod | PHYFIL | native | 9 | 5 | forb | annual |
| Physaria gracilis | Brassicaceae | Slender Bladderpod | PHYGRA | non-native | 0 | 5 | forb | annual |
| Physocarpus opulifolius var. intermedius | Rosaceae | Ninebark | PHYOPU | native | 5 | -3 | shrub | perennial |
| Physostegia angustifolia | Lamiaceae | Narrow-Leaved Dragonhead | PHYANG | native | 6 | -3 | forb | perennial |
| Physostegia intermedia | Lamiaceae | Slender Dragonhead | PHYINT | native | 10 | -3 | forb | perennial |
| Physostegia virginiana subsp. praemorsa | Lamiaceae | False Dragonhead | PHYVIP | native | 7 | -3 | forb | perennial |
| Physostegia virginiana subsp. virginiana | Lamiaceae | False Dragonhead | PHYVIV | native | 5 | -3 | forb | perennial |
| Phytolacca americana | Phytolaccaceae | Pokeweed | PHYAME | native | 2 | 3 | forb | perennial |
| Picris hieracioides | Asteraceae | Ox Tongue | PICHIE | non-native | 0 | 5 | forb | annual |
| Picris rhagadioloides | Asteraceae | Bitter-Weed | PICRHA | non-native | 0 | 5 | forb | annual |
| Pilea pumila | Urticaceae | Clearweed | PILPUM | native | 4 | -3 | forb | annual |
| Pilularia americana | Marsileaceae | Pillwort | PILAME | native | 6 | -5 | fern | perennial |
| Pinus banksiana | Pinaceae | Jack Pine | PINBAN | non-native | 0 | 3 | tree | perennial |
| Pinus echinata | Pinaceae | Short-Leaf Pine | PINECH | native | 5 | 5 | tree | perennial |
| Pinus nigra | Pinaceae | Austrian Pine | PINNIG | non-native | 0 | 5 | tree | perennial |
| Pinus strobus | Pinaceae | Eastern White Pine | PINSTR | non-native | 0 | 3 | tree | perennial |
| Pinus taeda | Pinaceae | Loblolly Pine | PINTAE | non-native | 0 | 3 | tree | perennial |
| Pinus virginiana | Pinaceae | Scrub Pine | PINVIR | non-native | 0 | 5 | tree | perennial |
| Pistia stratiotes | Araceae | Water Lettuce | PISSTR | non-native | 0 | -5 | forb | perennial |
| Pisum sativum | Fabaceae | Field Pea | PISSAT | non-native | 0 | 5 | forb | annual |
| Planera aquatica | Ulmaceae | Water Elm | PLAAQU | native | 8 | -5 | tree | perennial |
| Planodes virginica | Brassicaceae | Virginia Rock Cress | PLDVIR | native | 0 | 3 | forb | annual |
| Plantago aristata | Plantaginaceae | Bracted Plantain | PLAARI | native | 1 | 5 | forb | annual |
| Plantago cordata | Plantaginaceae | Heart-Leaved Plantain | PLACOR | native | 10 | -5 | forb | perennial |
| Plantago elongata | Plantaginaceae | Slender Plantain | PLAELO | native | 1 | 3 | forb | annual |
| Plantago heterophylla | Plantaginaceae | Small Plantain | PLAHET | native | 0 | -3 | forb | annual |
| Plantago indica | Plantaginaceae | Whorled Plantain | PLAIND | non-native | 0 | 3 | forb | annual |
| Plantago lanceolata | Plantaginaceae | English Plantain | PLALAN | non-native | 0 | 3 | forb | annual |
| Plantago major | Plantaginaceae | Common Plantain | PLAMAJ | non-native | 0 | 3 | forb | annual |
| Plantago patagonica | Plantaginaceae | Patagonia Plantain | PLAPAT | native | 0 | 5 | forb | annual |
| Plantago rhodosperma | Plantaginaceae | Red-Seeded Plantain | PLARHO | non-native | 0 | 5 | forb | annual |
| Plantago rugelii | Plantaginaceae | Red-Stalked Plantain | PLARUG | native | 0 | 0 | forb | annual |
| Plantago virginica | Plantaginaceae | Dwarf Plantain | PLAVIG | native | 1 | 5 | forb | annual |
| Plantago wrightiana | Plantaginaceae | Wrights Plantain | PLAWRI | non-native | 0 | 5 | forb | perennial |
| Platanthera ciliaris | Orchidaceae | Orange Fringed Orchid | PLACIL | native | 10 | -3 | forb | perennial |
| Platanthera clavellata | Orchidaceae | Small Green Fringed Orchid | PLACLA | native | 10 | -5 | forb | perennial |
| Platanthera flava var. flava | Orchidaceae | Pale Green Orchid | PLAFLF | native | 10 | -3 | forb | perennial |
| Platanthera flava var. herbiola | Orchidaceae | Tubercled Orchid | PLAFLH | native | 10 | -3 | forb | perennial |
| Platanthera lacera | Orchidaceae | Ragged Fringed Orchid | PLALAC | native | 6 | -3 | forb | perennial |
| Platanthera leucophaea | Orchidaceae | Eastern Prairie White Fringed Orchid | PLALEU | native | 10 | -3 | forb | perennial |
| Platanthera peramoena | Orchidaceae | Purple Fringless Orchid | PLAPER | native | 8 | -3 | forb | perennial |
| Platanthera praeclara | Orchidaceae | Western Prairie White Fringed Orchid | PLAPRA | native | 10 | 3 | forb | perennial |
| Platanthera psychodes | Orchidaceae | Purple Fringed Orchid | PLAPSY | native | 10 | -3 | forb | perennial |
| Platanus occidentalis | Platanaceae | Sycamore | PLAOCC | native | 3 | -3 | tree | perennial |
| Pluchea camphorata | Asteraceae | Camphor Weed | PLUCAM | native | 4 | -3 | forb | annual |
| Pluchea foetida | Asteraceae | Stinking Marsh Fleabane | PLUFOE | native | 10 | -5 | forb | perennial |
| Poa annua | Poaceae | Annual Blue Grass | POAANN | non-native | 0 | 3 | grass | annual |
| Poa bulbosa | Poaceae | Bulbous Blue Grass | POABUL | non-native | 0 | 3 | grass | perennial |
| Poa chapmaniana | Poaceae | Spear Grass | POACHA | native | 2 | 3 | grass | annual |
| Poa compressa | Poaceae | Canada Blue Grass | POACOM | non-native | 0 | 3 | grass | perennial |
| Poa interior | Poaceae | Inland Bluegrass | POAINT | native | 10 | 5 | grass | perennial |
| Poa palustris | Poaceae | Marsh Blue Grass | POAPAL | non-native | 0 | -3 | grass | perennial |
| Poa pratensis | Poaceae | Kentucky Blue Grass | POAPRA | non-native | 0 | 3 | grass | perennial |
| Poa sylvestris | Poaceae | Woodland Blue Grass | POASYL | native | 5 | 0 | grass | perennial |
| Poa trivialis | Poaceae | Rough Blue Grass | POATRI | non-native | 0 | -3 | grass | perennial |
| Poa wolfii | Poaceae | Wolfs Blue Grass | POAWOL | native | 8 | 5 | grass | perennial |
| Podophyllum peltatum | Berberidaceae | May Apple | PODPEL | native | 4 | 3 | forb | perennial |
| Pogonia ophioglossoides | Orchidaceae | Snakemouth Orchid | POGOPH | native | 10 | -5 | forb | perennial |
| Polanisia dodecandra subsp. dodecandra | Cleomaceae | Clammyweed | POLDOC | native | 1 | 5 | forb | annual |
| Polanisia dodecandra subsp. trachysperma | Cleomaceae | Rough-Seeded Clammy Weed | POLDOT | native | 4 | 5 | forb | annual |
| Polemonium reptans | Polemoniaceae | Jacobs Ladder | POLREP | native | 6 | 3 | forb | perennial |
| Polygala incarnata | Polygalaceae | Pink Milkwort | POLINC | native | 8 | 3 | forb | annual |
| Polygala sanguinea | Polygalaceae | Field Milkwort | POLSAN | native | 4 | 3 | forb | annual |
| Polygala senega | Polygalaceae | Seneca Snakeroot | POLSEN | native | 6 | 3 | forb | perennial |
| Polygala verticillata | Polygalaceae | Whorled Milkwort | POLVER | native | 4 | 5 | forb | annual |
| Polygonatum biflorum var. commutatum | Liliaceae | Smooth Solomons Seal | POLBIF | native | 4 | 3 | forb | perennial |
| Polygonum achoreum | Polygonaceae | Leathery Knotweed | POLACH | native | 0 | 3 | forb | annual |
| Polygonum americanum | Polygonaceae | Southern Jointweed | POLAME | native | 10 | 5 | forb | perennial |
| Polygonum aviculare subsp. aviculare | Polygonaceae | Common Knotweed | POLAVA | non-native | 0 | 3 | forb | annual |
| Polygonum aviculare subsp. buxiforme | Polygonaceae | Box Knotweed | POLAVB | native | 2 | 5 | forb | annual |
| Polygonum aviculare subsp. depressum | Polygonaceae | Oval-Leaf Knotweed | POLAVD | non-native | 0 | 3 | forb | annual |
| Polygonum aviculare subsp. neglectum | Polygonaceae | Narrowleaf Knotweed | POLAVN | non-native | 0 | 5 | forb | annual |
| Polygonum erectum | Polygonaceae | Erect Knotweed | POLERE | native | 1 | 3 | forb | annual |
| Polygonum ramosissimum var. prolificum | Polygonaceae | Bushy Knotweed | POLRAP | native | 5 | 3 | forb | annual |
| Polygonum ramosissimum var. ramosissimum | Polygonaceae | Bushy Knotweed | POLRAR | native | 5 | 3 | forb | annual |
| Polygonum tenue | Polygonaceae | Slender Knotweed | POLTEN | native | 6 | 5 | forb | annual |
| Polymnia canadensis | Asteraceae | Leafcup | POLCAN | native | 6 | 5 | forb | perennial |
| Polymnia laevigata | Asteraceae | Smooth Leaf Cup | POLLAE | native | 10 | 5 | forb | perennial |
| Polypodium polypodioides var. michauxianum | Polypodiaceae | Resurrection Fern | POLPOL | native | 8 | 0 | fern | perennial |
| Polypodium virginianum | Polypodiaceae | Common Polypody | POLPVI | native | 9 | 5 | fern | perennial |
| Polypremum procumbens | Tetrachondraceae | Polypremum | POLPRO | native | 4 | 5 | forb | perennial |
| Polystichum acrostichoides | Dryopteridaceae | Christmas Fern | POLACR | native | 5 | 3 | fern | perennial |
| Polytaenia nuttallii | Apiaceae | Prairie Parsley | POLNUT | native | 8 | 5 | forb | perennial |
| Pomaria jamesii | Fabaceae | Rush Pea | POMJAM | non-native | 0 | 5 | forb | perennial |
| Pontederia cordata | Pontederiaceae | Pickerel Weed | PONCOR | native | 7 | -5 | forb | perennial |
| Populus alba | Salicaceae | White Poplar | POPALB | non-native | 0 | 5 | tree | perennial |
| Populus deltoides | Salicaceae | Cottonwood | POPDEL | native | 2 | 0 | tree | perennial |
| Populus grandidentata | Salicaceae | Large-Toothed Aspen | POPGRA | native | 10 | 3 | tree | perennial |
| Populus heterophylla | Salicaceae | Swamp Cottonwood | POPHET | native | 9 | -5 | tree | perennial |
| Populus nigra var. italica | Salicaceae | Lombardy Poplar | POPNIG | non-native | 0 | 5 | tree | perennial |
| Populus tremuloides | Salicaceae | Quaking Aspen | POPTRE | native | 7 | 0 | tree | perennial |
| Populus x canadensis | Salicaceae | Eugene Poplar | POPCAD | non-native | 0 | 5 | tree | perennial |
| Populus x canescens | Salicaceae | European Hybrid Aspen | POPCAS | non-native | 0 | 5 | tree | perennial |
| Populus x jackii | Salicaceae | Balm-Of-Gilead | POPJAC | non-native | 0 | 5 | tree | perennial |
| Portulaca grandiflora | Portulacaceae | Portulaca | PORGRA | non-native | 0 | 5 | forb | annual |
| Portulaca pilosa | Portulacaceae | Shaggy Portulaca | PORPIL | native | 7 | 5 | forb | annual |
| Portulacca oleracea | Portulacaceae | Purslane | POROLE | native | 0 | 3 | forb | annual |
| Potamogeton amplifolius | Potamogetonaceae | Large-Leaved Pondweed | POTAMP | native | 10 | -5 | forb | perennial |
| Potamogeton crispus | Potamogetonaceae | Beginners Pondweed | POTCRI | non-native | 0 | -5 | forb | perennial |
| Potamogeton diversifolius | Potamogetonaceae | Waterthread Pondweed | POTDIV | native | 5 | -5 | forb | perennial |
| Potamogeton epihydrus | Potamogetonaceae | Ribbon-Leaved Pondweed | POTEPI | native | 10 | -5 | forb | perennial |
| Potamogeton foliosus | Potamogetonaceae | Leafy Pondweed | POTFOL | native | 6 | -5 | forb | perennial |
| Potamogeton illinoensis | Potamogetonaceae | Illinois Pondweed | POTILL | native | 8 | -5 | forb | perennial |
| Potamogeton nodosus | Potamogetonaceae | Long-Leaved Pondweed | POTNOD | native | 5 | -5 | forb | perennial |
| Potamogeton pectinatus | Potamogetonaceae | Comb Pondweed | POTPEC | native | 7 | -5 | forb | perennial |
| Potamogeton pulcher | Potamogetonaceae | Spotted Pondweed | POTPUL | native | 10 | -5 | forb | perennial |
| Potamogeton pusillus | Potamogetonaceae | Small Pondweed | POTPUS | native | 8 | -5 | forb | perennial |
| Potentilla argentea | Rosaceae | Silvery Cinquefoil | POTARG | non-native | 0 | 3 | forb | annual |
| Potentilla canadensis | Rosaceae | Five Fingers | POTCAN | native | 8 | 5 | forb | perennial |
| Potentilla norvegica | Rosaceae | Rough Cinquefoil | POTNOR | native | 0 | 3 | forb | annual |
| Potentilla recta | Rosaceae | Sulphur Cinquefoil | POTREC | non-native | 0 | 5 | forb | perennial |
| Potentilla rivalis | Rosaceae | Brook Cinquefoil | POTRIV | native | 4 | -3 | forb | annual |
| Potentilla simplex | Rosaceae | Common Cinquefoil | POTSIM | native | 3 | 3 | forb | perennial |
| Potentilla supina subsp. paradoxa | Rosaceae | River Cinquefoil | POTSUP | native | 8 | -3 | forb | annual |
| Prenanthes alba | Asteraceae | White Lettuce | PREALB | native | 9 | 3 | forb | perennial |
| Prenanthes altissima | Asteraceae | Tall White Lettuce | PREALT | native | 5 | 3 | forb | perennial |
| Prenanthes aspera | Asteraceae | Rough White Lettuce | PREASP | native | 7 | 5 | forb | perennial |
| Prenanthes crepidinea | Asteraceae | Great White Lettuce | PRECRE | native | 9 | 3 | forb | perennial |
| Prenanthes racemosa | Asteraceae | Glaucous White Lettuce | PRERAC | native | 10 | -3 | forb | perennial |
| Primula fassettii | Primulaceae | Amethyst Shooting Star | PRIFAS | native | 10 | 5 | forb | perennial |
| Primula frenchii | Primulaceae | Frenchs Shooting Star | PRIFRE | native | 10 | 5 | forb | perennial |
| Primula meadia | Primulaceae | Shooting Star | PRIMEA | native | 7 | 3 | forb | perennial |
| Primula veris | Primulaceae | Cowslip Primrose | PRIVER | non-native | 0 | 5 | forb | perennial |
| Proboscidea louisiana | Martyniaceae | Unicorn Plant | PROLOU | non-native | 0 | 3 | forb | annual |
| Proserpinaca palustris | Haloragaceae | Mermaid Weed | PROPAL | native | 8 | -5 | forb | perennial |
| Prosopis glandulosa | Fabaceae | Honey Mesquite | PROGLA | non-native | 0 | 5 | shrub | perennial |
| Prunella vulgaris var. lanceolata | Lamiaceae | Self-Heal | PRUVUA | native | 1 | 3 | forb | perennial |
| Prunella vulgaris var. vulgaris | Lamiaceae | Lawn Prunella | PRUVUV | non-native | 0 | 3 | forb | perennial |
| Prunus americana | Rosaceae | Wild Plum | PRUAME | native | 4 | 5 | tree | perennial |
| Prunus angustifolia | Rosaceae | Chickasaw Plum | PRUANG | native | 5 | 5 | shrub | perennial |
| Prunus armeniaca | Rosaceae | Apricot | PRUARM | non-native | 0 | 5 | tree | perennial |
| Prunus cerasus | Rosaceae | Sour Cherry | PRUCER | non-native | 0 | 5 | tree | perennial |
| Prunus hortulana | Rosaceae | Hortulan Plum | PRUHOR | native | 3 | 5 | tree | perennial |
| Prunus mahaleb | Rosaceae | Perfumed Cherry | PRUMAH | non-native | 0 | 5 | tree | perennial |
| Prunus mexicana | Rosaceae | Mexican Plum | PRUMEX | native | 3 | 5 | tree | perennial |
| Prunus munsoniana | Rosaceae | Wild Goose Plum | PRUMUN | native | 5 | 5 | tree | perennial |
| Prunus persica | Rosaceae | Peach | PRUPER | non-native | 0 | 5 | tree | perennial |
| Prunus serotina | Rosaceae | Wild Black Cherry | PRUSER | native | 2 | 3 | tree | perennial |
| Prunus spinosa | Rosaceae | Blackthorn | PRUSPI | non-native | 0 | 5 | shrub | perennial |
| Prunus virginiana | Rosaceae | Choke Cherry | PRUVIR | native | 4 | 3 | shrub | perennial |
| Pseudognaphalium helleri | Asteraceae | Rabbit Tobacco | PSEHEL | native | 4 | 5 | forb | annual |
| Pseudognaphalium micradenium | Asteraceae | Smooth Rabbit Tobacco | PSEMIC | native | 5 | 5 | forb | annual |
| Pseudognaphalium obtusifolium | Asteraceae | Old-Field Balsam | PSEOBT | native | 2 | 5 | forb | annual |
| Ptelea trifoliata | Rutaceae | Hop Tree | PTETRI | native | 5 | 3 | shrub | perennial |
| Pteridium aquilinum | Dennstaedtiaceae | Bracken Fern | PTEAQU | native | 4 | 3 | fern | perennial |
| Ptilimnium capillaceum | Apiaceae | Mock Bishops Weed | PTICAP | native | 10 | -5 | forb | annual |
| Ptilimnium costatum | Apiaceae | Ribbed Mock Bishops Weed | PTICOS | native | 7 | -5 | forb | annual |
| Ptilimnium nuttallii | Apiaceae | Nuttalls Mock Bishops Weed | PTINUT | native | 4 | -3 | forb | annual |
| Puccinellia distans | Poaceae | Alkali Grass | PUCDIS | non-native | 0 | 3 | grass | perennial |
| Pueraria montana var. lobata | Fabaceae | Kudzu Vine | PUEMON | non-native | 0 | 5 | vine | perennial |
| Pycnanthemum albescens | Lamiaceae | White Mountain Mint | PYCALB | native | 7 | 3 | forb | perennial |
| Pycnanthemum muticum | Lamiaceae | Short-Toothed Mountain Mint | PYCMUT | native | 10 | 0 | forb | perennial |
| Pycnanthemum pilosum | Lamiaceae | Hairy Mountain Mint | PYCPIL | native | 5 | 3 | forb | perennial |
| Pycnanthemum tenuifolium | Lamiaceae | Slender Mountain Mint | PYCTEN | native | 4 | 0 | forb | perennial |
| Pycnanthemum torrei | Lamiaceae | Torreys Mountain Mint | PYCTOR | native | 10 | 5 | forb | perennial |
| Pycnanthemum virginianum | Lamiaceae | Common Mountain Mint | PYCVIR | native | 6 | -3 | forb | perennial |
| Pyracantha coccinea | Rosaceae | Firethorn | PYRCOC | non-native | 0 | 5 | shrub | perennial |
| Pyrrhopappus carolinianus | Asteraceae | Yellow False Dandelion | PYRCAR | native | 0 | 5 | forb | annual |
| Pyrus calleryana | Rosaceae | Bradford Pear | PYRCAL | non-native | 0 | 5 | tree | perennial |
| Pyrus communis | Rosaceae | Pear | PYRCOM | non-native | 0 | 5 | tree | perennial |
| Quercus acutissima | Fagaceae | Sawtooth Oak | QUEACU | non-native | 0 | 5 | tree | perennial |
| Quercus alba | Fagaceae | White Oak | QUEALB | native | 4 | 3 | tree | perennial |
| Quercus bicolor | Fagaceae | Swamp White Oak | QUEBIC | native | 7 | -3 | tree | perennial |
| Quercus coccinea | Fagaceae | Scarlet Oak | QUECOC | native | 5 | 5 | tree | perennial |
| Quercus ellipsoidalis | Fagaceae | Hills Oak | QUEELL | native | 10 | 5 | tree | perennial |
| Quercus falcata | Fagaceae | Southern Red Oak | QUEFAL | native | 6 | 3 | tree | perennial |
| Quercus imbricaria | Fagaceae | Shingle Oak | QUEIMB | native | 3 | 3 | tree | perennial |
| Quercus lyrata | Fagaceae | Overcup Oak | QUELYR | native | 8 | -5 | tree | perennial |
| Quercus macrocarpa | Fagaceae | Bur Oak | QUEMAC | native | 4 | 3 | tree | perennial |
| Quercus marilandica | Fagaceae | Blackjack Oak | QUEMAR | native | 4 | 5 | tree | perennial |
| Quercus michauxii | Fagaceae | Basket Oak | QUEMIC | native | 9 | -3 | tree | perennial |
| Quercus muehlenbergii | Fagaceae | Chinquapin Oak | QUEMUE | native | 5 | 5 | tree | perennial |
| Quercus nigra | Fagaceae | Water Oak | QUENIG | native | 5 | 0 | tree | perennial |
| Quercus pagoda | Fagaceae | Cherrybark Oak | QUEPAG | native | 7 | -3 | tree | perennial |
| Quercus palustris | Fagaceae | Pin Oak | QUEPAL | native | 4 | -3 | tree | perennial |
| Quercus phellos | Fagaceae | Willow Oak | QUEPHE | native | 7 | -3 | tree | perennial |
| Quercus prinoides | Fagaceae | Dwarf Chestnut Oak | QUEPRI | native | 5 | 5 | tree | perennial |
| Quercus rubra | Fagaceae | Red Oak | QUERUB | native | 5 | 3 | tree | perennial |
| Quercus shumardii var. acerifolia | Fagaceae | Schneck Oak | QUESHA | native | 7 | 5 | tree | perennial |
| Quercus shumardii var. shumardii | Fagaceae | Shumard Oak | QUESHS | native | 5 | 0 | tree | perennial |
| Quercus similis | Fagaceae | Bottomland Post Oaki | QUESIM | native | 9 | -3 | tree | perennial |
| Quercus stellata | Fagaceae | Post Oak | QUESTE | native | 4 | 5 | tree | perennial |
| Quercus texana | Fagaceae | Nuttalls Oak | QUETEX | native | 10 | -5 | tree | perennial |
| Quercus velutina | Fagaceae | Black Oak | QUEVEL | native | 4 | 5 | tree | perennial |
| Ranunculus abortivus | Ranunculaceae | Small-Flowered Buttercup | RANABO | native | 1 | -3 | forb | perennial |
| Ranunculus acris | Ranunculaceae | Tall Buttercup | RANACR | non-native | 0 | 0 | forb | perennial |
| Ranunculus aquatilis var. diffusus | Ranunculaceae | White Crowfoot | RANAQU | native | 8 | -5 | forb | perennial |
| Ranunculus arvensis | Ranunculaceae | Spiny Buttercup | RANARV | non-native | 0 | 5 | forb | annual |
| Ranunculus bulbosus | Ranunculaceae | Bulbous Buttercup | RANBUL | non-native | 0 | 0 | forb | perennial |
| Ranunculus cymbalaria | Ranunculaceae | Seaside Crowfoot | RANCYM | native | 10 | -5 | forb | perennial |
| Ranunculus fascicularis | Ranunculaceae | Early Buttercup | RANFAS | native | 5 | 3 | forb | perennial |
| Ranunculus ficaria | Ranunculaceae | Lesser Celandine | RANFIC | non-native | 0 | 0 | forb | perennial |
| Ranunculus flabellaris | Ranunculaceae | Yellow Water Crowfoot | RANFLA | native | 8 | -5 | forb | perennial |
| Ranunculus harveyi | Ranunculaceae | Harveys Buttercup | RANHAR | native | 7 | 3 | forb | perennial |
| Ranunculus hispidus var. caricetorum | Ranunculaceae | Swamp Buttercup | RANHIC | native | 4 | 0 | forb | perennial |
| Ranunculus hispidus var. hispidus | Ranunculaceae | Hispid Buttercup | RANHIH | native | 6 | 3 | forb | perennial |
| Ranunculus hispidus var. nitidus | Ranunculaceae | Swamp Buttercup | RANHIN | native | 4 | 0 | forb | perennial |
| Ranunculus laxicaulis | Ranunculaceae | Water Plantain Spearwort | RANLAX | native | 7 | -5 | forb | annual |
| Ranunculus micranthus | Ranunculaceae | Rock Crowfoot | RANMIC | native | 3 | 3 | forb | perennial |
| Ranunculus parviflorus | Ranunculaceae | Small-Flowered Crowfoot | RANPAR | non-native | 0 | 0 | forb | annual |
| Ranunculus pusillus | Ranunculaceae | Low Spearwort | RANPUS | native | 6 | -5 | forb | annual |
| Ranunculus recurvatus | Ranunculaceae | Hooked Buttercup | RANREC | native | 5 | -3 | forb | perennial |
| Ranunculus repens | Ranunculaceae | Creeping Buttercup | RANREP | non-native | 0 | 0 | forb | perennial |
| Ranunculus sardous | Ranunculaceae | Hairy Buttercup | RANSAR | non-native | 0 | 3 | forb | annual |
| Ranunculus sceleratus | Ranunculaceae | Cursed Buttercup | RANSCE | native | 5 | -5 | forb | annual |
| Raphanus raphanistrum | Brassicaceae | Wild Radish | RAPRAP | non-native | 0 | 5 | forb | annual |
| Raphanus sativus | Brassicaceae | Radish | RAPSAT | non-native | 0 | 5 | forb | annual |
| Rapistrum rugosum | Brassicaceae | Turnipweed | RAPRUG | non-native | 0 | 5 | forb | annual |
| Ratibida columnifera | Asteraceae | Long-Headed Coneflower | RATCOL | non-native | 0 | 5 | forb | perennial |
| Ratibida pinnata | Asteraceae | Grey-Headed Coneflower | RATPIN | native | 4 | 5 | forb | perennial |
| Ratibida tagetes | Asteraceae | Shortray Prairie Coneflower | RATTAG | non-native | 0 | 5 | forb | perennial |
| Reseda lutea | Resedaceae | Wild Mignonette | RESLUA | non-native | 0 | 5 | forb | perennial |
| Reseda luteola | Resedaceae | Dyers Rocket | RESLUO | non-native | 0 | 5 | forb | biennial |
| Rhamnus caroliniana | Rhamnaceae | Carolina Buckthorn | RHACAR | native | 6 | 3 | shrub | perennial |
| Rhamnus cathartica | Rhamnaceae | Common Buckthorn | RHACAT | non-native | 0 | 0 | shrub | perennial |
| Rhamnus davurica | Rhamnaceae | Dahurian Buckthorn | RHADAV | non-native | 0 | 5 | shrub | perennial |
| Rhamnus japonica | Rhamnaceae | Japanese Buckthorn | RHAJAP | non-native | 0 | 5 | shrub | perennial |
| Rhamnus lanceolata | Rhamnaceae | Lance-Leaved Buckthorn | RHALAN | native | 5 | 0 | shrub | perennial |
| Rhexia mariana var. interior | Melastomaceae | Meadow Beauty | RHEMAI | native | 9 | -5 | forb | perennial |
| Rhexia mariana var. mariana | Melastomaceae | Maryland Meadow Beauty | RHEMAM | native | 8 | -5 | forb | perennial |
| Rhexia virginica | Melastomaceae | Virginia Meadow Beauty | RHEVIR | native | 6 | -5 | forb | perennial |
| Rhododendron prinophyllum | Ericaceae | Azalea | RHOPRI | native | 8 | 5 | shrub | perennial |
| Rhodotypos scandens | Rosaceae | Jetbead | RHOSCA | non-native | 0 | 5 | shrub | perennial |
| Rhus aromatica var. aromatica | Anacardiaceae | Common Fragrant Sumac | RHUARA | native | 4 | 5 | shrub | perennial |
| Rhus aromatica var. serotina | Anacardiaceae | Tall Frangrant Sumac | RHUARS | native | 6 | 5 | shrub | perennial |
| Rhus copallinum var. latifolia | Anacardiaceae | Shining Sumac | RHUCOP | native | 2 | 5 | shrub | perennial |
| Rhus glabra | Anacardiaceae | Smooth Sumac | RHUGLA | native | 1 | 5 | shrub | perennial |
| Rhus typhina | Anacardiaceae | Staghorn Sumac | RHUTYP | non-native | 0 | 5 | shrub | perennial |
| Rhynchosia difformis | Fabaceae | Double-Formed Snoutbean | RHYDIF | native | 10 | 5 | forb | perennial |
| Rhynchosia latifolia | Fabaceae | Prairie Snoutbean | RHYLAT | native | 9 | 5 | forb | perennial |
| Rhynchospora capillacea | Cyperaceae | Hair Beak Rush | RHYCAC | native | 10 | -5 | sedge | perennial |
| Rhynchospora capitellata | Cyperaceae | Clustered Beak Rush | RHYCAT | native | 8 | -5 | sedge | perennial |
| Rhynchospora corniculata | Cyperaceae | Shortbristle Horned Rush | RHYCOR | native | 7 | -5 | sedge | perennial |
| Rhynchospora globularis var. recognita | Cyperaceae | Grass Beak Rush | RHYGLO | native | 8 | -3 | sedge | perennial |
| Rhynchospora harveyi | Cyperaceae | Harveys Beak Rush | RHYHAR | native | 10 | 3 | sedge | perennial |
| Rhynchospora macrostachya | Cyperaceae | Tall Horned Rush | RHYMAC | native | 9 | -5 | sedge | perennial |
| Rhynchospora scirpoides | Cyperaceae | Long-Beaked Beak Rush | RHYSCI | native | 10 | -5 | sedge | annual |
| Ribes americanum | Grossulariaceae | Wild Black Current | RIBAME | native | 10 | -3 | shrub | perennial |
| Ribes cynosbati | Grossulariaceae | Prickly Wild Gooseberry | RIBCYN | native | 5 | 3 | shrub | perennial |
| Ribes missouriense | Grossulariaceae | Wild Gooseberry | RIBMIS | native | 3 | 5 | shrub | perennial |
| Ribes odoratum | Grossulariaceae | Clove Current | RIBODO | native | 10 | 5 | shrub | perennial |
| Ricinus communis | Euphorbiaceae | Castor-Oil Plant | RICCOM | non-native | 0 | 3 | forb | annual |
| Robinia hispida | Fabaceae | Bristly Locust | ROBHIS | non-native | 0 | 5 | shrub | perennial |
| Robinia pseudoacacia | Fabaceae | Black Locust (Native) | ROBPSN | native | 6 | 3 | tree | perennial |
| Rorippa aquatica | Brassicaceae | Lake Cress | RORAQU | native | 10 | -5 | forb | perennial |
| Rorippa curvipes | Brassicaceae | Blunt-Leaved Yellow Cress | RORCUR | native | 5 | -3 | forb | annual |
| Rorippa palustris var. fernaldiana | Brassicaceae | Marsh Yellow Cress | RORPAL | native | 2 | -5 | forb | annual |
| Rorippa sessiliflora | Brassicaceae | Sessile-Flowered Cress | RORSES | native | 3 | -5 | forb | annual |
| Rorippa sinuata | Brassicaceae | Spreading Yellow Cress | RORSIN | native | 3 | -3 | forb | perennial |
| Rorippa sylvestris | Brassicaceae | Creeping Yellow Cress | RORSYL | non-native | 0 | -3 | forb | perennial |
| Rorippa tenerrima | Brassicaceae | Modoc Yellow Cress | RORTEN | native | 5 | 0 | forb | annual |
| Rosa arkansana | Rosaceae | Sunshine Rose | ROSARK | native | 5 | 3 | shrub | perennial |
| Rosa blanda | Rosaceae | Early Wild Rose | ROSBLA | native | 6 | 3 | shrub | perennial |
| Rosa canina | Rosaceae | Dog Rose | ROSCAN | non-native | 0 | 5 | shrub | perennial |
| Rosa carolina subsp. carolina | Rosaceae | Pasture Rose | ROSCAC | native | 4 | 3 | shrub | perennial |
| Rosa carolina subsp. subserrulata | Rosaceae | Pasture Rose | ROSCAS | native | 4 | 3 | shrub | perennial |
| Rosa gallica | Rosaceae | French Rose | ROSGAL | non-native | 0 | 5 | shrub | perennial |
| Rosa lucieae | Rosaceae | Memorial Rose | ROSLUC | non-native | 0 | 5 | shrub | perennial |
| Rosa multiflora | Rosaceae | Multiflora Rose | ROSMUL | non-native | 0 | 3 | shrub | perennial |
| Rosa palustris | Rosaceae | Swamp Rose | ROSPAL | native | 7 | -5 | shrub | perennial |
| Rosa rubiginosa | Rosaceae | Sweetbriar | ROSRUB | non-native | 0 | 5 | shrub | perennial |
| Rosa rugosa | Rosaceae | Rugosa Rose | ROSRUG | non-native | 0 | 3 | shrub | perennial |
| Rosa setigera | Rosaceae | Prairie Rose | ROSSET | native | 4 | 3 | shrub | perennial |
| Rosa spinosissima | Rosaceae | Scotch Rose | ROSSPI | non-native | 0 | 5 | shrub | perennial |
| Rosa woodsii | Rosaceae | Woods Rose | ROSWOO | non-native | 0 | 3 | shrub | perennial |
| Rotala ramosior | Lythraceae | Toothcup | ROTRAM | native | 4 | -5 | forb | annual |
| Rubus ablatus | Rosaceae | Plains Blackberry | RUBABL | native | 2 | 3 | shrub | perennial |
| Rubus aboriginum | Rosaceae | Garden Dewberry | RUBABO | native | 4 | 5 | shrub | perennial |
| Rubus allegheniensis | Rosaceae | Common Blackberry | RUBALL | native | 4 | 3 | shrub | perennial |
| Rubus alumnus | Rosaceae | Old Field Blackberry | RUBALU | native | 4 | 3 | shrub | perennial |
| Rubus argutus | Rosaceae | Sawtooth Blackberry | RUBARG | native | 1 | 0 | shrub | perennial |
| Rubus armeniacus | Rosaceae | Himalayan Blackberry | RUBARM | non-native | 0 | 5 | shrub | perennial |
| Rubus celer | Rosaceae | Bountiful Dewberry | RUBCEL | native | 4 | 5 | shrub | perennial |
| Rubus curtipes | Rosaceae | Short-Stalked Dewberry | RUBCUR | native | 3 | 5 | shrub | perennial |
| Rubus deamii | Rosaceae | Deams Dewberry | RUBDEA | native | 4 | 5 | shrub | perennial |
| Rubus enslenii | Rosaceae | One-Flowered Dewberry | RUBENS | native | 5 | 3 | shrub | perennial |
| Rubus flagellaris | Rosaceae | Common Dewberry | RUBFLA | native | 3 | 3 | shrub | perennial |
| Rubus frondosus | Rosaceae | Yankee Blackberry | RUBFRO | native | 2 | 5 | shrub | perennial |
| Rubus idaeus var. strigosus | Rosaceae | Red Raspberry | RUBIDA | non-native | 0 | 3 | shrub | perennial |
| Rubus laciniatus | Rosaceae | Cutleaf Blackberry | RUBLAC | non-native | 0 | 5 | shrub | perennial |
| Rubus laudatus | Rosaceae | Paririe Blackberry | RUBLAU | native | 4 | 3 | shrub | perennial |
| Rubus leviculus | Rosaceae | Bottomland Dewberry | RUBLEV | native | 4 | 5 | shrub | perennial |
| Rubus meracus | Rosaceae | Dryslope Dewberry | RUBMER | native | 6 | 5 | shrub | perennial |
| Rubus missouricus | Rosaceae | Missouri Dewberry | RUBMIS | native | 7 | 3 | shrub | perennial |
| Rubus mollior | Rosaceae | Softleaf Blackberry | RUBMOL | native | 5 | 5 | shrub | perennial |
| Rubus occidentalis | Rosaceae | Black Raspberry | RUBOCC | native | 3 | 5 | shrub | perennial |
| Rubus parvifolius | Rosaceae | Small-Leaved Raspberry | RUBPAR | non-native | 0 | 3 | shrub | perennial |
| Rubus phoenicolasius | Rosaceae | Wineberry | RUBPHO | non-native | 0 | 3 | shrub | perennial |
| Rubus plicatifolius | Rosaceae | Pleat-Leaved Dewberry | RUBPLI | native | 6 | 5 | shrub | perennial |
| Rubus roribaccus | Rosaceae | Lucretia Dewberry | RUBROR | native | 6 | 5 | shrub | perennial |
| Rubus rosa | Rosaceae | Rose Blackberry | RUBROS | native | 3 | 5 | shrub | perennial |
| Rubus satis | Rosaceae | New York Dewberry | RUBSAT | native | 4 | 5 | shrub | perennial |
| Rubus serissimus | Rosaceae | Chesapeake Blackberry | RUBSER | non-native | 0 | 5 | shrub | perennial |
| Rubus steelei | Rosaceae | Steeles Dewberry | RUBSTE | native | 3 | 5 | shrub | perennial |
| Rubus trivialis | Rosaceae | Southern Dewberry | RUBTRI | native | 4 | 3 | shrub | perennial |
| Rudbeckia amplexicaulis | Asteraceae | Coneflower | RUDAMP | native | 3 | 3 | forb | annual |
| Rudbeckia bicolor | Asteraceae | Pine Woods Coneflower | RUDBIC | native | 2 | 5 | forb | annual |
| Rudbeckia fulgida var. sullivantii | Asteraceae | Orange Coneflower | RUDFUS | native | 7 | -3 | forb | perennial |
| Rudbeckia fulgida var. umbrosa | Asteraceae | Orange Coneflower | RUDFUU | native | 7 | -5 | forb | perennial |
| Rudbeckia grandiflora | Asteraceae | Large Black-Eyed Susan | RUDGRA | non-native | 0 | 5 | forb | perennial |
| Rudbeckia hirta | Asteraceae | Black-Eyed Susan | RUDHIR | native | 1 | 3 | forb | perennial |
| Rudbeckia laciniata | Asteraceae | Wild Golden Glow | RUDLAC | native | 4 | -3 | forb | perennial |
| Rudbeckia maxima | Asteraceae | Great Coneflower | RUDMAX | non-native | 0 | 0 | forb | perennial |
| Rudbeckia missouriensis | Asteraceae | Missouri Black-Eyed Susan | RUDMIS | native | 6 | 3 | forb | perennial |
| Rudbeckia subtomentosa | Asteraceae | Sweet Black-Eyed Susan | RUDSUB | native | 5 | 3 | forb | perennial |
| Rudbeckia triloba | Asteraceae | Brown-Eyed Susan | RUDTRI | native | 3 | 3 | forb | biennial |
| Ruellia humilis | Acanthaceae | Hairy Ruellia | RUEHUM | native | 3 | 3 | forb | perennial |
| Ruellia pedunculata | Acanthaceae | Wild Petunia | RUEPED | native | 5 | 5 | forb | perennial |
| Ruellia strepens | Acanthaceae | Smooth Ruellia | RUESTR | native | 3 | 0 | forb | perennial |
| Rumex acetosella | Polygonaceae | Field Sorrel | RUMACE | non-native | 0 | 3 | forb | perennial |
| Rumex altissimus | Polygonaceae | Pale Dock | RUMALT | native | 2 | -3 | forb | perennial |
| Rumex conglomeratus | Polygonaceae | Clustered Dock | RUMCON | non-native | 0 | -3 | forb | perennial |
| Rumex crispus | Polygonaceae | Curly Dock | RUMCRP | non-native | 0 | 0 | forb | perennial |
| Rumex cristatus | Polygonaceae | Greek Dock | RUMCRT | non-native | 0 | 5 | forb | perennial |
| Rumex dentatus | Polygonaceae | Asian Dock | RUMDEN | non-native | 0 | 3 | forb | perennial |
| Rumex fueginus | Polygonaceae | Golden Dock | RUMFUE | native | 5 | -5 | forb | annual |
| Rumex hastatulus | Polygonaceae | Wild Sorrel | RUMHAS | native | 3 | 3 | forb | perennial |
| Rumex obtusifolius | Polygonaceae | Bitter Dock | RUMOBT | non-native | 0 | -3 | forb | perennial |
| Rumex patientia | Polygonaceae | Patience Dock | RUMPAT | non-native | 0 | 5 | forb | perennial |
| Rumex pulcher | Polygonaceae | Fiddle Dock | RUMPUL | non-native | 0 | 3 | forb | perennial |
| Rumex stenophyllus | Polygonaceae | Eurasian Dock | RUMSTE | non-native | 0 | -3 | forb | perennial |
| Rumex triangulivalvis | Polygonaceae | Mexican Dock | RUMTRI | native | 3 | -3 | forb | perennial |
| Rumex verticillatus | Polygonaceae | Swamp Dock | RUMVER | native | 7 | -5 | forb | perennial |
| Ruppia maritima | Ruppiaceae | Ditch Grass | RUPMAR | native | 10 | -5 | forb | perennial |
| Ruta graveolens | Rutaceae | Common Rue | RUTGRA | non-native | 0 | 5 | shrub | perennial |
| Sabatia angularis | Gentianaceae | Rose Gentian | SABANG | native | 4 | 0 | forb | biennial |
| Sabatia brachiata | Gentianaceae | Narrow-Leaved Marsh Pink | SABBRA | native | 10 | 3 | forb | biennial |
| Sabatia campestris | Gentianaceae | Prairie Rose Gentian | SABCAM | native | 4 | 3 | forb | biennial |
| Sacciolepis striata | Poaceae | Cupscale | SACSTR | native | 9 | -5 | grass | perennial |
| Sagina decumbens | Caryophyllaceae | Trailing Pearlwort | SAGDEC | native | 2 | 0 | forb | annual |
| Sagina procumbens | Caryophyllaceae | Birdeye Pearlwort | SAGPRO | non-native | 0 | -3 | forb | perennial |
| Sagittaria ambigua | Alismataceae | Kansas Arrowhead | SAGAMB | native | 10 | -5 | forb | perennial |
| Sagittaria brevirostra | Alismataceae | Engelmanns Arrowhead | SAGBRE | native | 5 | -5 | forb | perennial |
| Sagittaria calycina | Alismataceae | Long-Lobed Arrowhead | SAGCAL | native | 4 | -5 | forb | annual |
| Sagittaria graminea | Alismataceae | Grass-Leaved Arrowhead | SAGGRA | native | 6 | -5 | forb | perennial |
| Sagittaria latifolia | Alismataceae | Common Arrowhead | SAGLAT | native | 4 | -5 | forb | perennial |
| Sagittaria platyphylla | Alismataceae | Delta Arrowhead | SAGPLA | native | 7 | -5 | forb | perennial |
| Sagittaria rigida | Alismataceae | Stiff Arrowhead | SAGRIG | native | 6 | -5 | forb | perennial |
| Salicornia europaea | Chenopodiaceae | Glasswort | SALEUR | non-native | 0 | -5 | forb | annual |
| Salix alba | Salicaceae | White Willow | SALALB | non-native | 0 | -3 | tree | perennial |
| Salix amygdaloides | Salicaceae | Peach-Leaved Willow | SALAMY | native | 5 | -3 | tree | perennial |
| Salix caroliniana | Salicaceae | Wards Willow | SALCAR | native | 4 | -5 | tree | perennial |
| Salix discolor | Salicaceae | Pussy Willow | SALDIS | native | 10 | -3 | shrub | perennial |
| Salix eriocephala | Salicaceae | Diamond Willow | SALERI | native | 5 | -3 | tree | perennial |
| Salix famelica | Salicaceae | Yellow Willow | SALFAM | native | 8 | -3 | shrub | perennial |
| Salix humilis | Salicaceae | Prairie Willow | SALHUM | native | 7 | 3 | shrub | perennial |
| Salix interior | Salicaceae | Sandbar Willow | SALINT | native | 3 | -3 | shrub | perennial |
| Salix nigra | Salicaceae | Black Willow | SALNIG | native | 2 | -5 | tree | perennial |
| Salix petiolaris | Salicaceae | Petioled Willow | SALPET | native | 9 | -3 | shrub | perennial |
| Salix purpurea | Salicaceae | Purple Willow | SALPUR | non-native | 0 | -3 | shrub | perennial |
| Salix sericea | Salicaceae | Autumn Willow | SALSER | native | 9 | -5 | shrub | perennial |
| Salix x fragilis | Salicaceae | Crack Willow | SALFRA | non-native | 0 | 0 | tree | perennial |
| Salix x sepulcralis | Salicaceae | Weeping Willow | SALSEP | non-native | 0 | -3 | tree | perennial |
| Salsola collina | Chenopodiaceae | Slender Russian Thistle | SALCOL | non-native | 0 | 5 | forb | annual |
| Salsola tragus | Chenopodiaceae | Russian Thistle | SALTRA | non-native | 0 | 3 | forb | annual |
| Salvia azurea var. grandiflora | Lamiaceae | Blue Sage | SALAZU | native | 4 | 5 | forb | perennial |
| Salvia coccinea | Lamiaceae | Scarlet Sage | SALCOC | non-native | 0 | 5 | forb | annual |
| Salvia lyrata | Lamiaceae | Lyre-Leaved Sage | SALLYR | native | 3 | 3 | forb | perennial |
| Salvia reflexa | Lamiaceae | Rocky Mountain Sage | SALREF | native | 3 | 5 | forb | annual |
| Sambucus canadensis | Caprifoliaceae | Elderberry | SAMCAN | native | 2 | 0 | shrub | perennial |
| Sambucus pubens | Caprifoliaceae | Red-Berried Elder | SAMPUB | native | 10 | 3 | shrub | perennial |
| Samolus parviflorus | Primulaceae | Water Pimpernel | SAMPAR | native | 5 | -5 | forb | perennial |
| Sanguinaria canadensis | Papaveraceae | Bloodroot | SANGCA | native | 5 | 5 | forb | perennial |
| Sanicula canadensis | Apiaceae | Canadian Black Snakeroot | SANICA | native | 3 | 3 | forb | biennial |
| Sanicula odorata | Apiaceae | Clustered Black Snakeroot | SANODO | native | 2 | 3 | forb | perennial |
| Sanicula smallii | Apiaceae | Smalls Black Snakeroot | SANSMA | native | 10 | 5 | forb | perennial |
| Sapindus saponaria var. drummondii | Sapindaceae | Soapberry | SAPSAP | native | 10 | 5 | tree | perennial |
| Saponaria officinalis | Caryophyllaceae | Bouncing Bet | SAPOFF | non-native | 0 | 3 | forb | perennial |
| Sassafras albidum | Lauraceae | Sassafras | SASALB | native | 2 | 3 | tree | perennial |
| Saururus cernuus | Saururaceae | Lizards Tail | SAUCER | native | 6 | -5 | forb | perennial |
| Scabiosa atropurpurea | Dipsacaceae | Pincushions | SCAATR | non-native | 0 | 5 | forb | perennial |
| Schedonnardus paniculatus | Poaceae | Tumble Grass | SCHPAN | native | 3 | 5 | grass | perennial |
| Schizachyrium scoparium | Poaceae | Little Bluestem | SCHSCO | native | 5 | 3 | grass | perennial |
| Schoenoplectus acutus | Cyperaceae | Hard-Stemmed Bulrush | SCHACU | native | 7 | -5 | sedge | perennial |
| Schoenoplectus americanus | Cyperaceae | Saltmarsh Bulrush | SCHAME | native | 10 | -5 | sedge | perennial |
| Schoenoplectus californicus | Cyperaceae | California Bulrush | SCHCAL | non-native | 0 | -5 | sedge | perennial |
| Schoenoplectus deltarum | Cyperaceae | Delta Bulrush | SCHDEL | native | 10 | -5 | sedge | perennial |
| Schoenoplectus etuberculatus | Cyperaceae | Canbys Bulrush | SCHETU | native | 10 | -5 | sedge | perennial |
| Schoenoplectus hallii | Cyperaceae | Halls Bulrush | SCHHAL | native | 10 | -5 | sedge | annual |
| Schoenoplectus heterochaetus | Cyperaceae | Slender Bulrush | SCHHET | native | 7 | -5 | sedge | perennial |
| Schoenoplectus mucronatus | Cyperaceae | Bog Bulrush | SCHMUC | non-native | 0 | -5 | sedge | annual |
| Schoenoplectus pungens | Cyperaceae | Chairmakers Rush | SCHPUN | native | 6 | -5 | sedge | perennial |
| Schoenoplectus purshianus | Cyperaceae | Weak-Stalked Bulrush | SCHPUR | non-native | 0 | -5 | sedge | annual |
| Schoenoplectus saximontanus | Cyperaceae | Rocky Mountain Bulrush | SCHSAX | native | 9 | -5 | sedge | annual |
| Schoenoplectus subterminalis | Cyperaceae | Swaying Bulrush | SCHSUB | native | 10 | -5 | sedge | perennial |
| Schoenoplectus tabernaemontani | Cyperaceae | Great Bulrush | SCHTAB | native | 5 | -5 | sedge | perennial |
| Schoenoplectus torreyi | Cyperaceae | Torreys Bulrush | SCHTOR | native | 10 | -5 | sedge | perennial |
| Scilla siberica | Liliaceae | Siberian Squill | SCISIB | non-native | 0 | 5 | forb | perennial |
| Scirpus atrovirens | Cyperaceae | Dark Green Rush | SCIATR | native | 3 | -5 | sedge | perennial |
| Scirpus cyperinus | Cyperaceae | Wool Grass | SCICYP | native | 5 | -5 | sedge | perennial |
| Scirpus divaricatus | Cyperaceae | Spreading Bulrush | SCIDIV | native | 8 | -5 | sedge | perennial |
| Scirpus georgianus | Cyperaceae | Georgia Bulrush | SCIGEO | native | 3 | -5 | sedge | perennial |
| Scirpus pallidus | Cyperaceae | Cloaked Bulrush | SCIPAL | native | 10 | -5 | sedge | perennial |
| Scirpus pedicellatus | Cyperaceae | Stalked Bulrush | SCIPED | native | 10 | -5 | sedge | perennial |
| Scirpus pendulus | Cyperaceae | Red Bulrush | SCIPEN | native | 5 | -5 | sedge | perennial |
| Scirpus polyphyllus | Cyperaceae | Leafy Bulrush | SCIPOL | native | 10 | -5 | sedge | perennial |
| Scirpus rubricosus | Cyperaceae | Long-Stalked Wool Grass | SCIRUB | native | 5 | -5 | sedge | perennial |
| Scleranthus annuus | Caryophyllaceae | Knawel | SCLANN | non-native | 0 | 3 | forb | annual |
| Scleria ciliata | Cyperaceae | Hairy Nut-Rush | SCLCIL | native | 8 | 0 | sedge | perennial |
| Scleria oligantha | Cyperaceae | Few-Flowered Nut-Rush | SCLOLI | native | 8 | 3 | sedge | perennial |
| Scleria pauciflora | Cyperaceae | Papillose Nut Rush | SCLPAU | native | 6 | 3 | sedge | perennial |
| Scleria reticularis var. pubescens | Cyperaceae | Muhlenbergs Nut-Rush | SCLRET | native | 10 | -3 | sedge | annual |
| Scleria triglomerata | Cyperaceae | Tall Nut Rush | SCLTRI | native | 6 | 0 | sedge | perennial |
| Scleria verticillata | Cyperaceae | Low Nut Rush | SCLVER | native | 10 | -5 | sedge | annual |
| Sclerochloa dura | Poaceae | Hard Grass | SCLDUR | non-native | 0 | 5 | grass | perennial |
| Scrophularia lanceolata | Scrophulariaceae | Early Figowrt | SCRLAN | native | 10 | 3 | forb | perennial |
| Scrophularia marilandica | Scrophulariaceae | Late Figwort | SCRMAR | native | 3 | 3 | forb | perennial |
| Scutellaria bushii | Lamiaceae | Bushs Skullcap | SCUBUS | native | 10 | 5 | forb | perennial |
| Scutellaria elliptica | Lamiaceae | Hairy Skullcap | SCUELL | native | 7 | 5 | forb | perennial |
| Scutellaria galericulata | Lamiaceae | Marsh Skullcap | SCUGAL | native | 10 | -5 | forb | perennial |
| Scutellaria incana | Lamiaceae | Downy Skullcap | SCUINC | native | 5 | 5 | forb | perennial |
| Scutellaria lateriflora | Lamiaceae | Mad-Dog Skullcap | SCULAT | native | 5 | -5 | forb | perennial |
| Scutellaria nervosa | Lamiaceae | Veiny Skullcap | SCUNER | native | 8 | 0 | forb | perennial |
| Scutellaria ovata | Lamiaceae | Heart-Leaved Skullcap | SCUOVA | native | 5 | 3 | forb | perennial |
| Scutellaria parvula var. australis | Lamiaceae | Southern Small Skullcap | SCUPAA | native | 5 | 3 | forb | perennial |
| Scutellaria parvula var. missouriensis | Lamiaceae | Leonards Skullcap | SCUPAM | native | 4 | 3 | forb | perennial |
| Scutellaria parvula var. parvula | Lamiaceae | Small Skullcap | SCUPAP | native | 4 | 3 | forb | perennial |
| Secale cereale | Poaceae | Rye | SECCER | non-native | 0 | 5 | grass | annual |
| Securigera varia | Fabaceae | Crown Vetch | SECVAR | non-native | 0 | 5 | forb | perennial |
| Sedum acre | Crassulaceae | Mossy Stonecrop | SEDACR | non-native | 0 | 5 | forb | perennial |
| Sedum erythrostictum | Crassulaceae | Pale-Flowered Stonecrop | SEDERY | non-native | 0 | 5 | forb | perennial |
| Sedum nuttallianum | Crassulaceae | Yellow Stonecrop | SEDNUT | native | 10 | 5 | forb | perennial |
| Sedum pulchellum | Crassulaceae | Widows Cross | SEDPUL | native | 7 | 3 | forb | annual |
| Sedum purpureum | Crassulaceae | Live-Forever | SEDPUR | non-native | 0 | 5 | forb | perennial |
| Sedum reflexum | Crassulaceae | Jennys Stonecrop | SEDREF | non-native | 0 | 5 | forb | perennial |
| Sedum sarmentosum | Crassulaceae | Stringy Stonecrop | SEDSAR | non-native | 0 | 5 | forb | perennial |
| Sedum ternatum | Crassulaceae | Wild Stonecrop | SEDTER | native | 6 | 5 | forb | perennial |
| Selaginella apoda | Selaginellaceae | Marsh Spikemoss | SELAPO | native | 8 | -3 | fern | perennial |
| Selaginella eclipes | Selaginellaceae | Hidden Spikemoss | SELECL | native | 8 | -3 | fern | perennial |
| Selaginella rupestris | Selaginellaceae | Sand Spikemoss | SELRUP | native | 8 | 5 | fern | perennial |
| Selenia aurea | Brassicaceae | Golden Selenia | SELAUR | native | 6 | 5 | forb | annual |
| Senecio ampullaceus | Asteraceae | Texas Ragwort | SENAMP | non-native | 0 | 5 | forb | annual |
| Senecio vulgaris | Asteraceae | Common Groundsel | SENVUL | non-native | 0 | 5 | forb | annual |
| Senna marilandica | Fabaceae | Maryland Senna | SENMAR | native | 4 | 0 | forb | perennial |
| Senna obtusifolia | Fabaceae | Sickle Senna | SENOBT | native | 3 | 3 | forb | annual |
| Senna occidentalis | Fabaceae | Coffee Senna | SENOCC | non-native | 0 | 3 | forb | annual |
| Sesamum indicum | Pedaliaceae | Sesame | SESIND | non-native | 0 | 5 | forb | annual |
| Sesbania herbacea | Fabaceae | Sesbania | SESHER | native | 3 | -3 | forb | annual |
| Sesbania vesicaria | Fabaceae | Bagpod | SESVES | non-native | 0 | -3 | forb | annual |
| Setaria faberi | Poaceae | Giant Foxtail | SETFAB | non-native | 0 | 3 | grass | annual |
| Setaria glauca | Poaceae | Yellow Foxtail | SETGLA | non-native | 0 | 0 | grass | annual |
| Setaria italica | Poaceae | Foxtail Millet | SETITA | non-native | 0 | 3 | grass | annual |
| Setaria parviflora | Poaceae | Perennial Foxtail | SETPAR | native | 4 | 3 | grass | perennial |
| Setaria verticillata | Poaceae | Bristly Foxtail | SETVER | non-native | 0 | 0 | grass | annual |
| Setaria viridis var. major | Poaceae | Giant Green Foxtail | SETVIM | non-native | 0 | 5 | grass | annual |
| Setaria viridis var. viridis | Poaceae | Green Foxtail | SETVIV | non-native | 0 | 5 | grass | annual |
| Sherardia arvensis | Rubiaceae | Field Madder | SHEARV | non-native | 0 | 5 | forb | annual |
| Sicyos angulatus | Cucurbitaceae | Bur Cucumber | SICANG | native | 4 | 0 | forb | annual |
| Sida elliottii | Malvaceae | Elliotts Sida | SIDELL | native | 10 | 5 | forb | perennial |
| Sida spinosa | Malvaceae | Prickly Sida | SIDSPI | non-native | 0 | 3 | forb | annual |
| Sideroxylon lanuginosum subsp. oblongifolium | Sapotaceae | Gum Bumelia | SIDLAN | native | 5 | 3 | tree | perennial |
| Sideroxylon lycioides | Sapotaceae | Southern Buckthorn | SIDLYC | native | 10 | -3 | shrub | perennial |
| Silene antirrhina | Caryophyllaceae | Sleepy Catchfly | SILANT | native | 2 | 5 | forb | annual |
| Silene caroliniana var. wherryi | Caryophyllaceae | Wild Pink | SILCAR | native | 9 | 5 | forb | perennial |
| Silene conoidea | Caryophyllaceae | Mediterranean Catchfly | SILCON | non-native | 0 | 5 | forb | annual |
| Silene csereii | Caryophyllaceae | Glaucous Campion | SILCSE | non-native | 0 | 5 | forb | biennial |
| Silene dichotoma | Caryophyllaceae | Forked Catchfly | SILDIC | non-native | 0 | 5 | forb | annual |
| Silene dioica | Caryophyllaceae | Red Campion | SILDIO | non-native | 0 | 5 | forb | biennial |
| Silene gallica | Caryophyllaceae | French Silene | SILGAL | non-native | 0 | 5 | forb | annual |
| Silene latifolia | Caryophyllaceae | White Campion | SILLAT | non-native | 0 | 5 | forb | biennial |
| Silene nivea | Caryophyllaceae | Snowy Campion | SILNIV | native | 8 | 0 | forb | perennial |
| Silene noctiflora | Caryophyllaceae | Night-Flowering Catchfly | SILNOC | non-native | 0 | 5 | forb | annual |
| Silene regia | Caryophyllaceae | Royal Catchfly | SILREG | native | 9 | 5 | forb | perennial |
| Silene stellata | Caryophyllaceae | Starry Campion | SILSTE | native | 5 | 5 | forb | perennial |
| Silene virginica | Caryophyllaceae | Fire Pink | SILVIR | native | 7 | 5 | forb | perennial |
| Silene vulgaris | Caryophyllaceae | Bladder Campion | SILVUL | non-native | 0 | 5 | forb | perennial |
| Silphium asteriscus | Asteraceae | Starry Rosinweed | SILAST | native | 7 | 5 | forb | perennial |
| Silphium integrifolium var. integrifolium | Asteraceae | Rosinweed | SILINI | native | 4 | 5 | forb | perennial |
| Silphium integrifolium var. laeve | Asteraceae | Blue Rosinweed | SILINL | native | 4 | 5 | forb | perennial |
| Silphium laciniatum | Asteraceae | Compass Plant | SILLAC | native | 6 | 5 | forb | perennial |
| Silphium perfoliatum | Asteraceae | Cup Plant | SILPER | native | 3 | -3 | forb | perennial |
| Silphium radula | Asteraceae | Rough-Leaved Rosinweed | SILRAD | non-native | 0 | 5 | forb | perennial |
| Silphium terebinthinaceum | Asteraceae | Prairie Dock | SILTER | native | 5 | 0 | forb | perennial |
| Silybum marianum | Asteraceae | Milk Thistle | SILMAR | non-native | 0 | 5 | forb | annual |
| Sinapis alba | Brassicaceae | White Mustard | SINALB | non-native | 0 | 5 | forb | annual |
| Sinapis arvensis | Brassicaceae | Charlock | SINARV | non-native | 0 | 5 | forb | annual |
| Sisymbrium altissimum | Brassicaceae | Tumble Mustard | SISALT | non-native | 0 | 3 | forb | annual |
| Sisymbrium loeselii | Brassicaceae | Tall Hedge Mustard | SISLOE | non-native | 0 | 5 | forb | annual |
| Sisymbrium officinale | Brassicaceae | Hedge Mustard | SISOFF | non-native | 0 | 5 | forb | annual |
| Sisyrinchium albidum | Iridaceae | Common Blue-Eyed Grass | SISALB | native | 7 | 3 | forb | perennial |
| Sisyrinchium angustifolium | Iridaceae | Pointed Blue-Eyed Grass | SISANG | native | 5 | 0 | forb | perennial |
| Sisyrinchium atlanticum | Iridaceae | Eastern Blue-Eyed Grass | SISATL | native | 9 | -3 | forb | perennial |
| Sisyrinchium campestre | Iridaceae | Prairie Blue-Eyed Grass | SISCAM | native | 5 | 5 | forb | perennial |
| Sium suave | Apiaceae | Water Parsnip | SIUSUA | native | 6 | -5 | forb | perennial |
| Smallanthus uvedalius | Asteraceae | Yellow-Flower Leafcup | SMAUVE | native | 8 | 5 | forb | perennial |
| Smilax bona-nox | Smilacaceae | Saw Greenbriar | SMIBON | native | 3 | 3 | vine | perennial |
| Smilax ecirrhata | Smilacaceae | Upright Carrrion Flower | SMIECI | native | 5 | 5 | forb | perennial |
| Smilax glauca | Smilacaceae | Cat Greenbriar | SMIGLA | native | 4 | 3 | vine | perennial |
| Smilax hispida | Smilacaceae | Bristly Greenbriar | SMIHIS | native | 3 | 0 | vine | perennial |
| Smilax illinoensis | Smilacaceae | Illinois Carrion Flower | SMIILL | native | 9 | 5 | forb | perennial |
| Smilax lasioneuron | Smilacaceae | Carrion Flower | SMILAS | native | 5 | 5 | forb | perennial |
| Smilax pulverulenta | Smilacaceae | Powdery Carrion Flower | SMIPUL | native | 6 | 3 | forb | perennial |
| Smilax rotundifolia | Smilacaceae | Horsebriar | SMIROT | native | 6 | 0 | vine | perennial |
| Solanum americanum | Solanaceae | American Black Nightshade | SOLAME | native | 1 | 3 | forb | annual |
| Solanum carolinense | Solanaceae | Horse Nettle | SOLCAR | native | 0 | 3 | forb | perennial |
| Solanum dimidiatum | Solanaceae | Western Horse Nettle | SOLDIM | non-native | 0 | 5 | forb | perennial |
| Solanum dulcamara | Solanaceae | Bittersweet Nightshade | SOLDUL | non-native | 0 | 0 | vine | perennial |
| Solanum elaeagnifolium | Solanaceae | White Horse Nettle | SOLELA | native | 1 | 5 | forb | perennial |
| Solanum lycopersicum | Solanaceae | Tomato | SOLLYC | non-native | 0 | 5 | forb | annual |
| Solanum nigrum | Solanaceae | Black Nightshade | SOLNIG | non-native | 0 | 3 | forb | annual |
| Solanum pseudocapsicum | Solanaceae | Jerusalem Cherry | SOLPSE | non-native | 0 | 5 | shrub | perennial |
| Solanum ptycanthum | Solanaceae | West Indian Nightshade | SOLPTY | native | 1 | 3 | forb | annual |
| Solanum rostratum | Solanaceae | Buffalo Bur | SOLROS | non-native | 0 | 5 | forb | annual |
| Solanum sarachoides | Solanaceae | Viscid Nightshade | SOLSAR | non-native | 0 | 5 | forb | perennial |
| Solanum triflorum | Solanaceae | Cutleaf Nightshade | SOLTRI | non-native | 0 | 5 | forb | annual |
| Solanum tuberosum | Solanaceae | Potato | SOLTUB | non-native | 0 | 5 | forb | perennial |
| Solidago altissima var. altissima | Asteraceae | Tall Goldenrod | SOLALA | native | 1 | 3 | forb | perennial |
| Solidago altissima var. gilvicanescens | Asteraceae | Tall Goldenrod | SOLALG | native | 3 | 3 | forb | perennial |
| Solidago arguta | Asteraceae | Sharp-Leaved Goldenrod | SOLARG | native | 7 | 5 | forb | perennial |
| Solidago buckleyi | Asteraceae | Buckleys Goldenrod | SOLBUC | native | 8 | 5 | forb | perennial |
| Solidago caesia | Asteraceae | Blue-Stemmed Goldenrod | SOLCAE | native | 7 | 3 | forb | perennial |
| Solidago canadensis var. hargeri | Asteraceae | Canada Goldenrod | SOLCAN | native | 1 | 3 | forb | perennial |
| Solidago drummondii | Asteraceae | Drummonds Goldenrod | SOLDRU | native | 8 | 5 | forb | perennial |
| Solidago flexicaulis | Asteraceae | Broad-Leaved Goldenrod | SOLFLE | native | 7 | 3 | forb | perennial |
| Solidago gattingeri | Asteraceae | Gattingers Goldenrod | SOLGAT | native | 10 | 5 | forb | perennial |
| Solidago gigantea | Asteraceae | Late Goldenrod | SOLGIG | native | 3 | -3 | forb | perennial |
| Solidago hispida | Asteraceae | White Goldenrod | SOLHIS | native | 6 | 5 | forb | perennial |
| Solidago juncea | Asteraceae | Early Goldenrod | SOLJUN | native | 4 | 5 | forb | perennial |
| Solidago missouriensis subsp. fasciculata | Asteraceae | Missouri Goldenrod | SOLMIS | native | 6 | 5 | forb | perennial |
| Solidago nemoralis var. longipetiolata | Asteraceae | Old-Field Goldenrod | SOLNEL | native | 2 | 5 | forb | perennial |
| Solidago nemoralis var. nemoralis | Asteraceae | Old-Field Goldenrod | SOLNEN | native | 2 | 5 | forb | perennial |
| Solidago odora | Asteraceae | Sweet Goldenrod | SOLODO | native | 8 | 5 | forb | perennial |
| Solidago patula | Asteraceae | Swamp Goldenrod | SOLPAT | native | 10 | -5 | forb | perennial |
| Solidago petiolaris | Asteraceae | Downy Goldenrod | SOLPET | native | 8 | 5 | forb | perennial |
| Solidago radula | Asteraceae | Rough Goldenrod | SOLRAD | native | 6 | 5 | forb | perennial |
| Solidago rugosa | Asteraceae | Rough-Leaved Goldenrod | SOLRUG | native | 6 | 0 | forb | perennial |
| Solidago speciosa var. rigidiuscula | Asteraceae | Showy Goldenrod | SOLSPR | native | 7 | 5 | forb | perennial |
| Solidago speciosa var. speciosa | Asteraceae | Showy Goldenrod | SOLSPS | native | 7 | 5 | forb | perennial |
| Solidago ulmifolia | Asteraceae | Elm-Leaved Goldenrod | SOLULM | native | 4 | 5 | forb | perennial |
| Sonchus arvensis subsp. arvensis | Asteraceae | Field Sow Thistle | SONARA | non-native | 0 | 3 | forb | perennial |
| Sonchus arvensis subsp. uliginosus | Asteraceae | Common Sow Thistle | SONARU | non-native | 0 | 3 | forb | perennial |
| Sonchus asper | Asteraceae | Spiny Sow Thistle | SONASP | non-native | 0 | 3 | forb | annual |
| Sonchus oleraceus | Asteraceae | Store-Front Sow Thistle | SONOLE | non-native | 0 | 3 | forb | annual |
| Sorghastrum nutans | Poaceae | Indian Grass | SORNUT | native | 4 | 3 | grass | perennial |
| Sorghum bicolor | Poaceae | Sorghum | SORBIC | non-native | 0 | 5 | grass | annual |
| Sorghum halepense | Poaceae | Johnson Grass | SORHAL | non-native | 0 | 3 | grass | perennial |
| Sparganium americanum | Sparganiaceae | American Bur Reed | SPAAME | native | 8 | -5 | forb | perennial |
| Sparganium androcladum | Sparganiaceae | Branching Bur Reed | SPAAND | native | 7 | -5 | forb | perennial |
| Sparganium eurycarpum | Sparganiaceae | Common Bur Reed | SPAEUR | native | 6 | -5 | forb | perennial |
| Spartina pectinata | Poaceae | Prairie Cord Grass | SPAPEC | native | 5 | -3 | grass | perennial |
| Spergula arvensis | Caryophyllaceae | Corn Spurrey | SPEARV | non-native | 0 | 5 | forb | annual |
| Spergularia salina | Caryophyllaceae | Salt Spurrey | SPESAL | non-native | 0 | -5 | forb | annual |
| Spermacoce glabra | Rubiaceae | Smooth Buttonweed | SPEGLA | native | 5 | -3 | forb | perennial |
| Spermolepis divaricata | Apiaceae | Forked Scale-Seed | SPEDIV | native | 0 | 3 | forb | annual |
| Spermolepis echinata | Apiaceae | Bristly-Fruited Spermolepis | SPEECH | native | 3 | 3 | forb | annual |
| Spermolepis inermis | Apiaceae | Scaleseed | SPEINE | native | 3 | 5 | forb | annual |
| Sphaeralcea fendleri | Malvaceae | Plains Globe Mallow | SPHFEN | non-native | 0 | 5 | forb | perennial |
| Sphenoclea zeylandica | Sphenocleaceae | Chickenspike | SPHZEY | non-native | 0 | -5 | forb | annual |
| Sphenopholis nitida | Poaceae | Shining Wedge Grass | SPHNIT | native | 7 | 5 | grass | perennial |
| Sphenopholis obtusata var. major | Poaceae | Slender Wedge Grass | SPHOBM | native | 6 | 0 | grass | perennial |
| Sphenopholis obtusata var. obtusata | Poaceae | Prairie Wedge Grass | SPHOBO | native | 5 | 0 | grass | perennial |
| Sphenopholis pensylvanica | Poaceae | Swamp Oats | SPHPEN | native | 10 | -5 | grass | perennial |
| Spigelia marilandica | Loganiaceae | Pink-Root | SPIMAR | native | 8 | 5 | forb | perennial |
| Spiraea alba | Rosaceae | Meadowsweet | SPIALB | native | 9 | -3 | shrub | perennial |
| Spiraea douglasii | Rosaceae | Douglas Meadow Sweet | SPIDOU | non-native | 0 | 5 | shrub | perennial |
| Spiraea japonica | Rosaceae | Japanese Spiraea | SPIJAP | non-native | 0 | 5 | shrub | perennial |
| Spiraea prunifolia | Rosaceae | Bridal Wreath | SPIPRU | non-native | 0 | 5 | shrub | perennial |
| Spiraea tomentosa | Rosaceae | Steeple Bush | SPITOM | native | 10 | -3 | shrub | perennial |
| Spiraea x vanhouttei | Rosaceae | Garden Spiraea | SPIVAN | non-native | 0 | 5 | shrub | perennial |
| Spiranthes cernua | Orchidaceae | Nodding Ladies Tresses | SPICER | native | 5 | -3 | forb | perennial |
| Spiranthes lacera | Orchidaceae | Slender Ladies Tresses | SPILAC | native | 6 | 0 | forb | perennial |
| Spiranthes lucida | Orchidaceae | Early Ladies Tresses | SPILUC | native | 10 | -3 | forb | perennial |
| Spiranthes magnicamporum | Orchidaceae | Dune Ladiess Tresses | SPIMAG | native | 7 | 3 | forb | perennial |
| Spiranthes ovalis var. erostellata | Orchidaceae | Oval Ladies Tresses | SPIOVA | native | 8 | 0 | forb | perennial |
| Spiranthes tuberosa | Orchidaceae | Little Ladies Tresses | SPITUB | native | 6 | 5 | forb | perennial |
| Spiranthes vernalis | Orchidaceae | Spring Ladies Tresses | SPIVER | native | 8 | 0 | forb | perennial |
| Spirodela polyrhiza | Lemnaceae | Big Duckweed | SPIPOL | native | 5 | -5 | forb | perennial |
| Spirodela punctata | Lemnaceae | Greater Duckweed | SPIPUN | non-native | 0 | -5 | forb | perennial |
| Sporobolus airoides | Poaceae | Fine-Top Salt Grass | SPOAIR | non-native | 0 | 0 | grass | perennial |
| Sporobolus clandestinus | Poaceae | Rough Rush Grass | SPOCLA | native | 5 | 5 | grass | perennial |
| Sporobolus compositus var. compositrus | Poaceae | Rough Dropseed | SPOCOC | native | 3 | 5 | grass | perennial |
| Sporobolus compositus var. drummondii | Poaceae | Rough Dropseed | SPOCOD | native | 4 | 5 | grass | perennial |
| Sporobolus compositus var. macer | Poaceae | Rough Dropseed | SPOCOA | native | 2 | 5 | grass | perennial |
| Sporobolus cryptandrus | Poaceae | Sand Dropseed | SPOCRY | native | 4 | 5 | grass | perennial |
| Sporobolus heterolepis | Poaceae | Prairie Dropseed | SPOHET | native | 6 | 3 | grass | perennial |
| Sporobolus indicus | Poaceae | Smut Grass | SPOIND | non-native | 0 | 3 | grass | perennial |
| Sporobolus neglectus | Poaceae | Small Rush Grass | SPONEG | native | 2 | 5 | grass | annual |
| Sporobolus ozarkanus | Poaceae | Ozark Dropseed | SPOOZA | native | 2 | 5 | grass | annual |
| Sporobolus pyramidatus | Poaceae | Whorled Dropseed | SPOPYR | non-native | 0 | 5 | grass | perennial |
| Sporobolus vaginiflorus | Poaceae | Sheathed Rush Grass | SPOVAG | native | 0 | 5 | grass | annual |
| Stachys aspera | Lamiaceae | Rough Hedge Nteele | STAASP | native | 10 | -3 | forb | perennial |
| Stachys hispida | Lamiaceae | Marsh Hedge Nettle | STAHIS | native | 6 | -3 | forb | perennial |
| Stachys pilosa | Lamiaceae | Woundwort | STAPIL | native | 6 | -3 | forb | perennial |
| Stachys tenuifolia | Lamiaceae | Rough Hedge Nettle | STATEN | native | 4 | -3 | forb | perennial |
| Staphylea trifolia | Staphyleaceae | Bladdernut | STATRI | native | 5 | 0 | shrub | perennial |
| Steinchisma hians | Poaceae | Gaping Panic Grass | STEHIA | native | 7 | -3 | grass | perennial |
| Stellaria graminea | Caryophyllaceae | Common Stitchwort | STELGR | non-native | 0 | 3 | forb | perennial |
| Stellaria longifolia | Caryophyllaceae | Stitchwort | STELON | native | 6 | -3 | forb | perennial |
| Stellaria meadia | Caryophyllaceae | Common Chickweed | STEMEA | non-native | 0 | 3 | forb | annual |
| Stellaria neglecta | Caryophyllaceae | Greater Chickweed | STENEG | non-native | 0 | 3 | forb | annual |
| Stellaria pallida | Caryophyllaceae | Sand Chickweed | STEPAL | non-native | 0 | 3 | forb | annual |
| Stenanthium gramineum | Liliaceae | Featherbells | STENGR | native | 8 | 0 | forb | perennial |
| Stenosiphon linifolius | Onagraceae | False Gaura | STELIN | native | 7 | 5 | forb | biennial |
| Stenotaphrum secundatum | Poaceae | St. Augustine Grass | STESEC | non-native | 0 | 0 | grass | perennial |
| Stipa spartea | Poaceae | Porcupine Grass | STISPA | native | 8 | 5 | grass | perennial |
| Strophostyles helvola var. helvola | Fabaceae | Trailing Wild Bean | STRHEH | native | 2 | 0 | forb | annual |
| Strophostyles helvola var. missouriensis | Fabaceae | Trailing Wild Bean | STRHEM | native | 4 | 0 | forb | annual |
| Strophostyles leiosperma | Fabaceae | Small Wild Bean | STRLEI | native | 2 | 5 | forb | annual |
| Strophostyles umbellata | Fabaceae | Pink Wild Bean | STRUMB | native | 3 | 3 | forb | perennial |
| Stylisma pickeringii var. pattersonii | Convolvulaceae | Pattersons Stylisma | STYPIC | native | 10 | 3 | forb | perennial |
| Stylophorum diphyllum | Papaveraceae | Celandine Poppy | STYDIP | native | 7 | 5 | forb | perennial |
| Stylosanthes biflora | Fabaceae | Pencil Flower | STYBIF | native | 5 | 5 | forb | perennial |
| Styrax americanus | Styracaceae | American Snowbell | STYAME | native | 9 | -5 | shrub | perennial |
| Styrax grandifolius | Styracaceae | Big-Leaf Snowbell | STYGRA | native | 8 | 5 | shrub | perennial |
| Suaeda calceoliformis | Chenopodiaceae | Sea Blite | SUACAL | non-native | 0 | -3 | forb | annual |
| Sullivantia sullivantii | Saxifragaceae | Sullivantia | SULSUL | native | 10 | 5 | forb | perennial |
| Symphoricarpos albus | Caprifoliaceae | Snowberry | SYMALB | non-native | 0 | 3 | shrub | perennial |
| Symphoricarpos occidentalis | Caprifoliaceae | Wolfberry | SYMOCC | native | 10 | 5 | shrub | perennial |
| Symphoricarpos orbiculatus | Caprifoliaceae | Coralberry | SYMORB | native | 1 | 3 | shrub | perennial |
| Symphyotrichum anomalum | Asteraceae | Blue Aster | SYMANO | native | 6 | 5 | forb | perennial |
| Symphyotrichum ciliatum | Asteraceae | Rayless Aster | SYMCIL | non-native | 0 | 0 | forb | annual |
| Symphyotrichum cordifolium | Asteraceae | Heart-Leaved Aster | SYMCOR | native | 7 | 5 | forb | perennial |
| Symphyotrichum drummondii | Asteraceae | Drummonds Aster | SYMDRU | native | 4 | 5 | forb | perennial |
| Symphyotrichum dumosum var. strictior | Asteraceae | Bushy Aster | SYMDUM | native | 7 | 0 | forb | perennial |
| Symphyotrichum ericoides | Asteraceae | Heath Aster | SYMERI | native | 5 | 5 | forb | perennial |
| Symphyotrichum falcatum subsp. commutatum | Asteraceae | White Prairie Aster | SYMFAL | non-native | 0 | 0 | forb | perennial |
| Symphyotrichum laeve | Asteraceae | Smooth Blue Aster | SYMLAE | native | 7 | 5 | forb | perennial |
| Symphyotrichum lanceolatum var. interior | Asteraceae | Marsh Aster | SYMLAI | native | 3 | -3 | forb | perennial |
| Symphyotrichum lanceolatum var. lanceolatum | Asteraceae | Panicled Aster | SYMLAL | native | 3 | -3 | forb | perennial |
| Symphyotrichum lateriflorum | Asteraceae | Side-Flowering Aster | SYMLAT | native | 3 | -3 | forb | perennial |
| Symphyotrichum novae-angliae | Asteraceae | New England Aster | SYMNOV | native | 4 | -3 | forb | perennial |
| Symphyotrichum oblongifolium | Asteraceae | Aromatic Aster | SYMOBL | native | 6 | 5 | forb | perennial |
| Symphyotrichum ontarionis | Asteraceae | Ontario Aster | SYMONT | native | 3 | 0 | forb | perennial |
| Symphyotrichum oolentangiense | Asteraceae | Azure Aster | SYMOOL | native | 7 | 5 | forb | perennial |
| Symphyotrichum parviceps | Asteraceae | Small-Headed Aster | SYMPAR | native | 4 | 5 | forb | perennial |
| Symphyotrichum patens | Asteraceae | Spreading Aster | SYMPAT | native | 5 | 5 | forb | perennial |
| Symphyotrichum pilosum var. pilosum | Asteraceae | Hairy Aster | SYMPIP | native | 0 | 0 | forb | perennial |
| Symphyotrichum pilosum var. pringlei | Asteraceae | Hairy Aster | SYMPIG | native | 2 | 0 | forb | perennial |
| Symphyotrichum praealtum | Asteraceae | Willow Aster | SYMPRA | native | 6 | -3 | forb | perennial |
| Symphyotrichum puniceum | Asteraceae | Swamp Aster | SYMPUN | native | 10 | -5 | forb | perennial |
| Symphyotrichum racemosum var. subdumosum | Asteraceae | Small White Aster | SYMRAC | native | 5 | -3 | forb | perennial |
| Symphyotrichum sericeum | Asteraceae | Silky Aster | SYMSER | native | 9 | 5 | forb | perennial |
| Symphyotrichum subulatum var. ligulatum | Asteraceae | Salt Marsh Aster | SYMSUB | non-native | 0 | -5 | forb | annual |
| Symphyotrichum turbinellum | Asteraceae | Prairie Aster | SYMTUR | native | 6 | 5 | forb | perennial |
| Symphyotrichum urophyllum | Asteraceae | Arrow-Leaved Aster | SYMURO | native | 4 | 5 | forb | perennial |
| Symphyotrichum x amethystinum | Asteraceae | Amethyst Aster | SYMAME | native | 10 | 5 | forb | perennial |
| Symphytum officinale | Boraginaceae | Common Comfrey | SYMOFF | non-native | 0 | 5 | forb | perennial |
| Syringa vulgaris | Oleaceae | Lilac | SYRVUL | non-native | 0 | 5 | shrub | perennial |
| Taenidia integerrima | Apiaceae | Yellow Pimpernel | TAEINT | native | 6 | 5 | forb | perennial |
| Tagetes erecta | Asteraceae | African Marigold | TAGERE | non-native | 0 | 5 | forb | annual |
| Tagetes patula | Asteraceae | French Marigold | TAGPAT | non-native | 0 | 5 | forb | annual |
| Talinum paniculatum | Portulacaceae | Panicled Flameflower | TALPAN | non-native | 0 | 5 | forb | perennial |
| Tamarix ramosissima | Tamaricaceae | French Tamarisk | TAMRAM | non-native | 0 | 5 | shrub | perennial |
| Tanacetum balsamita | Asteraceae | Costmary | TANBAL | non-native | 0 | 5 | forb | perennial |
| Tanacetum parthenium | Asteraceae | Feverfew | TANPAR | non-native | 0 | 5 | forb | perennial |
| Tanacetum vulgare | Asteraceae | Tansy | TANVUL | non-native | 0 | 5 | forb | perennial |
| Taraxacum erythrospermum | Asteraceae | Red-Seeded Dandelion | TARERY | non-native | 0 | 5 | forb | perennial |
| Taraxacum officinale | Asteraceae | Common Dandelion | TAROFF | non-native | 0 | 3 | forb | perennial |
| Taxodium distichum | Cupressaceae | Bald Cypress | TAXDIS | native | 8 | -5 | tree | perennial |
| Tephrosia virginiana | Fabaceae | Goats Rue | TEPVIR | native | 5 | 5 | forb | perennial |
| Tetradium danielii | Rutaceae | Korean Evodia | TETDAN | non-native | 0 | 5 | tree | perennial |
| Teucrium canadense var. canadense | Lamiaceae | Germander | TEUCAC | native | 2 | -3 | forb | perennial |
| Teucrium canadense var. occidentale | Lamiaceae | Germander | TEUCAO | native | 2 | -3 | forb | perennial |
| Thalia dealbata | Marantaceae | Thalia | THADEA | native | 8 | -5 | forb | perennial |
| Thalictrum dasycarpum | Ranunculaceae | Purple Meadow Rue | THADAS | native | 4 | -3 | forb | perennial |
| Thalictrum dioicum | Ranunculaceae | Early Meadow Rue | THADIO | native | 8 | 3 | forb | perennial |
| Thalictrum revolutum | Ranunculaceae | Waxy Meadow Rue | THAREV | native | 5 | 0 | forb | perennial |
| Thalictrum thalictroides | Ranunculaceae | Rue Anemone | THATHA | native | 5 | 3 | forb | perennial |
| Thaspium barbinode | Apiaceae | Hairy Meadow Parsnip | THABAR | native | 7 | 3 | forb | perennial |
| Thaspium trifoliatum var. flavum | Apiaceae | Yellow Meadow Parsnip | THATRF | native | 6 | 5 | forb | perennial |
| Thaspium trifoliatum var. trifoliatum | Apiaceae | Purple Meadow Parsnip | THATRT | native | 6 | 5 | forb | perennial |
| Thelesperma filifolium | Asteraceae | Greenthread | THEFIL | native | 5 | 5 | forb | biennial |
| Thelesperma megapotamicum | Asteraceae | Rayless Greenthread | THEMEG | non-native | 0 | 5 | forb | perennial |
| Thelypteris palustris var. pubescens | Thelypteridaceae | Marsh Fern | THEPAL | native | 10 | -5 | fern | perennial |
| Thlaspi alliaceum | Brassicaceae | Roadside Pennycress | THLALL | non-native | 0 | 5 | forb | annual |
| Thlaspi arvense | Brassicaceae | Field Pennycress | THLARV | non-native | 0 | 5 | forb | annual |
| Tidestromia lanuginosa | Amaranthaceae | Wooly Tidestromia | TIDLAN | non-native | 0 | 5 | forb | annual |
| Tilia americana var. americana | Malvaceae | Basswood | TILAMA | native | 5 | 3 | tree | perennial |
| Tilia americana var. heterophylla | Malvaceae | White Basswood | TILAMH | native | 7 | 3 | tree | perennial |
| Tipularia discolor | Orchidaceae | Crane-Fly Orchid | TIPDIS | native | 10 | 3 | forb | perennial |
| Tiquilia nuttallii | Boraginaceae | Rosette Tiquilia | TIQNUT | non-native | 0 | 3 | forb | perennial |
| Torilis arvensis | Apiaceae | Field Hedge Parsley | TORARV | non-native | 0 | 5 | forb | annual |
| Torilis japonica | Apiaceae | Japanese Hedge Parsley | TORJAP | non-native | 0 | 5 | forb | annual |
| Torilis nodosa | Apiaceae | Knotted Hedge Parsley | TORNOD | non-native | 0 | 5 | forb | annual |
| Torreyochloa pallida | Poaceae | Pale Manna Grass | TORPAL | native | 10 | -5 | grass | perennial |
| Toxicodendron pubescens | Anacardiaceae | Eastern Poison Oak | TOXPUB | native | 7 | 3 | vine | perennial |
| Toxicodendron radicans | Anacardiaceae | Poison Ivy | TOXRAD | native | 1 | 0 | vine | perennial |
| Trachelospermum difforme | Apocynaceae | Climbing Dogbane | TRADIF | native | 6 | -3 | vine | perennial |
| Tradescantia bracteata | Commelinaceae | Long-Bracted Spiderwort | TRABRA | native | 7 | 3 | forb | perennial |
| Tradescantia ernestiana | Commelinaceae | Palmers Spiderwort | TRAERN | native | 8 | 5 | forb | perennial |
| Tradescantia longipes | Commelinaceae | Wild Crocus | TRALON | native | 8 | 5 | forb | perennial |
| Tradescantia ohiensis | Commelinaceae | Common Spiderwort | TRAOHI | native | 3 | 3 | forb | perennial |
| Tradescantia ozarkana | Commelinaceae | Ozark Spiderwort | TRAOZA | native | 10 | 5 | forb | perennial |
| Tradescantia subaspera | Commelinaceae | Zigzag Spiderwort | TRASUB | native | 8 | 5 | forb | perennial |
| Tradescantia tharpii | Commelinaceae | Tharps Spiderwort | TRATHA | native | 9 | 5 | forb | perennial |
| Tradescantia virginiana | Commelinaceae | Virginia Spiderwort | TRAVIR | native | 6 | 3 | forb | perennial |
| Tragia betonicifolia | Euphorbiaceae | Noseburn | TRABET | native | 4 | 5 | forb | perennial |
| Tragia cordata | Euphorbiaceae | Twining Tragia | TRACOR | native | 9 | 5 | forb | perennial |
| Tragia ramosa | Euphorbiaceae | Branching Tragia | TRARAM | native | 7 | 5 | forb | perennial |
| Tragopogon dubius | Asteraceae | Yellow Salsify | TRADUB | non-native | 0 | 5 | forb | biennial |
| Tragopogon porrifolius | Asteraceae | Meadow Salsify | TRAPOR | non-native | 0 | 5 | forb | biennial |
| Tragopogon pratensis | Asteraceae | Common Goats Beard | TRAPRA | non-native | 0 | 5 | forb | biennial |
| Trautvettaria caroliniensis | Ranunculaceae | False Bugbane | TRACAR | native | 10 | -3 | forb | perennial |
| Trepocarpus aethusae | Apiaceae | Whitenymph | TREAET | native | 7 | -5 | forb | annual |
| Triadenum tubulosum | Clusiaceae | Marsh St. Johns Wort | TRITUB | native | 10 | -5 | forb | perennial |
| Triadenum walteri | Clusiaceae | Walters Marsh St. Johns Wort | TRIWAL | native | 9 | -5 | forb | perennial |
| Trianthema portulacastrum | Aizoaceae | Desert Purslane | TRIPOR | non-native | 0 | 3 | forb | perennial |
| Tribulus terrestris | Zygophyllaceae | Caltrop | TRITER | non-native | 0 | 5 | forb | annual |
| Trichophorum planifolium | Cyperaceae | Wood Club-Rush | TRIPLA | native | 9 | 5 | sedge | perennial |
| Trichostema brachiatum | Lamiaceae | False Pennyroyal | TRIBRA | native | 4 | 5 | forb | annual |
| Trichostema dichotomum | Lamiaceae | Blue Curls | TRIDIC | native | 6 | 5 | forb | annual |
| Trichostema setaceum | Lamiaceae | Bristly Blue Curls | TRISET | native | 10 | 5 | forb | annual |
| Tridens flavus var. chapmanii | Poaceae | Chapmans Redtop | TRIFLC | native | 6 | 3 | grass | perennial |
| Tridens flavus var. flavus | Poaceae | False Redtop | TRIFLF | native | 1 | 3 | grass | perennial |
| Tridens muticus var. elongatus | Poaceae | Long-Panicled Three-Toothed Grass | TRIMUT | native | 10 | 5 | grass | perennial |
| Tridens strictus | Poaceae | Longspike Tridens | TRISTC | native | 5 | 3 | grass | perennial |
| Trifolium arvense | Fabaceae | Rabbit-Foot Clover | TRIARV | non-native | 0 | 5 | forb | annual |
| Trifolium aureum | Fabaceae | Yellow Hop Clover | TRIAUR | non-native | 0 | 5 | forb | annual |
| Trifolium campestre | Fabaceae | Low Hop Clover | TRICAM | non-native | 0 | 5 | forb | annual |
| Trifolium carolinianum | Fabaceae | Carolina Clover | TRICAR | native | 10 | 5 | forb | perennial |
| Trifolium dubium | Fabaceae | Little Hop Clover | TRIDUB | non-native | 0 | 3 | forb | annual |
| Trifolium hybridum | Fabaceae | Alsike Clover | TRIHYB | non-native | 0 | 3 | forb | perennial |
| Trifolium incarnatum | Fabaceae | Crimson Clover | TRIINC | non-native | 0 | 5 | forb | annual |
| Trifolium pratense | Fabaceae | Red Clover | TRIPRA | non-native | 0 | 3 | forb | perennial |
| Trifolium reflexum | Fabaceae | Buffalo Clover | TRIREF | native | 8 | 5 | forb | annual |
| Trifolium repens | Fabaceae | White Clover | TRIREP | non-native | 0 | 3 | forb | perennial |
| Trifolium resupinatum | Fabaceae | Persian Clover | TRIRES | non-native | 0 | 5 | forb | annual |
| Trifolium stoloniferum | Fabaceae | Running Buffalo Clover | TRISTO | native | 10 | 5 | forb | perennial |
| Trifolium striatum | Fabaceae | Knotted Clover | TRISTT | non-native | 0 | 5 | forb | annual |
| Trifolium vesciculosum | Fabaceae | Arrowleaf Clover | TRIVES | non-native | 0 | 5 | forb | annual |
| Trillium flexipes | Liliaceae | Declined Trillium | TRIFLE | native | 8 | 0 | forb | perennial |
| Trillium nivale | Liliaceae | Snow Trillium | TRINIV | native | 9 | 5 | forb | perennial |
| Trillium pusillum var. ozarkanum | Liliaceae | Ozark Wake Robin | TRIPUS | native | 9 | 5 | forb | perennial |
| Trillium recurvatum | Liliaceae | Red Trillium | TRIREC | native | 6 | 3 | forb | perennial |
| Trillium sessile | Liliaceae | Toad Trillium | TRISES | native | 5 | 5 | forb | perennial |
| Trillium viride | Liliaceae | Blunt-Leaved Green Trillium | TRIVIE | native | 7 | 5 | forb | perennial |
| Trillium viridescens | Liliaceae | Sharp-Leaved Green Trillium | TRIVIS | native | 7 | 5 | forb | perennial |
| Triodanis biflora | Campanulaceae | Small Venus Looking Glass | TRIBIF | native | 3 | 5 | forb | annual |
| Triodanis holzingeri | Campanulaceae | Holzingers Venus Looking Glass | TRIHOL | native | 10 | 5 | forb | annual |
| Triodanis lamprosperma | Campanulaceae | Shining-Seed Venus Looking Glass | TRILAM | native | 6 | 5 | forb | annual |
| Triodanis leptocarpa | Campanulaceae | Venus Looking Glass | TRILEP | native | 5 | 5 | forb | annual |
| Triodanis perfoliata | Campanulaceae | Perfoliate Venus Looking Glass | TRIPFL | native | 2 | 3 | forb | annual |
| Triosteum angustifolium | Caprifoliaceae | Yellow-Flowered Horse Gentian | TRIOAN | native | 6 | 3 | forb | perennial |
| Triosteum aurantiacum | Caprifoliaceae | Early Horse Gentian | TRIOAU | native | 6 | 5 | forb | perennial |
| Triosteum perfoliatum | Caprifoliaceae | Late Horse Gentian | TRIOPE | native | 4 | 5 | forb | perennial |
| Triphora trianthophora | Orchidaceae | Nodding Pogonia | TRITRI | native | 9 | 0 | forb | perennial |
| Triplasis purpurea | Poaceae | Sand Grass | TRIPUR | native | 7 | 5 | grass | annual |
| Tripleurospermum inodorum | Asteraceae | Scentless Chamomile | TRIINO | non-native | 0 | 5 | forb | annual |
| Tripsacum dactyloides | Poaceae | Gama Grass | TRIDAC | native | 5 | 0 | grass | perennial |
| Trisetum flavescens | Poaceae | Yellow Oats | TRIFLA | non-native | 0 | 5 | grass | perennial |
| Triticum aestivum | Poaceae | Wheat | TRIAES | non-native | 0 | 5 | grass | annual |
| Tsuga canadenis | Pinaceae | Eastern Hemlock | TSUCAN | non-native | 0 | 3 | tree | perennial |
| Turritis glabra | Brassicaceae | Tower Mustard | TURGLA | native | 8 | 5 | forb | biennial |
| Typha angustifolia | Typhaceae | Narrow-Leaved Cattail | TYPANG | native | 0 | -5 | forb | perennial |
| Typha domingensis | Typhaceae | Southern Cattail | TYPDOM | native | 2 | -5 | forb | perennial |
| Typha latifolia | Typhaceae | Common Cattail | TYPLAT | native | 1 | -5 | forb | perennial |
| Typha x glauca | Typhaceae | Blue Cattail | TYPGLA | native | 0 | -5 | forb | perennial |
| Ulmus alata | Ulmaceae | Winged Elm | ULMALA | native | 4 | 3 | tree | perennial |
| Ulmus americana | Ulmaceae | American Elm | ULMAME | native | 4 | 0 | tree | perennial |
| Ulmus crassifolia | Ulmaceae | Cedar Elm | ULMCRA | native | 10 | 0 | tree | perennial |
| Ulmus minor | Ulmaceae | English Elm | ULMMIN | non-native | 0 | 5 | tree | perennial |
| Ulmus pumila | Ulmaceae | Siberian Elm | ULMPUM | non-native | 0 | 3 | tree | perennial |
| Ulmus rubra | Ulmaceae | Slippery Elm | ULMRUB | native | 5 | 0 | tree | perennial |
| Ulmus thomasi | Ulmaceae | Rock Elm | ULMTHO | native | 10 | 0 | tree | perennial |
| Ulmus x intermedia | Ulmaceae | Hybrid Elm | ULMINT | non-native | 0 | 5 | tree | perennial |
| Urochloa platyphylla | Poaceae | Fringed Signal Grass | UROPLA | non-native | 0 | 0 | grass | annual |
| Urochloa ramosa | Poaceae | Browntop Millet | URORAM | non-native | 0 | 3 | grass | annual |
| Urochloa texana | Poaceae | Texas Millet | UROTEX | non-native | 0 | 5 | grass | annual |
| Urtica chamaedryoides | Urticaceae | Nettle | URTCHA | native | 8 | 3 | forb | annual |
| Urtica dioica subsp. dioica | Urticaceae | European Nettle | URTDID | non-native | 0 | 0 | forb | perennial |
| Urtica dioica subsp. gracilis | Urticaceae | Tall Nettle | URTDIG | native | 3 | 0 | forb | perennial |
| Urtica urens | Urticaceae | Burning Nettle | URTURE | non-native | 0 | 5 | forb | annual |
| Utricularia gibba | Lentibulariaceae | Humped Bladderwort | UTRGIB | native | 6 | -5 | forb | perennial |
| Utricularia minor | Lentibulariaceae | Lesser Bladderwort | UTRMIN | native | 10 | -5 | forb | perennial |
| Utricularia subulata | Lentibulariaceae | Hair Bladderwort | UTRSUB | native | 10 | -5 | forb | perennial |
| Utricularia vulgaris subsp. macrorhiza | Lentibulariaceae | Great Bladderwort | UTRVUL | native | 7 | -5 | forb | perennial |
| Uvularia grandiflora | Liliaceae | Bellwort | UVUGRA | native | 6 | 5 | forb | perennial |
| Uvularia sessilifolia | Liliaceae | Little Bellwort | UVUSES | native | 8 | 3 | forb | perennial |
| Vaccaria hispanica | Caryophyllaceae | Cow Herb | VACHIS | non-native | 0 | 5 | forb | annual |
| Vaccinium arboreum | Ericaceae | Farkleberry | VACARB | native | 6 | 3 | shrub | perennial |
| Vaccinium corymbosum | Ericaceae | Highbush Blueberry | VACCOR | non-native | 0 | -3 | shrub | perennial |
| Vaccinium pallidum | Ericaceae | Late Low Blueberry | VACPAL | native | 4 | 5 | shrub | perennial |
| Vaccinium stamineum | Ericaceae | Deerberry | VACSTA | native | 6 | 3 | shrub | perennial |
| Valerianella locusta | Valerianaceae | Corn Salad | VALLOC | non-native | 0 | 5 | forb | annual |
| Valerianella ozarkana | Valerianaceae | Ozark Corn Salad | VALOZA | native | 8 | 5 | forb | annual |
| Valerianella radiata | Valerianaceae | Beaked Corn Salad | VALRAD | native | 0 | 0 | forb | annual |
| Vallisneria americana | Hydrocharitaceae | Eel Grass | VALAME | native | 10 | -5 | forb | perennial |
| Veratrum woodii | Liliaceae | False Hellebore | VERWOO | native | 8 | 5 | forb | perennial |
| Verbascum blattaria | Scrophulariaceae | Moth Mullein | VERBLA | non-native | 0 | 3 | forb | biennial |
| Verbascum lychnitis | Scrophulariaceae | White Mullein | VERLYC | non-native | 0 | 5 | forb | biennial |
| Verbascum phlomoides | Scrophulariaceae | Clasping Mullein | VERPHL | non-native | 0 | 5 | forb | biennial |
| Verbascum thapsus | Scrophulariaceae | Common Mullein | VERTHA | non-native | 0 | 5 | forb | biennial |
| Verbena bonariensis | Verbenaceae | Garden Vervain | VERBON | non-native | 0 | 3 | forb | annual |
| Verbena bracteata | Verbenaceae | Creeping Vervain | VERBRC | native | 0 | 3 | forb | perennial |
| Verbena brasiliensis | Verbenaceae | Brazilian Vervain | VERBRS | non-native | 0 | 5 | forb | perennial |
| Verbena hastata | Verbenaceae | Blue Vervain | VERHAS | native | 4 | -3 | forb | perennial |
| Verbena simplex | Verbenaceae | Narrow-Leaved Vervain | VERSIM | native | 3 | 5 | forb | perennial |
| Verbena stricta | Verbenaceae | Hoary Vervain | VERSTR | native | 2 | 5 | forb | perennial |
| Verbena urticifolia | Verbenaceae | White Vervain | VERURT | native | 2 | 0 | forb | perennial |
| Verbesina alternifolia | Asteraceae | Wingstem | VERALT | native | 4 | -3 | forb | perennial |
| Verbesina encelioides | Asteraceae | Golden Crownbeard | VERENC | non-native | 0 | 3 | forb | annual |
| Verbesina helianthoides | Asteraceae | Yellow Crownbeard | VERHEL | native | 5 | 5 | forb | perennial |
| Verbesina virginica | Asteraceae | White Crownbeard | VERBVI | native | 5 | 3 | forb | perennial |
| Vernonia arkansana | Asteraceae | Great Ironweed | VERARK | native | 7 | 0 | forb | perennial |
| Vernonia baldwinii | Asteraceae | Western Ironweed | VERBAL | native | 2 | 5 | forb | perennial |
| Vernonia fasciculata | Asteraceae | Common Ironweed | VERFAS | native | 7 | -3 | forb | perennial |
| Vernonia gigantea | Asteraceae | Tall Ironweed | VERGIG | native | 6 | 0 | forb | perennial |
| Vernonia missurica | Asteraceae | Missouri Ironweed | VERMIS | native | 5 | 0 | forb | perennial |
| Veronica americana | Plantaginaceae | American Brooklime | VERAME | native | 10 | -5 | forb | perennial |
| Veronica anagallis-aquatica | Plantaginaceae | Blue Water Speedwell | VERANA | non-native | 0 | -5 | forb | perennial |
| Veronica arvensis | Plantaginaceae | Corn Speedwell | VERARV | non-native | 0 | 3 | forb | annual |
| Veronica beccabunga | Plantaginaceae | Brooklime | VERBEC | non-native | 0 | -5 | forb | perennial |
| Veronica catenata | Plantaginaceae | Water Speedwell | VERCAT | native | 10 | -5 | forb | perennial |
| Veronica chamaedrys | Plantaginaceae | Germander Speedwell | VERCHA | non-native | 0 | 5 | forb | perennial |
| Veronica hederifolia | Plantaginaceae | Ivy-Leaved Speedwell | VERHED | non-native | 0 | 5 | forb | annual |
| Veronica longifolia | Plantaginaceae | Garden Speedwell | VERLON | non-native | 0 | 5 | forb | perennial |
| Veronica peregrina | Plantaginaceae | Puslane Speedwell | VERPEG | native | 0 | 0 | forb | annual |
| Veronica persica | Plantaginaceae | Birds Eye | VERPES | non-native | 0 | 5 | forb | annual |
| Veronica polita | Plantaginaceae | Wayside Speedwell | VERPOL | non-native | 0 | 5 | forb | annual |
| Veronica scheerei | Plantaginaceae | Creeping Speedwell | VERSCH | non-native | 0 | 5 | forb | perennial |
| Veronica serpyllifolia | Plantaginaceae | Thyme-Leaved Speedwell | VERSER | non-native | 0 | 0 | forb | perennial |
| Veronicastrum virginicum | Plantaginaceae | Culvers Root | VEROVI | native | 7 | 0 | forb | perennial |
| Veronica teucrium | Plantaginaceae | Saw-Leaved Speedwell | VERTEU | non-native | 0 | 5 | forb | perennial |
| Veronica triphyllos | Plantaginaceae | Finger Speedwell | VERTRI | non-native | 0 | 5 | forb | annual |
| Viburnum bracteatum | Caprifoliaceae | Ozark Arrowwood | VIBBRA | native | 10 | 5 | shrub | perennial |
| Viburnum dentatum | Caprifoliaceae | Southern Arrow-Wood | VIBDEN | native | 10 | 0 | shrub | perennial |
| Viburnum lantana | Caprifoliaceae | Wayfaring Tree | VIBLAN | non-native | 0 | 5 | shrub | perennial |
| Viburnum lentago | Caprifoliaceae | Nannyberry | VIBLEN | native | 5 | 0 | shrub | perennial |
| Viburnum molle | Caprifoliaceae | Arrow-Wood | VIBMOL | native | 8 | 5 | shrub | perennial |
| Viburnum opulus var. opulus | Caprifoliaceae | European Highbush Cranberry | VIBOPU | non-native | 0 | 0 | shrub | perennial |
| Viburnum prunifolium | Caprifoliaceae | Black Haw | VIBPRU | native | 4 | 3 | shrub | perennial |
| Viburnum rafinesquianum | Caprifoliaceae | Downy Arrow-Wood | VIBRAF | native | 7 | 5 | shrub | perennial |
| Viburnum recognitum | Caprifoliaceae | Smooth Arrow-Wood | VIBREC | native | 3 | 0 | shrub | perennial |
| Viburnum rufidulum | Caprifoliaceae | Southern Black Haw | VIBRUF | native | 4 | 5 | shrub | perennial |
| Vicia americana | Fabaceae | American Vetch | VICAME | native | 8 | 3 | forb | perennial |
| Vicia caroliniana | Fabaceae | Wood Vetch | VICCAR | native | 6 | 5 | forb | perennial |
| Vicia cracca | Fabaceae | Cow Vetch | VICCRA | non-native | 0 | 5 | forb | perennial |
| Vicia grandiflora | Fabaceae | Big Flower Vetch | VICGRA | non-native | 0 | 5 | forb | annual |
| Vicia hirsuta | Fabaceae | Tiny Vetch | VICHIR | non-native | 0 | 5 | forb | annual |
| Vicia ludoviciana | Fabaceae | Deer Pea Vetch | VICLUD | native | 10 | 5 | forb | annual |
| Vicia minutiflora | Fabaceae | Pygmy-Flowered Vetch | VICMIN | native | 7 | 5 | forb | annual |
| Vicia sativa subsp. nigra | Fabaceae | Common Vetch | VICSAT | non-native | 0 | 3 | forb | annual |
| Vicia villosa subsp. varia | Fabaceae | Woolly-Pod Vetch | VICVIA | non-native | 0 | 5 | forb | annual |
| Vicia villosa subsp. villosa | Fabaceae | Hairy Vetch | VICVII | non-native | 0 | 5 | forb | annual |
| Vigna unguiculata | Fabaceae | Cowpea | VIGUNG | non-native | 0 | 5 | forb | annual |
| Vinca major | Apocynaceae | Greater Periwinkle | VINMAJ | non-native | 0 | 5 | shrub | perennial |
| Vinca minor | Apocynaceae | Common Periwinkle | VINMIN | non-native | 0 | 5 | shrub | perennial |
| Viola affinis | Violaceae | Sand Violet | VIOAFF | native | 10 | -3 | forb | perennial |
| Viola arvensis | Violaceae | Field Pansy | VIOARV | non-native | 0 | 5 | forb | annual |
| Viola bicolor | Violaceae | Johnny Jump Up | VIOBIC | native | 0 | 3 | forb | annual |
| Viola cucullata | Violaceae | Hooded Violet | VIOCUC | native | 10 | -5 | forb | perennial |
| Viola lanceolata | Violaceae | Lance-Leaved Violet | VIOLAN | native | 7 | -5 | forb | perennial |
| Viola missouriensis | Violaceae | Missouri Violet | VIOMIS | native | 6 | 0 | forb | perennial |
| Viola nephrophylla | Violaceae | Blue Prairie Violet | VIONEP | native | 3 | -3 | forb | perennial |
| Viola pallens | Violaceae | Smooth White Violet | VIOPAN | native | 10 | -5 | forb | perennial |
| Viola palmata | Violaceae | Three-Leaved Violet | VIOPAT | native | 5 | 3 | forb | perennial |
| Viola pedata | Violaceae | Birds Foot Violet | VIOPEA | native | 5 | 5 | forb | perennial |
| Viola pedatifida | Violaceae | Prairie Violet | VIOPEF | native | 10 | 3 | forb | perennial |
| Viola pubescens | Violaceae | Smooth Yellow Violet | VIOPUB | native | 5 | 3 | forb | perennial |
| Viola sagittata | Violaceae | Arrow-Leaved Violet | VIOSAG | native | 6 | 0 | forb | perennial |
| Viola sororia | Violaceae | Hairy Wood Violet | VIOSOR | native | 2 | 0 | forb | perennial |
| Viola striata | Violaceae | Cream Violet | VIOSTR | native | 3 | -3 | forb | perennial |
| Viola tricolor | Violaceae | Pansy Violet | VIOTRI | non-native | 0 | 5 | forb | annual |
| Viola viarum | Violaceae | Plains Violet | VIOVIA | native | 7 | 3 | forb | perennial |
| Vitex negundo | Lamiaceae | Chinese Chaste Tree | VITNEG | non-native | 0 | 5 | shrub | perennial |
| Vitis aestivalis | Vitaceae | Summer Grape | VITAES | native | 5 | 3 | vine | perennial |
| Vitis cinerea | Vitaceae | Winter Grape | VITCIN | native | 3 | 3 | vine | perennial |
| Vitis labruscana | Vitaceae | Fox Grape | VITLAB | non-native | 0 | 3 | vine | perennial |
| Vitis palmata | Vitaceae | Red Grape | VITPAL | native | 6 | -5 | vine | perennial |
| Vitis riparia | Vitaceae | Riverbank Grape | VITRIP | native | 4 | -3 | vine | perennial |
| Vitis rotundifolia | Vitaceae | Muscadine Grape | VITROT | native | 10 | 0 | vine | perennial |
| Vitis rupestris | Vitaceae | Sand Grape | VITRUP | native | 7 | 3 | vine | perennial |
| Vitis vulpina | Vitaceae | Frost Grape | VITVUL | native | 5 | 0 | vine | perennial |
| Vulpia bromoides | Poaceae | Brome-Like Fescue | VULBRO | non-native | 0 | 5 | grass | annual |
| Vulpia elliotea | Poaceae | Squirrel-Tail Fescue | VULELL | native | 3 | 5 | grass | annual |
| Vulpia myuros | Poaceae | Mouse-Tail Fescue | VULMYU | non-native | 0 | 3 | grass | annual |
| Vulpia octoflora var. glauca | Poaceae | Six-Weeks Fescue | VULOCG | native | 2 | 3 | grass | annual |
| Vulpia octoflora var. octoflora | Poaceae | Six-Weeks Fescue | VULOCO | native | 3 | 3 | grass | annual |
| Wisteria frutescens | Fabaceae | Wisteria | WISFRU | native | 4 | -3 | vine | perennial |
| Wisteria sinensis | Fabaceae | Chinese Wisteria | WISSIN | non-native | 0 | 5 | vine | perennial |
| Wolffia borealis | Lemnaceae | Dotted Water Meal | WOLBOR | native | 9 | -5 | forb | perennial |
| Wolffia braseliensis | Lemnaceae | Pointed Water Meal | WOLBRA | native | 8 | -5 | forb | perennial |
| Wolffia columbiana | Lemnaceae | Common Water Meal | WOLCOL | native | 7 | -5 | forb | perennial |
| Wolffiella gladiata | Lemnaceae | Mud Midget | WOLGLA | native | 10 | -5 | forb | perennial |
| Woodsia obtusa | Dryopteridaceae | Cliff Fern | WOOOBT | native | 5 | 5 | fern | perennial |
| Woodwardia areolata | Blechnaceae | Netted Chain Fern | WOOARE | native | 9 | -3 | fern | perennial |
| Xanthium spinosum | Asteraceae | Spiny Cocklebur | XANSPI | non-native | 0 | 3 | forb | annual |
| Xanthium strumarium | Asteraceae | Cocklebur | XANSTR | native | 0 | 0 | forb | annual |
| Xyris jupicai | Xyridaceae | Tall Yellow-Eyed Grass | XYRJUP | native | 10 | -5 | forb | annual |
| Xyris torta | Xyridaceae | Yellow-Eyed Grass | XYRTOR | native | 8 | -5 | forb | perennial |
| Yucca arkansana | Agavaceae | Soft Soapweed | YUCARK | native | 9 | 5 | shrub | perennial |
| Yucca glauca | Agavaceae | Soapweed | YUCGLA | native | 10 | 5 | shrub | perennial |
| Yucca smalliana | Agavaceae | Adams Needle | YUCSMA | non-native | 0 | 5 | shrub | perennial |
| Zannichellia palustris | Zanichelliaceae | Horned Pondweed | ZANPAL | native | 8 | -5 | forb | perennial |
| Zanthoxylum americanum | Rutaceae | Prickly Ash | ZANAME | native | 4 | 3 | shrub | perennial |
| Zea mays | Poaceae | Corn | ZEAMAY | non-native | 0 | 5 | grass | annual |
| Zeltnera calycosa | Gentianaceae | Arizona Centaury | ZELCAL | non-native | 0 | -3 | forb | annual |
| Zeltnera texensis | Gentianaceae | Lady Birds Centaury | ZELTEX | native | 9 | 5 | forb | annual |
| Zigadenus elegans subsp. glaucus | Liliaceae | White Camas | ZIGELE | native | 10 | 0 | forb | perennial |
| Zigadenus nuttallii | Liliaceae | Death Camas | ZIGNUT | native | 10 | 5 | forb | perennial |
| Zizania aquatica | Poaceae | Wild Rice | ZIZAQU | non-native | 0 | -5 | grass | annual |
| Zizania palustris var. interior | Poaceae | Inland Wild Rice | ZIZPAL | native | 10 | -5 | grass | annual |
| Zizaniopsis miliacea | Poaceae | Water Millet | ZIZMIL | native | 9 | -5 | grass | perennial |
| Zizia aptera | Apiaceae | Heart-Leaved Meadow Parsnip | ZIZAPT | native | 7 | 3 | forb | perennial |
| Zizia aurea | Apiaceae | Golden Alexanders | ZIZAUR | native | 5 | 0 | forb | perennial |
A total of 2960 rows are displayed.