List of Oklahoma Plants
| Plant Name | Scientific Name | Plant CD | Family | Type |
|---|---|---|---|---|
| acacia | Acacia | ACACI | Fabaceae | Dicot |
| Adam and Eve | Aplectrum | APLEC | Orchidaceae | Monocot |
| Adam and Eve | Aplectrum hyemale | APHY | Orchidaceae | Monocot |
| adder"s-mouth orchid | Malaxis | MALAX | Orchidaceae | Monocot |
| adderstongue | Ophioglossum | OPHIO | Ophioglossaceae | Fern |
| Addison"s rosette grass | Dichanthelium ovale var. addisonii | DIOVA | Poaceae | Monocot |
| Adonis blazingstar | Mentzelia multiflora | MEMU3 | Loasaceae | Dicot |
| Adonis blazingstar | Mentzelia multiflora var. multiflora | MEMUM2 | Loasaceae | Dicot |
| agrimony | Agrimonia | AGRIM | Rosaceae | Dicot |
| ailanthus | Ailanthus | AILAN | Simaroubaceae | Dicot |
| Alabama lipfern | Cheilanthes alabamensis | CHAL5 | Pteridaceae | Fern |
| Alabama serviceberry | Amelanchier arborea var. alabamensis | AMARA3 | Rosaceae | Dicot |
| Alabama supplejack | Berchemia scandens | BESC | Rhamnaceae | Dicot |
| albizia | Albizia | ALBIZ | Fabaceae | Dicot |
| alder | Alnus | ALNUS | Betulaceae | Dicot |
| alderleaf mountain mahogany | Cercocarpus montanus | CEMO2 | Rosaceae | Dicot |
| alderleaf mountain mahogany | Cercocarpus montanus var. montanus | CEMOM4 | Rosaceae | Dicot |
| alfalfa | Medicago sativa | MESA | Fabaceae | Dicot |
| alfalfa | Medicago sativa ssp. sativa | MESAS | Fabaceae | Dicot |
| alfalfa | Medicago | MEDIC | Fabaceae | Dicot |
| alkali buttercup | Ranunculus cymbalaria | RACY | Ranunculaceae | Dicot |
| alkali mallow | Malvella leprosa | MALE3 | Malvaceae | Dicot |
| alkali sacaton | Sporobolus airoides | SPAI | Poaceae | Monocot |
| alkali yellowtops | Flaveria campestris | FLCA | Asteraceae | Dicot |
| alkaliweed | Cressa | CRESS | Convolvulaceae | Dicot |
| Allegheny blackberry | Rubus allegheniensis | RUAL | Rosaceae | Dicot |
| Allegheny blackberry | Rubus allegheniensis var. allegheniensis | RUALA | Rosaceae | Dicot |
| Allegheny monkeyflower | Mimulus ringens | MIRI | Scrophulariaceae | Dicot |
| Allegheny monkeyflower | Mimulus ringens var. ringens | MIRIR | Scrophulariaceae | Dicot |
| alliaria | Alliaria | ALLIA | Brassicaceae | Dicot |
| alligator-flag | Thalia | THALI | Marantaceae | Monocot |
| alligatorweed | Alternanthera philoxeroides | ALPH | Amaranthaceae | Dicot |
| alophia | Alophia | ALOPH | Iridaceae | Monocot |
| alsike clover | Trifolium hybridum | TRHY | Fabaceae | Dicot |
| alumroot | Heuchera | HEUCH | Saxifragaceae | Dicot |
| amberique-bean | Strophostyles helvola | STHE9 | Fabaceae | Dicot |
| American alumroot | Heuchera americana | HEAM6 | Saxifragaceae | Dicot |
| American alumroot | Heuchera americana var. americana | HEAMA2 | Saxifragaceae | Dicot |
| American alumroot | Heuchera americana var. hirsuticaulis | HEAMH | Saxifragaceae | Dicot |
| American basswood | Tilia americana | TIAM | Tiliaceae | Dicot |
| American basswood | Tilia americana var. americana | TIAMA | Tiliaceae | Dicot |
| American beakgrain | Diarrhena americana | DIAM | Poaceae | Monocot |
| American beautyberry | Callicarpa americana | CAAM2 | Verbenaceae | Dicot |
| American beech | Fagus grandifolia | FAGR | Fagaceae | Dicot |
| American bellflower | Campanulastrum americanum | CAAM18 | Campanulaceae | Dicot |
| American bird"s-foot trefoil | Lotus unifoliolatus | LOUN | Fabaceae | Dicot |
| American bird"s-foot trefoil | Lotus unifoliolatus var. unifoliolatus | LOUNU | Fabaceae | Dicot |
| American bittersweet | Celastrus scandens | CESC | Celastraceae | Dicot |
| American black elderberry | Sambucus nigra ssp. canadensis | SANIC4 | Caprifoliaceae | Dicot |
| American bladdernut | Staphylea trifolia | STTR | Staphyleaceae | Dicot |
| American bluehearts | Buchnera americana | BUAM | Scrophulariaceae | Dicot |
| American buckwheat vine | Brunnichia ovata | BROV4 | Polygonaceae | Dicot |
| American bugseed | Corispermum americanum | COAM8 | Chenopodiaceae | Dicot |
| American bugseed | Corispermum americanum var. americanum | COAMA2 | Chenopodiaceae | Dicot |
| American bugseed | Corispermum americanum var. rydbergii | COAMR | Chenopodiaceae | Dicot |
| American bur-reed | Sparganium americanum | SPAM | Sparganiaceae | Monocot |
| American burnweed | Erechtites hieraciifolia | ERHI2 | Asteraceae | Dicot |
| American burnweed | Erechtites hieraciifolia var. hieraciifolia | ERHIH | Asteraceae | Dicot |
| American columbo | Frasera caroliniensis | FRCA2 | Gentianaceae | Dicot |
| American common reed | Phragmites australis ssp. americanus | PHAUA6 | Poaceae | Monocot |
| American cupscale | Sacciolepis striata | SAST | Poaceae | Monocot |
| American eelgrass | Vallisneria americana | VAAM3 | Hydrocharitaceae | Monocot |
| American elm | Ulmus americana | ULAM | Ulmaceae | Dicot |
| American false pennyroyal | Hedeoma pulegioides | HEPU | Lamiaceae | Dicot |
| American featherfoil | Hottonia inflata | HOIN | Primulaceae | Dicot |
| American ginseng | Panax quinquefolius | PAQU | Araliaceae | Dicot |
| American hazelnut | Corylus americana | COAM3 | Betulaceae | Dicot |
| American hogpeanut | Amphicarpaea bracteata | AMBR2 | Fabaceae | Dicot |
| American hogpeanut | Amphicarpaea bracteata var. bracteata | AMBRB | Fabaceae | Dicot |
| American hogpeanut | Amphicarpaea bracteata var. comosa | AMBRC | Fabaceae | Dicot |
| American holly | Ilex opaca | ILOP | Aquifoliaceae | Dicot |
| American holly | Ilex opaca var. opaca | ILOPO | Aquifoliaceae | Dicot |
| American hornbeam | Carpinus caroliniana | CACA18 | Betulaceae | Dicot |
| American hornbeam | Carpinus caroliniana ssp. caroliniana | CACAC2 | Betulaceae | Dicot |
| American hornbeam | Carpinus caroliniana ssp. virginiana | CACAV | Betulaceae | Dicot |
| American ipecac | Gillenia stipulata | GIST5 | Rosaceae | Dicot |
| American licorice | Glycyrrhiza lepidota | GLLE3 | Fabaceae | Dicot |
| American lopseed | Phryma leptostachya | PHLE5 | Verbenaceae | Dicot |
| American lotus | Nelumbo lutea | NELU | Nelumbonaceae | Dicot |
| American pillwort | Pilularia americana | PIAM | Marsileaceae | Fern |
| American plum | Prunus americana | PRAM | Rosaceae | Dicot |
| American pokeweed | Phytolacca americana | PHAM4 | Phytolaccaceae | Dicot |
| American pokeweed | Phytolacca americana var. americana | PHAMA3 | Phytolaccaceae | Dicot |
| American red raspberry | Rubus idaeus | RUID | Rosaceae | Dicot |
| American smoketree | Cotinus obovatus | COOB2 | Anacardiaceae | Dicot |
| American snowbell | Styrax americanus | STAM4 | Styracaceae | Dicot |
| American speedwell | Veronica americana | VEAM2 | Scrophulariaceae | Dicot |
| American spongeplant | Limnobium spongia | LISP2 | Hydrocharitaceae | Monocot |
| American star-thistle | Centaurea americana | CEAM2 | Asteraceae | Dicot |
| American sycamore | Platanus occidentalis | PLOC | Platanaceae | Dicot |
| American vetch | Vicia americana | VIAM | Fabaceae | Dicot |
| American vetch | Vicia americana ssp. americana | VIAMA3 | Fabaceae | Dicot |
| American water horehound | Lycopus americanus | LYAM | Lamiaceae | Dicot |
| American water plantain | Alisma subcordatum | ALSU | Alismataceae | Monocot |
| American water-willow | Justicia americana | JUAM | Acanthaceae | Dicot |
| American waterwort | Elatine americana | ELAM3 | Elatinaceae | Dicot |
| American white waterlily | Nymphaea odorata | NYOD | Nymphaeaceae | Dicot |
| American white waterlily | Nymphaea odorata ssp. odorata | NYODO | Nymphaeaceae | Dicot |
| American white waterlily | Nymphaea odorata ssp. tuberosa | NYODT | Nymphaeaceae | Dicot |
| American wild carrot | Daucus pusillus | DAPU3 | Apiaceae | Dicot |
| American wisteria | Wisteria frutescens | WIFR | Fabaceae | Dicot |
| American witchhazel | Hamamelis virginiana | HAVI4 | Hamamelidaceae | Dicot |
| amianthium | Amianthium | AMIAN | Liliaceae | Monocot |
| Andean prairie clover | Dalea cylindriceps | DACY | Fabaceae | Dicot |
| anemone | Anemone | ANEMO | Ranunculaceae | Dicot |
| angelica | Angelica | ANGEL | Apiaceae | Dicot |
| anglestem beaksedge | Rhynchospora caduca | RHCA9 | Cyperaceae | Monocot |
| anglestem primrose-willow | Ludwigia leptocarpa | LULE4 | Onagraceae | Dicot |
| angularfruit milkvine | Matelea gonocarpos | MAGO | Asclepiadaceae | Dicot |
| anisescented goldenrod | Solidago odora | SOOD | Asteraceae | Dicot |
| anisescented goldenrod | Solidago odora var. odora | SOODO | Asteraceae | Dicot |
| annual bluegrass | Poa annua | POAN | Poaceae | Monocot |
| annual buckwheat | Eriogonum annuum | ERAN4 | Polygonaceae | Dicot |
| annual canarygrass | Phalaris canariensis | PHCA5 | Poaceae | Monocot |
| annual fescue | Vulpia myuros | VUMY | Poaceae | Monocot |
| annual fimbry | Fimbristylis annua | FIAN | Cyperaceae | Monocot |
| annual marsh elder | Iva annua | IVAN2 | Asteraceae | Dicot |
| annual marsh elder | Iva annua var. annua | IVANA | Asteraceae | Dicot |
| annual phlox | Phlox drummondii | PHDR | Polemoniaceae | Dicot |
| annual phlox | Phlox drummondii ssp. drummondii | PHDRD | Polemoniaceae | Dicot |
| annual rabbitsfoot grass | Polypogon monspeliensis | POMO5 | Poaceae | Monocot |
| annual ragweed | Ambrosia artemisiifolia | AMAR2 | Asteraceae | Dicot |
| annual ragweed | Ambrosia artemisiifolia var. elatior | AMARE | Asteraceae | Dicot |
| annual silver hairgrass | Aira elegans | AIEL4 | Poaceae | Monocot |
| annual trampweed | Facelis retusa | FARE | Asteraceae | Dicot |
| annual vernalgrass | Anthoxanthum aristatum | ANAR7 | Poaceae | Monocot |
| annual yellow sweetclover | Melilotus indicus | MEIN2 | Fabaceae | Dicot |
| antelopehorns | Asclepias asperula ssp. capricornu | ASASC | Asclepiadaceae | Dicot |
| Apache plume | Fallugia | FALLU | Rosaceae | Dicot |
| Apache plume | Fallugia paradoxa | FAPA | Rosaceae | Dicot |
| Appalachian blazing star | Liatris squarrulosa | LISQ2 | Asteraceae | Dicot |
| Appalachian cliff fern | Woodsia appalachiana | WOAP | Dryopteridaceae | Fern |
| apple | Malus | MALUS | Rosaceae | Dicot |
| apple of Peru | Nicandra physalodes | NIPH | Solanaceae | Dicot |
| arctic rush | Juncus arcticus | JUAR2 | Juncaceae | Monocot |
| Arizona centaury | Centaurium calycosum | CECA3 | Gentianaceae | Dicot |
| Arizona cottontop | Digitaria californica | DICA8 | Poaceae | Monocot |
| Arizona threeawn | Aristida arizonica | ARAR6 | Poaceae | Monocot |
| Arizona walnut | Juglans major | JUMA | Juglandaceae | Dicot |
| Arkansas beardtongue | Penstemon arkansanus | PEAR4 | Scrophulariaceae | Dicot |
| Arkansas bedstraw | Galium arkansanum | GAAR4 | Rubiaceae | Dicot |
| Arkansas dozedaisy | Aphanostephus skirrhobasis | APSK | Asteraceae | Dicot |
| Arkansas dozedaisy | Aphanostephus skirrhobasis var. skirrhobasis | APSKS | Asteraceae | Dicot |
| Arkansas ironweed | Vernonia arkansana | VEAR3 | Asteraceae | Dicot |
| Arkansas leastdaisy | Chaetopappa asteroides | CHAS | Asteraceae | Dicot |
| Arkansas leastdaisy | Chaetopappa asteroides var. asteroides | CHASA | Asteraceae | Dicot |
| Arkansas mannagrass | Glyceria arkansana | GLAR | Poaceae | Monocot |
| Arkansas meadow-rue | Thalictrum arkansanum | THAR | Ranunculaceae | Dicot |
| Arkansas sedge | Carex arkansana | CAAR5 | Cyperaceae | Monocot |
| Arkansas yucca | Yucca arkansana | YUAR2 | Agavaceae | Monocot |
| arnica | Arnica | ARNIC | Asteraceae | Dicot |
| aromatic aster | Symphyotrichum oblongifolium | SYOB | Asteraceae | Dicot |
| arrow arum | Peltandra | PELTA | Araceae | Monocot |
| arrowfeather threeawn | Aristida purpurascens | ARPU8 | Poaceae | Monocot |
| arrowfeather threeawn | Aristida purpurascens var. purpurascens | ARPUP4 | Poaceae | Monocot |
| arrowgrass | Triglochin | TRIGL | Juncaginaceae | Monocot |
| arrowhead | Sagittaria | SAGIT | Alismataceae | Monocot |
| arrowhead rattlebox | Crotalaria sagittalis | CRSA4 | Fabaceae | Dicot |
| arrowleaf clover | Trifolium vesiculosum | TRVE | Fabaceae | Dicot |
| arrowleaf tearthumb | Polygonum sagittatum | POSA5 | Polygonaceae | Dicot |
| arrowleaf violet | Viola sagittata | VISA2 | Violaceae | Dicot |
| arrowleaf violet | Viola sagittata var. sagittata | VISAS5 | Violaceae | Dicot |
| arumleaf arrowhead | Sagittaria cuneata | SACU | Alismataceae | Monocot |
| aruncus | Aruncus | ARUNC | Rosaceae | Dicot |
| ash | Fraxinus | FRAXI | Oleaceae | Dicot |
| Ashe"s juniper | Juniperus ashei | JUAS | Cupressaceae | Gymnosperm |
| ashy hydrangea | Hydrangea cinerea | HYCI3 | Hydrangeaceae | Dicot |
| ashy sunflower | Helianthus mollis | HEMO2 | Asteraceae | Dicot |
| Asiatic dayflower | Commelina communis | COCO3 | Commelinaceae | Monocot |
| asparagus | Asparagus | ASPAR | Liliaceae | Monocot |
| asplenium ladyfern | Athyrium filix-femina ssp. asplenioides | ATFIA2 | Dryopteridaceae | Fern |
| aster | Ionactis | IONAC | Asteraceae | Dicot |
| aster | Eurybia | EURYB | Asteraceae | Dicot |
| aster | Symphyotrichum | SYMPH4 | Asteraceae | Dicot |
| Atlantic camas | Camassia scilloides | CASC5 | Liliaceae | Monocot |
| Atlantic goldenrod | Solidago arguta | SOAR | Asteraceae | Dicot |
| Atlantic ninebark | Physocarpus opulifolius var. intermedius | PHOPI | Rosaceae | Dicot |
| Atlantic pigeonwings | Clitoria mariana | CLMA4 | Fabaceae | Dicot |
| Atlantic poison oak | Toxicodendron pubescens | TOPU2 | Anacardiaceae | Dicot |
| Aunt Lucy | Ellisia nyctelea | ELNY | Hydrophyllaceae | Dicot |
| Australian Water-Clover | Marsilea mutica | MAMU2 | Marsileaceae | Fern |
| autumn bluegrass | Poa autumnalis | POAU | Poaceae | Monocot |
| autumn coralroot | Corallorhiza odontorhiza | COOD7 | Orchidaceae | Monocot |
| autumn coralroot | Corallorhiza odontorhiza var. odontorhiza | COODO2 | Orchidaceae | Monocot |
| autumn onion | Allium stellatum | ALST | Liliaceae | Monocot |
| avens | Geum | GEUM | Rosaceae | Dicot |
| awlfruit sedge | Carex stipata | CAST5 | Cyperaceae | Monocot |
| awned halfchaff sedge | Lipocarpha aristulata | LIAR6 | Cyperaceae | Monocot |
| axilflower | Mecardonia acuminata | MEAC | Scrophulariaceae | Dicot |
| axilflower | Mecardonia acuminata var. acuminata | MEACA | Scrophulariaceae | Dicot |
| Aztec marigold | Tagetes erecta | TAER | Asteraceae | Dicot |
| azure blue sage | Salvia azurea | SAAZ | Lamiaceae | Dicot |
| baby blue eyes | Nemophila | NEMOP | Hydrophyllaceae | Dicot |
| baby"s breath | Gypsophila paniculata | GYPA | Caryophyllaceae | Dicot |
| baby"s-breath | Gypsophila | GYPSO | Caryophyllaceae | Dicot |
| babyslippers | Hybanthus verticillatus | HYVE | Violaceae | Dicot |
| baccharis | Baccharis | BACCH | Asteraceae | Dicot |
| bagpod | Sesbania vesicaria | SEVE | Fabaceae | Dicot |
| bahia | Picradeniopsis | PICRA3 | Asteraceae | Dicot |
| bahiagrass | Paspalum notatum | PANO2 | Poaceae | Monocot |
| bahiagrass | Paspalum notatum var. notatum | PANON | Poaceae | Monocot |
| Bailey"s hedgehog cactus | Echinocereus reichenbachii ssp. baileyi | ECREB2 | Cactaceae | Dicot |
| Bailey"s rabbitbrush | Chrysothamnus baileyi | CHBA11 | Asteraceae | Dicot |
| bald brome | Bromus racemosus | BRRA2 | Poaceae | Monocot |
| bald cypress | Taxodium | TAXOD | Cupressaceae | Gymnosperm |
| bald cypress | Taxodium distichum | TADI2 | Cupressaceae | Gymnosperm |
| bald spikerush | Eleocharis erythropoda | ELER | Cyperaceae | Monocot |
| Baldwin"s flatsedge | Cyperus croceus | CYCR6 | Cyperaceae | Monocot |
| Baldwin"s ironweed | Vernonia baldwinii | VEBA | Asteraceae | Dicot |
| Baldwin"s ironweed | Vernonia baldwinii ssp. baldwinii | VEBAB | Asteraceae | Dicot |
| Baldwin"s milkvine | Matelea baldwyniana | MABA3 | Asclepiadaceae | Dicot |
| balloon vine | Cardiospermum halicacabum | CAHA13 | Sapindaceae | Dicot |
| balloonvine | Cardiospermum | CARDI2 | Sapindaceae | Dicot |
| balm | Melissa | MELIS | Lamiaceae | Dicot |
| baneberry | Actaea | ACTAE | Ranunculaceae | Dicot |
| Barbara"s buttons | Marshallia | MARSH | Asteraceae | Dicot |
| barley | Hordeum | HORDE | Poaceae | Monocot |
| barnyardgrass | Echinochloa crus-galli | ECCR | Poaceae | Monocot |
| barrens silky aster | Symphyotrichum pratense | SYPR7 | Asteraceae | Dicot |
| basil beebalm | Monarda clinopodioides | MOCL2 | Lamiaceae | Dicot |
| basketgrass | Oplismenus | OPLIS | Poaceae | Monocot |
| basketgrass | Oplismenus hirtellus | OPHI | Poaceae | Monocot |
| basketgrass | Oplismenus hirtellus ssp. setarius | OPHIS | Poaceae | Monocot |
| basswood | Tilia | TILIA | Tiliaceae | Dicot |
| bastard oak | Quercus sinuata | QUSI | Fagaceae | Dicot |
| bastard oak | Quercus sinuata var. breviloba | QUSIB | Fagaceae | Dicot |
| bastard toadflax | Comandra | COMAN | Santalaceae | Dicot |
| bastard toadflax | Comandra umbellata | COUM | Santalaceae | Dicot |
| bastard toadflax | Comandra umbellata ssp. umbellata | COUMU | Santalaceae | Dicot |
| bayberry | Morella | MOREL2 | Myricaceae | Dicot |
| beach false foxglove | Agalinis fasciculata | AGFA2 | Scrophulariaceae | Dicot |
| beaded lipfern | Cheilanthes wootonii | CHWO | Pteridaceae | Fern |
| beaked agrimony | Agrimonia rostellata | AGRO3 | Rosaceae | Dicot |
| beaked cornsalad | Valerianella radiata | VARA | Valerianaceae | Dicot |
| beaked panicgrass | Panicum anceps | PAAN | Poaceae | Monocot |
| beaked skeletonweed | Shinnersoseris | SHINN2 | Asteraceae | Dicot |
| beaked skeletonweed | Shinnersoseris rostrata | SHRO2 | Asteraceae | Dicot |
| beaked spikerush | Eleocharis rostellata | ELRO2 | Cyperaceae | Monocot |
| beakgrain | Diarrhena | DIARR | Poaceae | Monocot |
| beaksedge | Rhynchospora | RHYNC3 | Cyperaceae | Monocot |
| bean | Phaseolus | PHASE | Fabaceae | Dicot |
| beard lichen | Usnea | USNEA2 | Parmeliaceae | Lichen |
| bearded beggarticks | Bidens aristosa | BIAR | Asteraceae | Dicot |
| bearded flatsedge | Cyperus squarrosus | CYSQ | Cyperaceae | Monocot |
| bearded shorthusk | Brachyelytrum erectum | BRER2 | Poaceae | Monocot |
| bearded skeletongrass | Gymnopogon ambiguus | GYAM | Poaceae | Monocot |
| bearded sprangletop | Leptochloa fusca ssp. fascicularis | LEFUF | Poaceae | Monocot |
| beardgrass | Bothriochloa | BOTHR | Poaceae | Monocot |
| beardless rabbitsfoot grass | Polypogon viridis | POVI9 | Poaceae | Monocot |
| beardtongue | Penstemon | PENST | Scrophulariaceae | Dicot |
| beargrass | Nolina | NOLIN | Liliaceae | Monocot |
| beautyberry | Callicarpa | CALLI2 | Verbenaceae | Dicot |
| bedstraw | Galium | GALIU | Rubiaceae | Dicot |
| bedstraw | Cruciata | CRUCI2 | Rubiaceae | Dicot |
| beebalm | Monarda stipitatoglandulosa | MOST2 | Lamiaceae | Dicot |
| beebalm | Monarda | MONAR | Lamiaceae | Dicot |
| beeblossom | Gaura | GAURA | Onagraceae | Dicot |
| beech | Fagus | FAGUS | Fagaceae | Dicot |
| beechdrops | Epifagus | EPIFA | Orobanchaceae | Dicot |
| beechdrops | Epifagus virginiana | EPVI2 | Orobanchaceae | Dicot |
| beechfern | Phegopteris | PHEGO | Thelypteridaceae | Fern |
| beefsteakplant | Perilla frutescens | PEFR4 | Lamiaceae | Dicot |
| beefsteakplant | Perilla frutescens var. frutescens | PEFRF2 | Lamiaceae | Dicot |
| beggarslice | Hackelia virginiana | HAVI2 | Boraginaceae | Dicot |
| beggarticks | Bidens | BIDEN | Asteraceae | Dicot |
| belamcanda | Belamcanda | BELAM | Iridaceae | Monocot |
| bellflower | Campanulastrum | CAMPA2 | Campanulaceae | Dicot |
| bellwort | Uvularia | UVULA | Liliaceae | Monocot |
| Benjamin Franklin bush | Valerianella ozarkana | VAOZ | Valerianaceae | Dicot |
| bentawn flatsedge | Cyperus reflexus | CYRE2 | Cyperaceae | Monocot |
| bentgrass | Agrostis | AGROS2 | Poaceae | Monocot |
| bergia | Bergia | BERGI | Elatinaceae | Dicot |
| Berlandier"s sundrops | Calylophus berlandieri | CABE6 | Onagraceae | Dicot |
| Berlandier"s sundrops | Calylophus berlandieri ssp. berlandieri | CABEB2 | Onagraceae | Dicot |
| Berlandier"s sundrops | Calylophus berlandieri ssp. pinifolius | CABEP2 | Onagraceae | Dicot |
| Berlandier"s wolfberry | Lycium berlandieri | LYBE | Solanaceae | Dicot |
| Berlandier"s wolfberry | Lycium berlandieri var. berlandieri | LYBEB | Solanaceae | Dicot |
| Berlandier"s yellow flax | Linum berlandieri | LIBE2 | Linaceae | Dicot |
| Berlandier"s yellow flax | Linum berlandieri var. berlandieri | LIBEB2 | Linaceae | Dicot |
| Bermudagrass | Cynodon | CYNOD | Poaceae | Monocot |
| Bermudagrass | Cynodon dactylon | CYDA | Poaceae | Monocot |
| betonyleaf noseburn | Tragia betonicifolia | TRBE4 | Euphorbiaceae | Dicot |
| Beyrich"s fleabane | Erigeron strigosus var. beyrichii | ERSTB | Asteraceae | Dicot |
| biannual lettuce | Lactuca ludoviciana | LALU | Asteraceae | Dicot |
| Bicknell"s sedge | Carex opaca | CAOP5 | Cyperaceae | Monocot |
| big bluestem | Andropogon gerardii | ANGE | Poaceae | Monocot |
| big carpetgrass | Axonopus furcatus | AXFU | Poaceae | Monocot |
| big chickweed | Cerastium fontanum ssp. vulgare | CEFOV2 | Caryophyllaceae | Dicot |
| big devils beggartick | Bidens vulgata | BIVU | Asteraceae | Dicot |
| big sacaton | Sporobolus wrightii | SPWR2 | Poaceae | Monocot |
| bigbract verbena | Verbena bracteata | VEBR | Verbenaceae | Dicot |
| Bigelow"s beggarticks | Bidens bigelovii | BIBI | Asteraceae | Dicot |
| Bigelow"s beggarticks | Bidens bigelovii var. bigelovii | BIBIB2 | Asteraceae | Dicot |
| Bigelow"s bluegrass | Poa bigelovii | POBI | Poaceae | Monocot |
| Bigelow"s tansyaster | Machaeranthera bigelovii | MABI | Asteraceae | Dicot |
| Bigelow"s tansyaster | Machaeranthera bigelovii var. bigelovii | MABIB | Asteraceae | Dicot |
| bigfruit evening primrose | Oenothera macrocarpa | OEMA | Onagraceae | Dicot |
| bigfruit evening primrose | Oenothera macrocarpa ssp. incana | OEMAI2 | Onagraceae | Dicot |
| bigfruit evening primrose | Oenothera macrocarpa ssp. macrocarpa | OEMAM | Onagraceae | Dicot |
| bighead pygmycudweed | Evax prolifera | EVPR | Asteraceae | Dicot |
| bignonia | Bignonia | BIGNO | Bignoniaceae | Dicot |
| bigpod sesbania | Sesbania herbacea | SEHE8 | Fabaceae | Dicot |
| bigroot springparsley | Cymopterus macrorhizus | CYMA | Apiaceae | Dicot |
| bigseed alfalfa dodder | Cuscuta indecora | CUIN | Cuscutaceae | Dicot |
| bigseed alfalfa dodder | Cuscuta indecora var. indecora | CUINI | Cuscutaceae | Dicot |
| bigtop lovegrass | Eragrostis hirsuta | ERHI | Poaceae | Monocot |
| bindweed | Convolvulus | CONVO | Convolvulaceae | Dicot |
| birch | Betula | BETUL | Betulaceae | Dicot |
| bird"s-eye cress | Myagrum perfoliatum | MYPE | Brassicaceae | Dicot |
| bird"s-foot trefoil | Lotus corniculatus | LOCO6 | Fabaceae | Dicot |
| bird"s-foot trefoil | Lotus corniculatus var. corniculatus | LOCOC5 | Fabaceae | Dicot |
| bird-of-paradise shrub | Caesalpinia gilliesii | CAGI | Fabaceae | Dicot |
| birdeye speedwell | Veronica persica | VEPE3 | Scrophulariaceae | Dicot |
| birdfoot violet | Viola pedata | VIPE | Violaceae | Dicot |
| bishop | Bifora | BIFOR | Apiaceae | Dicot |
| bitter dock | Rumex obtusifolius | RUOB | Polygonaceae | Dicot |
| bitter rubberweed | Hymenoxys odorata | HYOD | Asteraceae | Dicot |
| bittercress | Cardamine | CARDA | Brassicaceae | Dicot |
| bitternut hickory | Carya cordiformis | CACO15 | Juglandaceae | Dicot |
| bittersweet | Celastrus | CELAS | Celastraceae | Dicot |
| black bindweed | Polygonum convolvulus | POCO10 | Polygonaceae | Dicot |
| black bindweed | Polygonum convolvulus var. convolvulus | POCOC2 | Polygonaceae | Dicot |
| black cherry | Prunus serotina | PRSE2 | Rosaceae | Dicot |
| black cherry | Prunus serotina var. serotina | PRSES | Rosaceae | Dicot |
| black edge sedge | Carex nigromarginata | CANI3 | Cyperaceae | Monocot |
| black elderberry | Sambucus nigra | SANI4 | Caprifoliaceae | Dicot |
| black flatsedge | Cyperus niger | CYNI2 | Cyperaceae | Monocot |
| black grama | Bouteloua eriopoda | BOER4 | Poaceae | Monocot |
| black hickory | Carya texana | CATE9 | Juglandaceae | Dicot |
| black highbush blueberry | Vaccinium fuscatum | VAFU | Ericaceae | Dicot |
| black locust | Robinia pseudoacacia | ROPS | Fabaceae | Dicot |
| black medick | Medicago lupulina | MELU | Fabaceae | Dicot |
| black mustard | Brassica nigra | BRNI | Brassicaceae | Dicot |
| black oak | Quercus velutina | QUVE | Fagaceae | Dicot |
| black prairie clover | Dalea frutescens | DAFR2 | Fabaceae | Dicot |
| black raspberry | Rubus occidentalis | RUOC | Rosaceae | Dicot |
| black walnut | Juglans nigra | JUNI | Juglandaceae | Dicot |
| black willow | Salix nigra | SANI | Salicaceae | Dicot |
| blackberry | Rubus | RUBUS | Rosaceae | Dicot |
| blackberry lily | Belamcanda chinensis | BECH | Iridaceae | Monocot |
| blackdisk medick | Medicago orbicularis | MEOR2 | Fabaceae | Dicot |
| blackeyed Susan | Rudbeckia hirta | RUHI2 | Asteraceae | Dicot |
| blackeyed Susan | Rudbeckia hirta var. pulcherrima | RUHIP | Asteraceae | Dicot |
| blackfoot | Melampodium | MELAM | Asteraceae | Dicot |
| blackfoot quillwort | Isoetes melanopoda | ISME | Isoetaceae | Quillwort |
| blackgum | Nyssa sylvatica | NYSY | Cornaceae | Dicot |
| blackhaw | Viburnum prunifolium | VIPR | Caprifoliaceae | Dicot |
| blackjack oak | Quercus marilandica | QUMA3 | Fagaceae | Dicot |
| blackjack oak | Quercus marilandica var. ashei | QUMAA2 | Fagaceae | Dicot |
| blackjack oak | Quercus marilandica var. marilandica | QUMAM2 | Fagaceae | Dicot |
| blacksamson echinacea | Echinacea angustifolia | ECAN2 | Asteraceae | Dicot |
| blacksamson echinacea | Echinacea angustifolia var. angustifolia | ECANA | Asteraceae | Dicot |
| blackseed plantain | Plantago rugelii | PLRU | Plantaginaceae | Dicot |
| blackseed plantain | Plantago rugelii var. rugelii | PLRUR | Plantaginaceae | Dicot |
| blackseed speargrass | Piptochaetium avenaceum | PIAV | Poaceae | Monocot |
| blackspot hornpoppy | Glaucium corniculatum | GLCO3 | Papaveraceae | Dicot |
| blackstem spleenwort | Asplenium resiliens | ASRE | Aspleniaceae | Fern |
| bladder senna | Colutea arborescens | COAR6 | Fabaceae | Dicot |
| bladderfern | Cystopteris | CYSTO | Dryopteridaceae | Fern |
| bladdernut | Staphylea | STAPH | Staphyleaceae | Dicot |
| bladderpod | Lesquerella | LESQU | Brassicaceae | Dicot |
| bladderwort | Utricularia | UTRIC | Lentibulariaceae | Dicot |
| blanketflower | Gaillardia | GAILL | Asteraceae | Dicot |
| blazing star | Liatris | LIATR | Asteraceae | Dicot |
| blazing star | Liatris aestivalis | LIAE3 | Asteraceae | Dicot |
| blazingstar | Mentzelia | MENTZ | Loasaceae | Dicot |
| bleeding heart | Dicentra | DICEN | Fumariaceae | Dicot |
| blessed milkthistle | Silybum marianum | SIMA3 | Asteraceae | Dicot |
| blindeyes | Papaver dubium | PADU | Papaveraceae | Dicot |
| blisterwort | Ranunculus recurvatus | RARE2 | Ranunculaceae | Dicot |
| blisterwort | Ranunculus recurvatus var. recurvatus | RARER2 | Ranunculaceae | Dicot |
| bloodleaf | Iresine | IRESI | Amaranthaceae | Dicot |
| bloodroot | Sanguinaria | SANGU | Papaveraceae | Dicot |
| bloodroot | Sanguinaria canadensis | SACA13 | Papaveraceae | Dicot |
| bloody butcher | Trillium recurvatum | TRRE5 | Liliaceae | Monocot |
| blowout grass | Redfieldia | REDFI | Poaceae | Monocot |
| blowout grass | Redfieldia flexuosa | REFL | Poaceae | Monocot |
| blue ash | Fraxinus quadrangulata | FRQU | Oleaceae | Dicot |
| blue cohosh | Caulophyllum thalictroides | CATH2 | Berberidaceae | Dicot |
| blue eyed Mary | Collinsia | COLLI | Scrophulariaceae | Dicot |
| blue fieldmadder | Sherardia arvensis | SHAR2 | Rubiaceae | Dicot |
| blue funnel lily | Androstephium coeruleum | ANCO9 | Liliaceae | Monocot |
| blue grama | Bouteloua gracilis | BOGR2 | Poaceae | Monocot |
| blue lettuce | Lactuca tatarica | LATA | Asteraceae | Dicot |
| blue lettuce | Lactuca tatarica var. pulchella | LATAP | Asteraceae | Dicot |
| blue mistflower | Conoclinium coelestinum | COCO13 | Asteraceae | Dicot |
| blue mudplantain | Heteranthera limosa | HELI2 | Pontederiaceae | Monocot |
| Blue Ridge blueberry | Vaccinium pallidum | VAPA4 | Ericaceae | Dicot |
| Blue Ridge carrionflower | Smilax lasioneura | SMLA3 | Smilacaceae | Monocot |
| blue sedge | Carex glaucodea | CAGL6 | Cyperaceae | Monocot |
| blue skullcap | Scutellaria lateriflora | SCLA2 | Lamiaceae | Dicot |
| blue skullcap | Scutellaria lateriflora var. lateriflora | SCLAL2 | Lamiaceae | Dicot |
| blue threeawn | Aristida purpurea var. nealleyi | ARPUN | Poaceae | Monocot |
| blue waxweed | Cuphea viscosissima | CUVI | Lythraceae | Dicot |
| blue wild indigo | Baptisia australis | BAAU | Fabaceae | Dicot |
| blue wild indigo | Baptisia australis var. minor | BAAUM | Fabaceae | Dicot |
| blue wildrye | Elymus glaucus | ELGL | Poaceae | Monocot |
| blue wildrye | Elymus glaucus ssp. glaucus | ELGLG | Poaceae | Monocot |
| blue-eyed grass | Sisyrinchium | SISYR | Iridaceae | Monocot |
| blueberry | Vaccinium | VACCI | Ericaceae | Dicot |
| blueberry hawthorn | Crataegus brachyacantha | CRBR | Rosaceae | Dicot |
| bluebill | Clematis pitcheri | CLPI | Ranunculaceae | Dicot |
| bluebill | Clematis pitcheri var. pitcheri | CLPIP | Ranunculaceae | Dicot |
| bluebowls | Giliastrum | GILIA2 | Polemoniaceae | Dicot |
| bluebowls | Giliastrum acerosum | GIAC4 | Polemoniaceae | Dicot |
| bluecurls | Trichostema | TRICH9 | Lamiaceae | Dicot |
| blueflower eryngo | Eryngium integrifolium | ERIN6 | Apiaceae | Dicot |
| bluegrass | Poa | POA | Poaceae | Monocot |
| bluehearts | Buchnera | BUCHN | Scrophulariaceae | Dicot |
| bluejack oak | Quercus incana | QUIN | Fagaceae | Dicot |
| bluejacket | Tradescantia ohiensis | TROH | Commelinaceae | Monocot |
| bluestar | Amsonia | AMSON | Apocynaceae | Dicot |
| bluestem | Andropogon | ANDRO2 | Poaceae | Monocot |
| bluet | Houstonia | HOUST | Rubiaceae | Dicot |
| bluethread | Burmannia | BURMA | Burmanniaceae | Monocot |
| blunt broom sedge | Carex tribuloides | CATR7 | Cyperaceae | Monocot |
| blunt broom sedge | Carex tribuloides var. tribuloides | CATRT2 | Cyperaceae | Monocot |
| blunt spikerush | Eleocharis obtusa | ELOB2 | Cyperaceae | Monocot |
| bluntleaf bedstraw | Galium obtusum | GAOB | Rubiaceae | Dicot |
| bluntleaf bedstraw | Galium obtusum ssp. obtusum | GAOBO | Rubiaceae | Dicot |
| bluntleaf yellowcress | Rorippa curvipes | ROCU2 | Brassicaceae | Dicot |
| bluntleaf yellowcress | Rorippa curvipes var. truncata | ROCUT | Brassicaceae | Dicot |
| bluntlobe cliff fern | Woodsia obtusa | WOOB2 | Dryopteridaceae | Fern |
| bluntlobe cliff fern | Woodsia obtusa ssp. obtusa | WOOBO | Dryopteridaceae | Fern |
| bog orchid | Habenaria | HABEN | Orchidaceae | Monocot |
| bog rush | Juncus biflorus | JUBI | Juncaceae | Monocot |
| bog smartweed | Polygonum setaceum | POSE6 | Polygonaceae | Dicot |
| bog white violet | Viola lanceolata | VILA4 | Violaceae | Dicot |
| bog white violet | Viola lanceolata ssp. lanceolata | VILAL | Violaceae | Dicot |
| bog white violet | Viola lanceolata ssp. vittata | VILAV | Violaceae | Dicot |
| bog willowherb | Epilobium leptophyllum | EPLE2 | Onagraceae | Dicot |
| bog yellowcress | Rorippa palustris | ROPA2 | Brassicaceae | Dicot |
| bog yelloweyed grass | Xyris difformis | XYDI | Xyridaceae | Monocot |
| bog yelloweyed grass | Xyris difformis var. difformis | XYDID | Xyridaceae | Monocot |
| bogmat | Wolffiella | WOLFF2 | Lemnaceae | Monocot |
| bonebract amaranth | Amaranthus scleropoides | AMSC | Amaranthaceae | Dicot |
| Boott"s goldenrod | Solidago arguta var. boottii | SOARB | Asteraceae | Dicot |
| Bosc"s mille graines | Oldenlandia boscii | OLBO | Rubiaceae | Dicot |
| Bosc"s panicgrass | Dichanthelium boscii | DIBO2 | Poaceae | Monocot |
| bottlebrush sedge | Carex hystericina | CAHY4 | Cyperaceae | Monocot |
| bottomland aster | Symphyotrichum ontarionis | SYON2 | Asteraceae | Dicot |
| bouncingbet | Saponaria officinalis | SAOF4 | Caryophyllaceae | Dicot |
| bouquet mudplantain | Heteranthera multiflora | HEMU5 | Pontederiaceae | Monocot |
| bowlesia | Bowlesia | BOWLE | Apiaceae | Dicot |
| box knotweed | Polygonum buxiforme | POBU2 | Polygonaceae | Dicot |
| boxelder | Acer negundo | ACNE2 | Aceraceae | Dicot |
| boxelder | Acer negundo var. interius | ACNEI2 | Aceraceae | Dicot |
| boxelder | Acer negundo var. negundo | ACNEN | Aceraceae | Dicot |
| boxelder | Acer negundo var. texanum | ACNET | Aceraceae | Dicot |
| Boykin"s clusterpea | Dioclea multiflora | DIMU | Fabaceae | Dicot |
| brackenfern | Pteridium | PTERI | Dennstaedtiaceae | Fern |
| bractless blazingstar | Mentzelia nuda | MENU | Loasaceae | Dicot |
| bractless blazingstar | Mentzelia nuda var. nuda | MENUN | Loasaceae | Dicot |
| bractless blazingstar | Mentzelia nuda var. stricta | MENUS | Loasaceae | Dicot |
| Bradley"s spleenwort | Asplenium bradleyi | ASBR2 | Aspleniaceae | Fern |
| branched bur-reed | Sparganium androcladum | SPAN | Sparganiaceae | Monocot |
| branched foldwing | Dicliptera brachiata | DIBR2 | Acanthaceae | Dicot |
| branched noseburn | Tragia ramosa | TRRA5 | Euphorbiaceae | Dicot |
| Brand"s phacelia | Phacelia gilioides | PHGI | Hydrophyllaceae | Dicot |
| brasenia | Brasenia | BRASE | Cabombaceae | Dicot |
| Brazilian vervain | Verbena brasiliensis | VEBR2 | Verbenaceae | Dicot |
| Brazilian watermeal | Wolffia brasiliensis | WOBR | Lemnaceae | Monocot |
| Brazilian waterweed | Egeria densa | EGDE | Hydrocharitaceae | Monocot |
| brazosmint | Warnockia | WARNO | Lamiaceae | Dicot |
| brickellbush | Brickellia | BRICK | Asteraceae | Dicot |
| bride"s feathers | Aruncus dioicus | ARDI8 | Rosaceae | Dicot |
| bride"s feathers | Aruncus dioicus var. dioicus | ARDID2 | Rosaceae | Dicot |
| bride"s feathers | Aruncus dioicus var. pubescens | ARDIP | Rosaceae | Dicot |
| bristlegrass | Setaria | SETAR | Poaceae | Monocot |
| bristlemallow | Modiola | MODIO | Malvaceae | Dicot |
| bristly buttercup | Ranunculus hispidus | RAHI | Ranunculaceae | Dicot |
| bristly buttercup | Ranunculus hispidus var. hispidus | RAHIH | Ranunculaceae | Dicot |
| bristly buttercup | Ranunculus hispidus var. nitidus | RAHIN | Ranunculaceae | Dicot |
| bristly dogstail grass | Cynosurus echinatus | CYEC | Poaceae | Monocot |
| bristly greenbrier | Smilax tamnoides | SMTA2 | Smilacaceae | Monocot |
| bristly locust | Robinia hispida | ROHI | Fabaceae | Dicot |
| bristly locust | Robinia hispida var. hispida | ROHIH | Fabaceae | Dicot |
| bristly nama | Nama hispidum | NAHI | Hydrophyllaceae | Dicot |
| bristly scaleseed | Spermolepis echinata | SPEC2 | Apiaceae | Dicot |
| bristly wolfstail | Lycurus setosus | LYSE3 | Poaceae | Monocot |
| bristlystalked sedge | Carex leptalea | CALE10 | Cyperaceae | Monocot |
| bristlystalked sedge | Carex leptalea ssp. leptalea | CALEL4 | Cyperaceae | Monocot |
| brittle pricklypear | Opuntia fragilis | OPFR | Cactaceae | Dicot |
| brittle waternymph | Najas minor | NAMI | Najadaceae | Monocot |
| Britton"s sedge | Carex tetrastachya | CATE29 | Cyperaceae | Monocot |
| broad beechfern | Phegopteris hexagonoptera | PHHE11 | Thelypteridaceae | Fern |
| broad looseflower sedge | Carex laxiflora | CALA19 | Cyperaceae | Monocot |
| broad looseflower sedge | Carex laxiflora var. laxiflora | CALAL5 | Cyperaceae | Monocot |
| broadbeard beardtongue | Penstemon angustifolius | PEAN4 | Scrophulariaceae | Dicot |
| broadbeard beardtongue | Penstemon angustifolius var. caudatus | PEANC | Scrophulariaceae | Dicot |
| broadfruit bur-reed | Sparganium eurycarpum | SPEU | Sparganiaceae | Monocot |
| broadleaf arrowhead | Sagittaria latifolia | SALA2 | Alismataceae | Monocot |
| broadleaf cattail | Typha latifolia | TYLA | Typhaceae | Monocot |
| broadleaf enchanter"s nightshade | Circaea lutetiana | CILU | Onagraceae | Dicot |
| broadleaf enchanter"s nightshade | Circaea lutetiana ssp. canadensis | CILUC | Onagraceae | Dicot |
| broadleaf milkweed | Asclepias latifolia | ASLA4 | Asclepiadaceae | Dicot |
| broadleaf rosette grass | Dichanthelium latifolium | DILA8 | Poaceae | Monocot |
| broadleaf signalgrass | Urochloa platyphylla | URPL2 | Poaceae | Monocot |
| broadleaf wild leek | Allium ampeloprasum | ALAM | Liliaceae | Monocot |
| broadpod draba | Draba platycarpa | DRPL | Brassicaceae | Dicot |
| brome | Bromus | BROMU | Poaceae | Monocot |
| brome fescue | Vulpia bromoides | VUBR | Poaceae | Monocot |
| brook cinquefoil | Potentilla rivalis | PORI3 | Rosaceae | Dicot |
| brookweed | Samolus | SAMOL | Primulaceae | Dicot |
| broom sedge | Carex scoparia | CASC11 | Cyperaceae | Monocot |
| broom sedge | Carex scoparia var. scoparia | CASCS | Cyperaceae | Monocot |
| broom snakeweed | Gutierrezia sarothrae | GUSA2 | Asteraceae | Dicot |
| broomrape | Orobanche | OROBA | Orobanchaceae | Dicot |
| broomsedge bluestem | Andropogon virginicus | ANVI2 | Poaceae | Monocot |
| broomsedge bluestem | Andropogon virginicus var. virginicus | ANVIV | Poaceae | Monocot |
| broomweed | Amphiachyris | AMPHI8 | Asteraceae | Dicot |
| broussonetia | Broussonetia | BROUS | Moraceae | Dicot |
| brown mustard | Brassica juncea | BRJU | Brassicaceae | Dicot |
| brown widelip orchid | Liparis liliifolia | LILI3 | Orchidaceae | Monocot |
| browneyed Susan | Rudbeckia triloba | RUTR2 | Asteraceae | Dicot |
| browneyed Susan | Rudbeckia triloba var. triloba | RUTRT | Asteraceae | Dicot |
| brownish beaksedge | Rhynchospora capitellata | RHCA12 | Cyperaceae | Monocot |
| brownish sedge | Carex brunnescens | CABR15 | Cyperaceae | Monocot |
| brownish sedge | Carex brunnescens ssp. sphaerostachya | CABRS | Cyperaceae | Monocot |
| brownplume wirelettuce | Stephanomeria pauciflora | STPA4 | Asteraceae | Dicot |
| browntop signalgrass | Urochloa fusca | URFU2 | Poaceae | Monocot |
| buckeye | Aesculus | AESCU | Hippocastanaceae | Dicot |
| buckeye | Aesculus ×bushii | AEBU | Hippocastanaceae | Dicot |
| Buckley"s beardtongue | Penstemon buckleyi | PEBU | Scrophulariaceae | Dicot |
| buckthorn | Rhamnus | RHAMN | Rhamnaceae | Dicot |
| buckthorn | Frangula | FRANG | Rhamnaceae | Dicot |
| buckwheat | Fagopyrum | FAGOP2 | Polygonaceae | Dicot |
| buckwheat | Fagopyrum esculentum | FAES2 | Polygonaceae | Dicot |
| buckwheat | Eriogonum | ERIOG | Polygonaceae | Dicot |
| buckwheat vine | Brunnichia | BRUNN | Polygonaceae | Dicot |
| buffalo clover | Trifolium reflexum | TRRE2 | Fabaceae | Dicot |
| buffalobur nightshade | Solanum rostratum | SORO | Solanaceae | Dicot |
| buffalograss | Bouteloua dactyloides | BODA2 | Poaceae | Monocot |
| buffelgrass | Pennisetum ciliare | PECI | Poaceae | Monocot |
| buffpetal | Rhynchosida physocalyx | RHPH2 | Malvaceae | Dicot |
| buglossoides | Buglossoides | BUGLO | Boraginaceae | Dicot |
| bugseed | Corispermum | CORIS | Chenopodiaceae | Dicot |
| bulblet bladderfern | Cystopteris bulbifera | CYBU3 | Dryopteridaceae | Fern |
| bulbous adderstongue | Ophioglossum crotalophoroides | OPCR | Ophioglossaceae | Fern |
| bulbous adderstongue | Ophioglossum crotalophoroides var. crotalophoroides | OPCRC | Ophioglossaceae | Fern |
| bulbous bittercress | Cardamine bulbosa | CABU3 | Brassicaceae | Dicot |
| bulbous bluegrass | Poa bulbosa | POBU | Poaceae | Monocot |
| bulbous woodrush | Luzula bulbosa | LUBU | Juncaceae | Monocot |
| bull thistle | Cirsium vulgare | CIVU | Asteraceae | Dicot |
| bulltongue arrowhead | Sagittaria lancifolia | SALA | Alismataceae | Monocot |
| bulltongue arrowhead | Sagittaria lancifolia ssp. media | SALAM2 | Alismataceae | Monocot |
| bully | Sideroxylon | SIDER2 | Sapotaceae | Dicot |
| bulrush | Scirpus | SCIRP | Cyperaceae | Monocot |
| bulrush | Schoenoplectiella | SCHOE7 | Cyperaceae | Monocot |
| bulrush | Schoenoplectus | SCHOE6 | Cyperaceae | Monocot |
| bulrush | Schoenoplectus ×oblongus | SCOB10 | Cyperaceae | Monocot |
| bulrush | Isolepis | ISOLE | Cyperaceae | Monocot |
| bundleflower | Desmanthus | DESMA | Fabaceae | Dicot |
| bur chervil | Anthriscus caucalis | ANCA14 | Apiaceae | Dicot |
| bur cucumber | Sicyos | SICYO | Cucurbitaceae | Dicot |
| bur oak | Quercus macrocarpa | QUMA2 | Fagaceae | Dicot |
| bur oak | Quercus macrocarpa var. macrocarpa | QUMAM | Fagaceae | Dicot |
| bur-reed | Sparganium | SPARG | Sparganiaceae | Monocot |
| burclover | Medicago polymorpha | MEPO3 | Fabaceae | Dicot |
| burdock | Arctium | ARCTI | Asteraceae | Dicot |
| burhead | Echinodorus | ECHIN6 | Alismataceae | Monocot |
| burnet | Sanguisorba | SANGU2 | Rosaceae | Dicot |
| burningbush | Euonymus atropurpureus | EUAT5 | Celastraceae | Dicot |
| burningbush | Bassia scoparia | BASC5 | Chenopodiaceae | Dicot |
| burnweed | Erechtites | ERECH | Asteraceae | Dicot |
| burrograss | Scleropogon | SCLER7 | Poaceae | Monocot |
| burrograss | Scleropogon brevifolius | SCBR2 | Poaceae | Monocot |
| burrweed | Soliva | SOLIV | Asteraceae | Dicot |
| bursting-heart | Euonymus americanus | EUAM9 | Celastraceae | Dicot |
| bush morning-glory | Ipomoea leptophylla | IPLE | Convolvulaceae | Dicot |
| bush muhly | Muhlenbergia porteri | MUPO2 | Poaceae | Monocot |
| bush vetchling | Lathyrus eucosmus | LAEU | Fabaceae | Dicot |
| Bush"s blackberry | Rubus bushii | RUBU2 | Rosaceae | Dicot |
| Bush"s poppymallow | Callirhoe bushii | CABU8 | Malvaceae | Dicot |
| Bush"s purple coneflower | Echinacea paradoxa | ECPA2 | Asteraceae | Dicot |
| Bush"s purple coneflower | Echinacea paradoxa var. neglecta | ECPAN | Asteraceae | Dicot |
| Bush"s sedge | Carex bushii | CABU5 | Cyperaceae | Monocot |
| Bush"s umbrella-sedge | Fuirena bushii | FUBU | Cyperaceae | Monocot |
| bushclover dodder | Cuscuta pentagona var. glabrior | CUPEG | Cuscutaceae | Dicot |
| bushclover dodder | Cuscuta pentagona var. pubescens | CUPEP3 | Cuscutaceae | Dicot |
| bushy bluestem | Andropogon glomeratus | ANGL2 | Poaceae | Monocot |
| bushy bluestem | Andropogon glomeratus var. hirsutior | ANGLH | Poaceae | Monocot |
| bushy bluestem | Andropogon glomeratus var. pumilus | ANGLP | Poaceae | Monocot |
| bushy goldentop | Euthamia leptocephala | EULE4 | Asteraceae | Dicot |
| bushy knotweed | Polygonum ramosissimum | PORA3 | Polygonaceae | Dicot |
| bushy knotweed | Polygonum ramosissimum var. prolificum | PORAP | Polygonaceae | Dicot |
| bushy knotweed | Polygonum ramosissimum var. ramosissimum | PORAR | Polygonaceae | Dicot |
| bushy St. Johnswort | Hypericum densiflorum | HYDE | Clusiaceae | Dicot |
| Butler"s sandparsley | Ammoselinum butleri | AMBU | Apiaceae | Dicot |
| butter and eggs | Linaria vulgaris | LIVU2 | Scrophulariaceae | Dicot |
| buttercup | Ranunculus | RANUN | Ranunculaceae | Dicot |
| butterfly milkweed | Asclepias tuberosa | ASTU | Asclepiadaceae | Dicot |
| butterfly milkweed | Asclepias tuberosa ssp. interior | ASTUI | Asclepiadaceae | Dicot |
| butterfly pea | Centrosema | CENTR2 | Fabaceae | Dicot |
| butterweed | Packera glabella | PAGL17 | Asteraceae | Dicot |
| butterwort | Pinguicula | PINGU | Lentibulariaceae | Dicot |
| button eryngo | Eryngium yuccifolium | ERYU | Apiaceae | Dicot |
| button eryngo | Eryngium yuccifolium var. synchaetum | ERYUS | Apiaceae | Dicot |
| buttonbush | Cephalanthus | CEPHA | Rubiaceae | Dicot |
| buttonbush dodder | Cuscuta cephalanthi | CUCE | Cuscutaceae | Dicot |
| buttonweed | Diodia | DIODI | Rubiaceae | Dicot |
| cactus apple | Opuntia engelmannii | OPEN3 | Cactaceae | Dicot |
| calamus | Acorus calamus | ACCA4 | Acoraceae | Monocot |
| calcareous cryptantha | Cryptantha thyrsiflora | CRTH | Boraginaceae | Dicot |
| Caley pea | Lathyrus hirsutus | LAHI2 | Fabaceae | Dicot |
| calico aster | Symphyotrichum lateriflorum | SYLA4 | Asteraceae | Dicot |
| calico aster | Symphyotrichum lateriflorum var. flagellare | SYLAF | Asteraceae | Dicot |
| calico aster | Symphyotrichum lateriflorum var. lateriflorum | SYLAL7 | Asteraceae | Dicot |
| California brickellbush | Brickellia californica | BRCA3 | Asteraceae | Dicot |
| California brickellbush | Brickellia californica var. californica | BRCAC | Asteraceae | Dicot |
| California bulrush | Schoenoplectus californicus | SCCA11 | Cyperaceae | Monocot |
| California loosestrife | Lythrum californicum | LYCA4 | Lythraceae | Dicot |
| California nettle | Urtica dioica ssp. gracilis | URDIG | Urticaceae | Dicot |
| Callery pear | Pyrus calleryana | PYCA80 | Rosaceae | Dicot |
| caltrop | Kallstroemia | KALLS | Zygophyllaceae | Dicot |
| calycocarpum | Calycocarpum | CALYC2 | Menispermaceae | Dicot |
| calyptocarpus | Calyptocarpus | CALYP2 | Asteraceae | Dicot |
| camas | Camassia | CAMAS | Liliaceae | Monocot |
| camphor pluchea | Pluchea camphorata | PLCA7 | Asteraceae | Dicot |
| camphorweed | Pluchea | PLUCH | Asteraceae | Dicot |
| camphorweed | Heterotheca subaxillaris | HESU3 | Asteraceae | Dicot |
| campsis | Campsis | CAMPS | Bignoniaceae | Dicot |
| Canada bluegrass | Poa compressa | POCO | Poaceae | Monocot |
| Canada cocklebur | Xanthium strumarium var. canadense | XASTC | Asteraceae | Dicot |
| Canada germander | Teucrium canadense | TECA3 | Lamiaceae | Dicot |
| Canada germander | Teucrium canadense var. canadense | TECAC | Lamiaceae | Dicot |
| Canada goldenrod | Solidago canadensis | SOCA6 | Asteraceae | Dicot |
| Canada goldenrod | Solidago altissima | SOAL6 | Asteraceae | Dicot |
| Canada lettuce | Lactuca canadensis | LACA | Asteraceae | Dicot |
| Canada spikesedge | Eleocharis geniculata | ELGE | Cyperaceae | Monocot |
| Canada toadflax | Nuttallanthus canadensis | NUCA | Scrophulariaceae | Dicot |
| Canada wildrye | Elymus canadensis | ELCA4 | Poaceae | Monocot |
| Canadian blacksnakeroot | Sanicula canadensis | SACA15 | Apiaceae | Dicot |
| Canadian blacksnakeroot | Sanicula canadensis var. canadensis | SACAC2 | Apiaceae | Dicot |
| Canadian clearweed | Pilea pumila var. pumila | PIPUP | Urticaceae | Dicot |
| Canadian clearweed | Pilea pumila | PIPU2 | Urticaceae | Dicot |
| Canadian honewort | Cryptotaenia canadensis | CRCA9 | Apiaceae | Dicot |
| Canadian horseweed | Conyza canadensis | COCA5 | Asteraceae | Dicot |
| Canadian horseweed | Conyza canadensis var. canadensis | COCAC3 | Asteraceae | Dicot |
| Canadian horseweed | Conyza canadensis var. glabrata | COCAG | Asteraceae | Dicot |
| Canadian horseweed | Conyza canadensis var. pusilla | COCAP3 | Asteraceae | Dicot |
| Canadian lousewort | Pedicularis canadensis | PECA | Scrophulariaceae | Dicot |
| Canadian lousewort | Pedicularis canadensis ssp. canadensis | PECAC3 | Scrophulariaceae | Dicot |
| Canadian milkvetch | Astragalus canadensis | ASCA11 | Fabaceae | Dicot |
| Canadian milkvetch | Astragalus canadensis var. canadensis | ASCAC6 | Fabaceae | Dicot |
| Canadian waterweed | Elodea canadensis | ELCA7 | Hydrocharitaceae | Monocot |
| Canadian wildginger | Asarum canadense | ASCA | Aristolochiaceae | Dicot |
| Canadian woodnettle | Laportea canadensis | LACA3 | Urticaceae | Dicot |
| canaigre dock | Rumex hymenosepalus | RUHY | Polygonaceae | Dicot |
| canary violet | Viola ×primulifolia | VIPR4 | Violaceae | Dicot |
| canarygrass | Phalaris | PHALA2 | Poaceae | Monocot |
| cancerwort | Kickxia | KICKX | Scrophulariaceae | Dicot |
| candle cholla | Cylindropuntia kleiniae | CYKL | Cactaceae | Dicot |
| cane | Arundinaria | ARUND2 | Poaceae | Monocot |
| cane bluestem | Bothriochloa barbinodis | BOBA3 | Poaceae | Monocot |
| cantaloupe | Cucumis melo | CUME | Cucurbitaceae | Dicot |
| capillary hairsedge | Bulbostylis ciliatifolia | BUCI | Cyperaceae | Monocot |
| capillary hairsedge | Bulbostylis ciliatifolia var. ciliatifolia | BUCIC2 | Cyperaceae | Monocot |
| capsella | Capsella | CAPSE | Brassicaceae | Dicot |
| cardinalflower | Lobelia cardinalis | LOCA2 | Campanulaceae | Dicot |
| carelessweed | Amaranthus palmeri | AMPA | Amaranthaceae | Dicot |
| carelessweed | Cyclachaena | CYCLA4 | Asteraceae | Dicot |
| Carelessweed | Cyclachaena xanthiifolia | CYXA2 | Asteraceae | Dicot |
| Carolina anemone | Anemone caroliniana | ANCA9 | Ranunculaceae | Dicot |
| Carolina basswood | Tilia americana var. caroliniana | TIAMC | Tiliaceae | Dicot |
| Carolina bristlemallow | Modiola caroliniana | MOCA | Malvaceae | Dicot |
| Carolina buckthorn | Frangula caroliniana | FRCA13 | Rhamnaceae | Dicot |
| Carolina canarygrass | Phalaris caroliniana | PHCA6 | Poaceae | Monocot |
| Carolina clover | Trifolium carolinianum | TRCA6 | Fabaceae | Dicot |
| Carolina coralbead | Cocculus carolinus | COCA | Menispermaceae | Dicot |
| Carolina crabgrass | Digitaria pubiflora | DIPU9 | Poaceae | Monocot |
| Carolina crownbeard | Verbesina walteri | VEWA | Asteraceae | Dicot |
| Carolina desert-chicory | Pyrrhopappus carolinianus | PYCA2 | Asteraceae | Dicot |
| Carolina draba | Draba reptans | DRRE2 | Brassicaceae | Dicot |
| Carolina elephantsfoot | Elephantopus carolinianus | ELCA3 | Asteraceae | Dicot |
| Carolina fanwort | Cabomba caroliniana | CACA | Cabombaceae | Dicot |
| Carolina fanwort | Cabomba caroliniana var. caroliniana | CACAC4 | Cabombaceae | Dicot |
| Carolina foxtail | Alopecurus carolinianus | ALCA4 | Poaceae | Monocot |
| Carolina geranium | Geranium carolinianum | GECA5 | Geraniaceae | Dicot |
| Carolina geranium | Geranium carolinianum var. carolinianum | GECAC4 | Geraniaceae | Dicot |
| Carolina holly | Ilex ambigua | ILAM | Aquifoliaceae | Dicot |
| Carolina horsenettle | Solanum carolinense | SOCA3 | Solanaceae | Dicot |
| Carolina horsenettle | Solanum carolinense var. carolinense | SOCAC4 | Solanaceae | Dicot |
| Carolina larkspur | Delphinium carolinianum | DECA3 | Ranunculaceae | Dicot |
| Carolina larkspur | Delphinium carolinianum ssp. carolinianum | DECAC3 | Ranunculaceae | Dicot |
| Carolina larkspur | Delphinium carolinianum ssp. vimineum | DECAV | Ranunculaceae | Dicot |
| Carolina larkspur | Delphinium carolinianum ssp. virescens | DECAV2 | Ranunculaceae | Dicot |
| Carolina leaf-flower | Phyllanthus caroliniensis | PHCA9 | Euphorbiaceae | Dicot |
| Carolina leaf-flower | Phyllanthus caroliniensis ssp. caroliniensis | PHCAC | Euphorbiaceae | Dicot |
| Carolina mosquitofern | Azolla caroliniana | AZCA | Azollaceae | Fern |
| Carolina nutrush | Scleria pauciflora var. caroliniana | SCPAC | Cyperaceae | Monocot |
| Carolina ponysfoot | Dichondra carolinensis | DICA3 | Convolvulaceae | Dicot |
| Carolina poplar | Populus ×canadensis | POCA19 | Salicaceae | Dicot |
| Carolina puccoon | Lithospermum caroliniense | LICA13 | Boraginaceae | Dicot |
| Carolina puccoon | Lithospermum caroliniense var. caroliniense | LICAC8 | Boraginaceae | Dicot |
| Carolina puccoon | Lithospermum caroliniense var. croceum | LICAC9 | Boraginaceae | Dicot |
| Carolina rose | Rosa carolina | ROCA4 | Rosaceae | Dicot |
| Carolina rose | Rosa carolina var. carolina | ROCAC | Rosaceae | Dicot |
| Carolina sedge | Carex caroliniana | CACA15 | Cyperaceae | Monocot |
| Carolina vetch | Vicia caroliniana | VICA2 | Fabaceae | Dicot |
| Carolina violet | Viola villosa | VIVI3 | Violaceae | Dicot |
| Carolina wild petunia | Ruellia caroliniensis | RUCA4 | Acanthaceae | Dicot |
| Carolina wild petunia | Ruellia caroliniensis ssp. caroliniensis | RUCAC2 | Acanthaceae | Dicot |
| Carolina wild petunia | Ruellia caroliniensis ssp. caroliniensis var. caroliniensis | RUCAC4 | Acanthaceae | Dicot |
| Carolina woollywhite | Hymenopappus scabiosaeus | HYSC | Asteraceae | Dicot |
| Carolina woollywhite | Hymenopappus scabiosaeus var. corymbosus | HYSCC | Asteraceae | Dicot |
| Carolina woollywhite | Hymenopappus scabiosaeus var. scabiosaeus | HYSCS | Asteraceae | Dicot |
| carpenter"s square | Scrophularia marilandica | SCMA2 | Scrophulariaceae | Dicot |
| carpetgrass | Axonopus | AXONO | Poaceae | Monocot |
| carpetweed | Mollugo | MOLLU | Molluginaceae | Dicot |
| carpgrass | Arthraxon | ARTHR | Poaceae | Monocot |
| Carruth"s sagewort | Artemisia carruthii | ARCA14 | Asteraceae | Dicot |
| cat greenbrier | Smilax glauca | SMGL | Smilacaceae | Monocot |
| catalpa | Catalpa | CATAL | Bignoniaceae | Dicot |
| catbird grape | Vitis palmata | VIPA7 | Vitaceae | Dicot |
| catchfly | Silene | SILEN | Caryophyllaceae | Dicot |
| catchfly grass | Leersia lenticularis | LELE2 | Poaceae | Monocot |
| catchfly prairie gentian | Eustoma exaltatum | EUEX5 | Gentianaceae | Dicot |
| caterpillars | Phacelia congesta | PHCO2 | Hydrophyllaceae | Dicot |
| catnip | Nepeta | NEPET | Lamiaceae | Dicot |
| catnip | Nepeta cataria | NECA2 | Lamiaceae | Dicot |
| cattail | Typha | TYPHA | Typhaceae | Monocot |
| cattail sedge | Carex typhina | CATY | Cyperaceae | Monocot |
| Caucasian bluestem | Bothriochloa bladhii | BOBL | Poaceae | Monocot |
| ceanothus | Ceanothus | CEANO | Rhamnaceae | Dicot |
| cedar elm | Ulmus crassifolia | ULCR | Ulmaceae | Dicot |
| cedar sedge | Carex planostachys | CAPL3 | Cyperaceae | Monocot |
| celery | Apium | APIUM | Apiaceae | Dicot |
| centaury | Centaurium | CENTA2 | Gentianaceae | Dicot |
| chaffweed | Anagallis minima | ANMI4 | Primulaceae | Dicot |
| chainfern | Woodwardia | WOODW | Blechnaceae | Fern |
| chairmaker"s bulrush | Schoenoplectus americanus | SCAM6 | Cyperaceae | Monocot |
| Chalk Hill hymenopappus | Hymenopappus tenuifolius | HYTE2 | Asteraceae | Dicot |
| chalk maple | Acer leucoderme | ACLE | Aceraceae | Dicot |
| Chamisso arnica | Arnica chamissonis | ARCH3 | Asteraceae | Dicot |
| Chamisso arnica | Arnica chamissonis ssp. foliosa | ARCHF | Asteraceae | Dicot |
| Chamisso arnica | Arnica chamissonis ssp. foliosa var. andina | ARCHA2 | Asteraceae | Dicot |
| chamomile | Anthemis | ANTHE | Asteraceae | Dicot |
| Chapman"s bluegrass | Poa chapmaniana | POCH2 | Poaceae | Monocot |
| Chapman"s tridens | Tridens flavus var. chapmanii | TRFLC | Poaceae | Monocot |
| charlock mustard | Sinapis arvensis | SIAR4 | Brassicaceae | Dicot |
| chastetree | Vitex | VITEX | Verbenaceae | Dicot |
| cheatgrass | Bromus tectorum | BRTE | Poaceae | Monocot |
| cheerful sunflower | Helianthus ×laetiflorus | HELA | Asteraceae | Dicot |
| Cherokee sedge | Carex cherokeensis | CACH3 | Cyperaceae | Monocot |
| cherrybark oak | Quercus pagoda | QUPA5 | Fagaceae | Dicot |
| chervil | Chaerophyllum | CHAER | Apiaceae | Dicot |
| chervil | Anthriscus | ANTHR | Apiaceae | Dicot |
| chestnut | Castanea | CASTA | Fagaceae | Dicot |
| Chickasaw plum | Prunus angustifolia | PRAN3 | Rosaceae | Dicot |
| Chickasaw plum | Prunus angustifolia var. angustifolia | PRANA | Rosaceae | Dicot |
| chickenspike | Sphenoclea zeylanica | SPZE | Sphenocleaceae | Dicot |
| chickenthief | Mentzelia oligosperma | MEOL | Loasaceae | Dicot |
| chicory | Cichorium | CICHO | Asteraceae | Dicot |
| chicory | Cichorium intybus | CIIN | Asteraceae | Dicot |
| childing pink | Petrorhagia prolifera | PEPR4 | Caryophyllaceae | Dicot |
| Chinaberrytree | Melia azedarach | MEAZ | Meliaceae | Dicot |
| chinchweed | Pectis | PECTI | Asteraceae | Dicot |
| Chinese chastetree | Vitex negundo | VINE2 | Verbenaceae | Dicot |
| Chinese chastetree | Vitex negundo var. heterophylla | VINEH | Verbenaceae | Dicot |
| Chinese chastetree | Vitex negundo var. negundo | VINEN | Verbenaceae | Dicot |
| Chinese desert-thorn | Lycium chinense | LYCH | Solanaceae | Dicot |
| Chinese elm | Ulmus parvifolia | ULPA | Ulmaceae | Dicot |
| Chinese hound"s tongue | Cynoglossum amabile | CYAM3 | Boraginaceae | Dicot |
| Chinese lantern | Quincula lobata | QULO2 | Solanaceae | Dicot |
| Chinese privet | Ligustrum sinense | LISI | Oleaceae | Dicot |
| Chinese thorn-apple | Datura quercifolia | DAQU | Solanaceae | Dicot |
| Chinese yam | Dioscorea oppositifolia | DIOP | Dioscoreaceae | Monocot |
| chinkapin | Castanea pumila | CAPU9 | Fagaceae | Dicot |
| chinkapin | Castanea pumila var. pumila | CAPUP3 | Fagaceae | Dicot |
| chinkapin oak | Quercus muehlenbergii | QUMU | Fagaceae | Dicot |
| chloracantha | Chloracantha | CHLOR6 | Asteraceae | Dicot |
| chokeberry | Photinia | PHOTI | Rosaceae | Dicot |
| chokecherry | Prunus virginiana | PRVI | Rosaceae | Dicot |
| chokecherry | Prunus virginiana var. virginiana | PRVIV | Rosaceae | Dicot |
| cholla | Cylindropuntia | CYLIN2 | Cactaceae | Dicot |
| chorispora | Chorispora | CHORI | Brassicaceae | Dicot |
| Christmas cactus | Cylindropuntia leptocaulis | CYLE8 | Cactaceae | Dicot |
| Christmas fern | Polystichum acrostichoides | POAC4 | Dryopteridaceae | Fern |
| Christmas fern | Polystichum acrostichoides var. acrostichoides | POACA | Dryopteridaceae | Fern |
| Christmas mistletoe | Phoradendron tomentosum | PHTO2 | Viscaceae | Dicot |
| Church"s wildrye | Elymus churchii | ELCH5 | Poaceae | Monocot |
| churchmouse threeawn | Aristida dichotoma | ARDI4 | Poaceae | Monocot |
| churchmouse threeawn | Aristida dichotoma var. dichotoma | ARDID | Poaceae | Monocot |
| cinnamon fern | Osmunda cinnamomea | OSCI | Osmundaceae | Fern |
| cinnamon fern | Osmunda cinnamomea var. cinnamomea | OSCIC | Osmundaceae | Fern |
| cinquefoil | Potentilla | POTEN | Rosaceae | Dicot |
| clammy goosefoot | Dysphania pumilio | DYPU | Chenopodiaceae | Dicot |
| clammy groundcherry | Physalis heterophylla | PHHE5 | Solanaceae | Dicot |
| clammy groundcherry | Physalis heterophylla var. heterophylla | PHHEH3 | Solanaceae | Dicot |
| clammy hedgehyssop | Gratiola neglecta | GRNE | Scrophulariaceae | Dicot |
| clammyweed | Polanisia | POLAN | Capparaceae | Dicot |
| clapweed | Ephedra antisyphilitica | EPAN | Ephedraceae | Gymnosperm |
| clasping coneflower | Dracopis amplexicaulis | DRAM | Asteraceae | Dicot |
| clasping jewelflower | Streptanthus maculatus | STMA2 | Brassicaceae | Dicot |
| clasping jewelflower | Streptanthus maculatus ssp. maculatus | STMAM | Brassicaceae | Dicot |
| clasping milkweed | Asclepias amplexicaulis | ASAM | Asclepiadaceae | Dicot |
| clasping pepperweed | Lepidium perfoliatum | LEPE2 | Brassicaceae | Dicot |
| clasping Venus" looking-glass | Triodanis perfoliata | TRPE4 | Campanulaceae | Dicot |
| claspleaf pennycress | Microthlaspi perfoliatum | MIPE8 | Brassicaceae | Dicot |
| clearweed | Pilea | PILEA | Urticaceae | Dicot |
| cliff fern | Woodsia | WOODS | Dryopteridaceae | Fern |
| cliffbrake | Pellaea | PELLA | Pteridaceae | Fern |
| climbing dayflower | Commelina diffusa | CODI5 | Commelinaceae | Monocot |
| climbing dayflower | Commelina diffusa var. diffusa | CODID3 | Commelinaceae | Monocot |
| climbing dogbane | Trachelospermum difforme | TRDI | Apocynaceae | Dicot |
| climbing false buckwheat | Polygonum scandens | POSC3 | Polygonaceae | Dicot |
| climbing false buckwheat | Polygonum scandens var. scandens | POSCS | Polygonaceae | Dicot |
| climbing hempvine | Mikania scandens | MISC | Asteraceae | Dicot |
| climbing nightshade | Solanum dulcamara | SODU | Solanaceae | Dicot |
| climbing nightshade | Solanum dulcamara var. dulcamara | SODUD | Solanaceae | Dicot |
| climbing rose | Rosa setigera | ROSE2 | Rosaceae | Dicot |
| climbing rose | Rosa setigera var. setigera | ROSES | Rosaceae | Dicot |
| climbing rose | Rosa setigera var. tomentosa | ROSET | Rosaceae | Dicot |
| clinopodium | Clinopodium | CLINO | Lamiaceae | Dicot |
| cloak fern | Notholaena | NOTHO | Pteridaceae | Fern |
| cloaked bulrush | Scirpus pallidus | SCPA8 | Cyperaceae | Monocot |
| cloakfern | Astrolepis | ASTRO | Pteridaceae | Fern |
| clover | Trifolium | TRIFO | Fabaceae | Dicot |
| clubmoss | Lycopodiella | LYCOP6 | Lycopodiaceae | Lycopod |
| clustered beaksedge | Rhynchospora glomerata | RHGL3 | Cyperaceae | Monocot |
| clustered blacksnakeroot | Sanicula odorata | SAOD | Apiaceae | Dicot |
| clustered broomrape | Orobanche fasciculata | ORFA | Orobanchaceae | Dicot |
| clustered dock | Rumex conglomeratus | RUCO2 | Polygonaceae | Dicot |
| clustered fescue | Festuca paradoxa | FEPA2 | Poaceae | Monocot |
| clustered field sedge | Carex praegracilis | CAPR5 | Cyperaceae | Monocot |
| clustered mille graines | Oldenlandia uniflora | OLUN | Rubiaceae | Dicot |
| clustervine | Jacquemontia | JACQU | Convolvulaceae | Dicot |
| cnidoscolus | Cnidoscolus | CNIDO | Euphorbiaceae | Dicot |
| coast cockspur grass | Echinochloa walteri | ECWA | Poaceae | Monocot |
| coastal indigo | Indigofera miniata | INMI | Fabaceae | Dicot |
| coastal lovegrass | Eragrostis refracta | ERRE | Poaceae | Monocot |
| coastal plain panicgrass | Dichanthelium longiligulatum | DILO4 | Poaceae | Monocot |
| coastal plain sedge | Carex crebriflora | CACR5 | Cyperaceae | Monocot |
| coastal plain willow | Salix caroliniana | SACA5 | Salicaceae | Dicot |
| coastal sandbur | Cenchrus spinifex | CESP4 | Poaceae | Monocot |
| cobaea beardtongue | Penstemon cobaea | PECO4 | Scrophulariaceae | Dicot |
| cocklebur | Xanthium | XANTH2 | Asteraceae | Dicot |
| cockspur grass | Echinochloa | ECHIN4 | Poaceae | Monocot |
| cockspur hawthorn | Crataegus crus-galli | CRCR2 | Rosaceae | Dicot |
| coffeetree | Gymnocladus | GYMNO2 | Fabaceae | Dicot |
| cohosh | Caulophyllum | CAULO | Berberidaceae | Dicot |
| colicroot | Aletris | ALETR | Liliaceae | Monocot |
| collegeflower | Hymenopappus flavescens | HYFL | Asteraceae | Dicot |
| collegeflower | Hymenopappus flavescens var. flavescens | HYFLF | Asteraceae | Dicot |
| Colorado greenthread | Thelesperma ambiguum | THAM4 | Asteraceae | Dicot |
| Columbian watermeal | Wolffia columbiana | WOCO | Lemnaceae | Monocot |
| columbine | Aquilegia | AQUIL | Ranunculaceae | Dicot |
| colutea | Colutea | COLUT | Fabaceae | Dicot |
| combleaf yellow false foxglove | Aureolaria pectinata | AUPE | Scrophulariaceae | Dicot |
| common balm | Melissa officinalis | MEOF2 | Lamiaceae | Dicot |
| common barley | Hordeum vulgare | HOVU | Poaceae | Monocot |
| common bladderwort | Utricularia macrorhiza | UTMA | Lentibulariaceae | Dicot |
| common blue violet | Viola sororia | VISO | Violaceae | Dicot |
| common boneset | Eupatorium perfoliatum | EUPE3 | Asteraceae | Dicot |
| common boneset | Eupatorium perfoliatum var. perfoliatum | EUPEP | Asteraceae | Dicot |
| common buttonbush | Cephalanthus occidentalis | CEOC2 | Rubiaceae | Dicot |
| common carpetgrass | Axonopus fissifolius | AXFI | Poaceae | Monocot |
| common chickweed | Stellaria media | STME2 | Caryophyllaceae | Dicot |
| common chickweed | Stellaria media ssp. media | STMEM | Caryophyllaceae | Dicot |
| common cinquefoil | Potentilla simplex | POSI2 | Rosaceae | Dicot |
| common corncockle | Agrostemma githago | AGGI | Caryophyllaceae | Dicot |
| common dandelion | Taraxacum officinale | TAOF | Asteraceae | Dicot |
| common dandelion | Taraxacum officinale ssp. officinale | TAOFO | Asteraceae | Dicot |
| common dittany | Cunila origanoides | CUOR | Lamiaceae | Dicot |
| common duckmeat | Spirodela polyrrhiza | SPPO | Lemnaceae | Monocot |
| common duckweed | Lemna minor | LEMI3 | Lemnaceae | Monocot |
| common evening primrose | Oenothera biennis | OEBI | Onagraceae | Dicot |
| common flax | Linum usitatissimum | LIUS | Linaceae | Dicot |
| common goldstar | Hypoxis hirsuta | HYHI2 | Liliaceae | Monocot |
| common hackberry | Celtis occidentalis | CEOC | Ulmaceae | Dicot |
| common hardgrass | Sclerochloa dura | SCDU2 | Poaceae | Monocot |
| common hop | Humulus lupulus | HULU | Cannabaceae | Dicot |
| common hop | Humulus lupulus var. pubescens | HULUP | Cannabaceae | Dicot |
| common hoptree | Ptelea trifoliata | PTTR | Rutaceae | Dicot |
| common hoptree | Ptelea trifoliata ssp. angustifolia | PTTRA | Rutaceae | Dicot |
| common hoptree | Ptelea trifoliata ssp. angustifolia var. angustifolia | PTTRA2 | Rutaceae | Dicot |
| common hoptree | Ptelea trifoliata ssp. angustifolia var. persicifolia | PTTRP3 | Rutaceae | Dicot |
| common hoptree | Ptelea trifoliata ssp. trifoliata | PTTRT | Rutaceae | Dicot |
| common hoptree | Ptelea trifoliata ssp. trifoliata var. trifoliata | PTTRT2 | Rutaceae | Dicot |
| common ladyfern | Athyrium filix-femina | ATFI | Dryopteridaceae | Fern |
| common maidenhair | Adiantum capillus-veneris | ADCA | Pteridaceae | Fern |
| common mallow | Malva neglecta | MANE | Malvaceae | Dicot |
| common milkweed | Asclepias syriaca | ASSY | Asclepiadaceae | Dicot |
| common moonseed | Menispermum canadense | MECA3 | Menispermaceae | Dicot |
| common motherwort | Leonurus cardiaca | LECA2 | Lamiaceae | Dicot |
| common motherwort | Leonurus cardiaca ssp. cardiaca | LECAC7 | Lamiaceae | Dicot |
| common mouse-ear chickweed | Cerastium fontanum | CEFO2 | Caryophyllaceae | Dicot |
| common mullein | Verbascum thapsus | VETH | Scrophulariaceae | Dicot |
| common ninebark | Physocarpus opulifolius | PHOP | Rosaceae | Dicot |
| common nipplewort | Lapsana communis | LACO3 | Asteraceae | Dicot |
| common oat | Avena sativa | AVSA | Poaceae | Monocot |
| common pepperweed | Lepidium densiflorum | LEDE | Brassicaceae | Dicot |
| common persimmon | Diospyros virginiana | DIVI5 | Ebenaceae | Dicot |
| common plantain | Plantago major | PLMA2 | Plantaginaceae | Dicot |
| common pricklyash | Zanthoxylum americanum | ZAAM | Rutaceae | Dicot |
| common reed | Phragmites australis | PHAU7 | Poaceae | Monocot |
| common rush | Juncus effusus | JUEF | Juncaceae | Monocot |
| common salttree | Halimodendron halodendron | HAHA8 | Fabaceae | Dicot |
| common selfheal | Prunella vulgaris | PRVU | Lamiaceae | Dicot |
| common serviceberry | Amelanchier arborea var. arborea | AMARA4 | Rosaceae | Dicot |
| common serviceberry | Amelanchier arborea | AMAR3 | Rosaceae | Dicot |
| common sheep sorrel | Rumex acetosella | RUAC3 | Polygonaceae | Dicot |
| common sneezeweed | Helenium autumnale | HEAU | Asteraceae | Dicot |
| common sneezeweed | Helenium autumnale var. autumnale | HEAUA | Asteraceae | Dicot |
| common sowthistle | Sonchus oleraceus | SOOL | Asteraceae | Dicot |
| common spikerush | Eleocharis palustris | ELPA3 | Cyperaceae | Monocot |
| common spikerush | Eleocharis palustris var. palustris | ELPAP | Cyperaceae | Monocot |
| common St. Johnswort | Hypericum perforatum | HYPE | Clusiaceae | Dicot |
| common sunflower | Helianthus annuus | HEAN3 | Asteraceae | Dicot |
| common sweetleaf | Symplocos tinctoria | SYTI | Symplocaceae | Dicot |
| common tansy | Tanacetum vulgare | TAVU | Asteraceae | Dicot |
| common threeseed mercury | Acalypha rhomboidea | ACRH | Euphorbiaceae | Dicot |
| common threesquare | Schoenoplectus pungens | SCPU10 | Cyperaceae | Monocot |
| common threesquare | Schoenoplectus pungens var. longispicatus | SCPUL4 | Cyperaceae | Monocot |
| common velvetgrass | Holcus lanatus | HOLA | Poaceae | Monocot |
| common viper"s bugloss | Echium vulgare | ECVU | Boraginaceae | Dicot |
| common wheat | Triticum aestivum | TRAE | Poaceae | Monocot |
| common wolfstail | Lycurus phleoides | LYPH | Poaceae | Monocot |
| common yarrow | Achillea millefolium | ACMI2 | Asteraceae | Dicot |
| common yellow oxalis | Oxalis stricta | OXST | Oxalidaceae | Dicot |
| compact dodder | Cuscuta compacta | CUCO2 | Cuscutaceae | Dicot |
| compact dodder | Cuscuta compacta var. compacta | CUCOC | Cuscutaceae | Dicot |
| compact onion | Allium vineale ssp. compactum | ALVIC3 | Liliaceae | Monocot |
| compact prairie clover | Dalea compacta | DACO2 | Fabaceae | Dicot |
| compact prairie clover | Dalea compacta var. compacta | DACOC | Fabaceae | Dicot |
| compact prairie clover | Dalea compacta var. pubescens | DACOP | Fabaceae | Dicot |
| compassplant | Silphium laciniatum | SILA3 | Asteraceae | Dicot |
| compassplant | Silphium laciniatum var. laciniatum | SILAL2 | Asteraceae | Dicot |
| composite dropseed | Sporobolus compositus | SPCO16 | Poaceae | Monocot |
| composite dropseed | Sporobolus compositus var. compositus | SPCOC2 | Poaceae | Monocot |
| composite dropseed | Sporobolus compositus var. macer | SPCOM | Poaceae | Monocot |
| coneflower | Rudbeckia | RUDBE | Asteraceae | Dicot |
| coneflower | Dracopis | DRACO3 | Asteraceae | Dicot |
| Cooley"s bundleflower | Desmanthus cooleyi | DECO2 | Fabaceae | Dicot |
| coon"s tail | Ceratophyllum demersum | CEDE4 | Ceratophyllaceae | Dicot |
| Copenhagen hawthorn | Crataegus intricata | CRIN3 | Rosaceae | Dicot |
| copper globemallow | Sphaeralcea angustifolia | SPAN3 | Malvaceae | Dicot |
| copperleaf | Acalypha | ACALY | Euphorbiaceae | Dicot |
| coralbead | Cocculus | COCCU | Menispermaceae | Dicot |
| coralberry | Symphoricarpos orbiculatus | SYOR | Caprifoliaceae | Dicot |
| coralroot | Corallorhiza | CORAL5 | Orchidaceae | Monocot |
| cordgrass | Spartina | SPART | Poaceae | Monocot |
| coriander | Coriandrum | CORIA | Apiaceae | Dicot |
| coriander | Coriandrum sativum | COSA | Apiaceae | Dicot |
| corn gromwell | Buglossoides arvensis | BUAR3 | Boraginaceae | Dicot |
| corn speedwell | Veronica arvensis | VEAR | Scrophulariaceae | Dicot |
| corncockle | Agrostemma | AGROS | Caryophyllaceae | Dicot |
| cornsalad | Valerianella | VALER2 | Valerianaceae | Dicot |
| Correll"s buckwheat | Eriogonum correllii | ERCO21 | Polygonaceae | Dicot |
| cosmopolitan bulrush | Schoenoplectus maritimus | SCMA8 | Cyperaceae | Monocot |
| cosmos | Cosmos | COSMO | Asteraceae | Dicot |
| cottonbatting plant | Pseudognaphalium stramineum | PSST7 | Asteraceae | Dicot |
| cottonflower | Gossypianthus | GOSSY2 | Amaranthaceae | Dicot |
| cottonthistle | Onopordum | ONOPO | Asteraceae | Dicot |
| cottonwood | Populus | POPUL | Salicaceae | Dicot |
| cow soapwort | Vaccaria hispanica | VAHI2 | Caryophyllaceae | Dicot |
| cowbane | Oxypolis | OXYPO | Apiaceae | Dicot |
| crabgrass | Digitaria | DIGIT2 | Poaceae | Monocot |
| cracked lichen | Acarospora | ACARO2 | Acarosporaceae | Lichen |
| Crawe"s sedge | Carex crawei | CACR3 | Cyperaceae | Monocot |
| cream milkvetch | Astragalus racemosus | ASRA2 | Fabaceae | Dicot |
| cream milkvetch | Astragalus racemosus var. racemosus | ASRAR2 | Fabaceae | Dicot |
| creek plum | Prunus rivularis | PRRI | Rosaceae | Dicot |
| creeper | Parthenocissus | PARTH3 | Vitaceae | Dicot |
| creeping burhead | Echinodorus cordifolius | ECCO3 | Alismataceae | Monocot |
| creeping eryngo | Eryngium prostratum | ERPR5 | Apiaceae | Dicot |
| creeping lespedeza | Lespedeza repens | LERE2 | Fabaceae | Dicot |
| creeping lovegrass | Neeragrostis | NEERA2 | Poaceae | Monocot |
| creeping lovegrass | Neeragrostis reptans | NERE3 | Poaceae | Monocot |
| creeping nailwort | Paronychia sessiliflora | PASE | Caryophyllaceae | Dicot |
| creeping primrose-willow | Ludwigia repens | LURE2 | Onagraceae | Dicot |
| creeping woodsorrel | Oxalis corniculata | OXCO | Oxalidaceae | Dicot |
| crested coralroot | Hexalectris | HEXAL | Orchidaceae | Monocot |
| crested pricklypoppy | Argemone polyanthemos | ARPO2 | Papaveraceae | Dicot |
| crested wheatgrass | Agropyron cristatum | AGCR | Poaceae | Monocot |
| crested wheatgrass | Agropyron cristatum ssp. pectinatum | AGCRP8 | Poaceae | Monocot |
| crimson clover | Trifolium incarnatum | TRIN3 | Fabaceae | Dicot |
| crimsoneyed rosemallow | Hibiscus moscheutos | HIMO | Malvaceae | Dicot |
| crippled cranefly | Tipularia discolor | TIDI | Orchidaceae | Monocot |
| crossflower | Chorispora tenella | CHTE2 | Brassicaceae | Dicot |
| crossvine | Bignonia capreolata | BICA | Bignoniaceae | Dicot |
| croton | Croton | CROTO | Euphorbiaceae | Dicot |
| crownbeard | Verbesina | VERBE2 | Asteraceae | Dicot |
| crowngrass | Paspalum | PASPA2 | Poaceae | Monocot |
| crownvetch | Securigera | SECUR3 | Fabaceae | Dicot |
| crownvetch | Securigera varia | SEVA4 | Fabaceae | Dicot |
| crowpoison | Nothoscordum bivalve | NOBI2 | Liliaceae | Monocot |
| cryptantha | Cryptantha | CRYPT | Boraginaceae | Dicot |
| Cuban jute | Sida rhombifolia | SIRH | Malvaceae | Dicot |
| cucumber tree | Magnolia acuminata | MAAC | Magnoliaceae | Dicot |
| cudweed | Pseudognaphalium | PSEUD43 | Asteraceae | Dicot |
| cultivated garlic | Allium sativum | ALSA2 | Liliaceae | Monocot |
| Culver"s root | Veronicastrum virginicum | VEVI4 | Scrophulariaceae | Dicot |
| Cuman ragweed | Ambrosia psilostachya | AMPS | Asteraceae | Dicot |
| Cumberland sandreed | Calamovilfa arcuata | CAAR12 | Poaceae | Monocot |
| cunila | Cunila | CUNIL | Lamiaceae | Dicot |
| cup lichen | Cladonia | CLADO3 | Cladoniaceae | Lichen |
| cup plant | Silphium perfoliatum | SIPE2 | Asteraceae | Dicot |
| cup plant | Silphium perfoliatum var. perfoliatum | SIPEP | Asteraceae | Dicot |