| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| CADRR | Cardaria draba (L.) Desv. var. repens (Schrenk) O.E. Schulz | Cardaria chalapensis | Brassicaceae
|
| CADR | Cardaria draba (L.) Desv. | whitetop | Brassicaceae
|
| CALA80 | Cardaria latifolia (L.) Spach | Lepidium latifolium | Brassicaceae
|
| CAPUE | Cardaria pubescens (C.A. Mey.) Jarmolenko var. elongata Rollins | Cardaria pubescens | Brassicaceae
|
| CAPU6 | Cardaria pubescens (C.A. Mey.) Jarmolenko | hairy whitetop | Brassicaceae
|
| CARE23 | Cardaria repens (Schrenk) Jarmolenko | Cardaria chalapensis | Brassicaceae
|
| CARDA2 | Cardaria Desv. | whitetop | Brassicaceae
|
| CARA3 | Cardionema ramosissimum (Weinm.) A. Nels. & J.F. Macbr. | sandcarpet | Caryophyllaceae
|
| CARDI | Cardionema DC. | cardionema | Caryophyllaceae
|
| CACOV2 | Cardiospermum corindum L. var. villosum (P. Mill.) Radlk. | Cardiospermum corindum | Sapindaceae
|
| CACO31 | Cardiospermum corindum L. | faux persil | Sapindaceae
|
| CADI15 | Cardiospermum dissectum (S. Wats.) Radlk. | Chihuahuan balloonvine | Sapindaceae
|
| CAGR13 | Cardiospermum grandiflorum Sw. | showy balloonvine | Sapindaceae
|
| CAHAM3 | Cardiospermum halicacabum L. var. microcarpum (Kunth) Blume | Cardiospermum microcarpum | Sapindaceae
|
| CAHA13 | Cardiospermum halicacabum L. | love in a puff | Sapindaceae
|
| CAKE6 | Cardiospermum keyense Small | Cardiospermum corindum | Sapindaceae
|
| CAMI21 | Cardiospermum microcarpum Kunth | heartseed | Sapindaceae
|
| CARDI2 | Cardiospermum L. | balloonvine | Sapindaceae
|
| CAAC | Carduus acanthoides L. | spiny plumeless thistle | Asteraceae
|
| CAAL22 | Carduus altissimus L. | Cirsium altissimum | Asteraceae
|
| CAAM19 | Carduus americanus (Gray) Rydb. | Cirsium tioganum var. tioganum | Asteraceae
|
| CAAR22 | Carduus araneosus Osterhout | Cirsium araneans | Asteraceae
|
| CAAR29 | Carduus arvensis (L.) Robson | Cirsium arvense | Asteraceae
|
| CAAU14 | Carduus austrinus Small | Cirsium texanum | Asteraceae
|
| CACA47 | Carduus carolinianus Walt. | Cirsium carolinianum | Asteraceae
|
| CACO52 | Carduus coloradensis Rydb. | Cirsium tioganum var. coloradense | Asteraceae
|
| CACR2 | Carduus crispus L. | curly plumeless thistle | Asteraceae
|
| CADI25 | Carduus discolor (Muhl. ex Willd.) Nutt. | Cirsium discolor | Asteraceae
|
| CAHE13 | Carduus helleri Small | Cirsium undulatum var. undulatum | Asteraceae
|
| CAIN27 | Carduus inamoenus Greene | Cirsium neomexicanum var. utahense | Asteraceae
|
| CALA58 | Carduus lanceolatus L. | Cirsium vulgare | Asteraceae
|
| CALE29 | Carduus lecontei (Torr. & Gray) Pollard | Cirsium lecontei | Asteraceae
|
| CAMA31 | Carduus macounii Greene | Cirsium edule | Asteraceae
|
| CAMA29 | Carduus macrocephalus Desf. | Carduus nutans ssp. macrocephalus | Asteraceae
|
| CAMA30 | Carduus macrolepis Peterm. | Carduus nutans ssp. macrolepis | Asteraceae
|
| CAMA32 | Carduus marianus L. | Silybum marianum | Asteraceae
|
| CAMU16 | Carduus muticus (Michx.) Pers. | Cirsium muticum | Asteraceae
|
| CANE21 | Carduus nevadensis Greene | Cirsium humboldtense | Asteraceae
|
| CANUL | Carduus nutans L. ssp. leiophyllus (Petrovic) Stojanov & Stef. | nodding plumeless thistle | Asteraceae
|
| CANUM | Carduus nutans L. ssp. macrocephalus (Desf.) Nyman | nodding plumeless thistle | Asteraceae
|
| CANUM2 | Carduus nutans L. ssp. macrolepis (Peterm.) Kazmi | nodding plumeless thistle | Asteraceae
|
| CANUN | Carduus nutans L. ssp. nutans | nodding plumeless thistle | Asteraceae
|
| CANUL2 | Carduus nutans L. var. leiophyllus (Petrovic) Ar�nes | Carduus nutans ssp. leiophyllus | Asteraceae
|
| CANUM3 | Carduus nutans L. var. macrocephalus (Desf.) Boivin | Carduus nutans ssp. macrocephalus | Asteraceae
|
| CANUV | Carduus nutans L. var. vestitus (Hallier) Boivin | Carduus nutans ssp. leiophyllus | Asteraceae
|
| CANU4 | Carduus nutans L. | nodding plumeless thistle | Asteraceae
|
| CANU16 | Carduus nuttallii (DC.) Pollard | Cirsium nuttallii | Asteraceae
|
| CAOR8 | Carduus �orthocephalus Wallr. | | Asteraceae
|
| CAPI13 | Carduus pinetorum Small | Cirsium horridulum var. horridulum | Asteraceae
|
| CAPU31 | Carduus pulchellus Greene | Cirsium calcareum | Asteraceae
|
| CAPU30 | Carduus pumilus Nutt. | Cirsium pumilum | Asteraceae
|
| CAPY2 | Carduus pycnocephalus L. | Italian plumeless thistle | Asteraceae
|
| CARE13 | Carduus repandus (Michx.) Pers. | Cirsium repandum | Asteraceae
|
| CASM | Carduus smallii (Britt.) Ahles | Cirsium horridulum var. horridulum | Asteraceae
|
| CASP17 | Carduus spathulatus Osterhout | Cirsium scapanolepis | Asteraceae
|
| CASP16 | Carduus spinosissimus Walt. | Cirsium horridulum var. horridulum | Asteraceae
|
| CATE2 | Carduus tenuiflorus W. Curtis | winged plumeless thistle | Asteraceae
|
| CATR14 | Carduus tracyi Rydb. | Cirsium undulatum var. tracyi | Asteraceae
|
| CATR19 | Carduus truncatus Greene | Cirsium calcareum | Asteraceae
|
| CAUNC | Carduus undulatus Nutt. var. canescens (Nutt.) Porter | Cirsium canescens | Asteraceae
|
| CAUN9 | Carduus undulatus Nutt. | Cirsium undulatum var. undulatum | Asteraceae
|
| CAVI10 | Carduus virginianus L. | Cirsium virginianum | Asteraceae
|
| CAVU4 | Carduus vulgaris Savi | Cirsium vulgare | Asteraceae
|
| CARDU | Carduus L. | plumeless thistle | Asteraceae
|
| CAAB10 | Carex abacta Bailey | Carex michauxiana | Cyperaceae
|
| CAAB9 | Carex abbreviata Prescott | Carex torreyi | Cyperaceae
|
| CAAB11 | Carex abdita Bickn. | Carex umbellata | Cyperaceae
|
| CAAB8 | Carex ablata Bailey | Carex luzulina var. ablata | Cyperaceae
|
| CAAB4 | Carex aboriginum auct. non M.E. Jones, 1910 | Carex parryana var. brevisquama | Cyperaceae
|
| CAAB2 | Carex abrupta Mackenzie | abruptbeak sedge | Cyperaceae
|
| CAABG | Carex abscondita Mackenzie var. glauca (Chapman) Fern. | Carex abscondita | Cyperaceae
|
| CAABR | Carex abscondita Mackenzie var. rostellata Fern. | Carex abscondita | Cyperaceae
|
| CAAB5 | Carex abscondita Mackenzie | thicket sedge | Cyperaceae
|
| CAAB6 | Carex �absconditiformis Fern. | | Cyperaceae
|
| CAAC9 | Carex accedens Holm | Carex aperta | Cyperaceae
|
| CAAC5 | Carex acuta auct. non L. | Carex nigra | Cyperaceae
|
| CAAC2 | Carex acutiformis Ehrh. | lesser pond sedge | Cyperaceae
|
| CAACT | Carex acutina Bailey var. tenuior Bailey | Carex aperta | Cyperaceae
|
| CAAC10 | Carex acutinella Mackenzie | Carex aquatilis var. aquatilis | Cyperaceae
|
| CAAD | Carex adelostoma Krecz. | circumpolar sedge | Cyperaceae
|
| CAAD2 | Carex adusta Boott | lesser brown sedge | Cyperaceae
|
| CAAE | Carex aenea Fern. | Carex foenea var. foenea | Cyperaceae
|
| CAAE3 | Carex �aestivaliformis Mackenzie | | Cyperaceae
|
| CAAE2 | Carex aestivalis M.A. Curtis ex Gray | summer sedge | Cyperaceae
|
| CAAG2 | Carex aggregata Mackenzie | glomerate sedge | Cyperaceae
|
| CAAG | Carex agrostoides Mackenzie | grassleaf sedge | Cyperaceae
|
| CAAL3 | Carex alata Torr. | broadwing sedge | Cyperaceae
|
| CAALA | Carex albicans Willd. ex Spreng. var. albicans | whitetinge sedge | Cyperaceae
|
| CAALA2 | Carex albicans Willd. ex Spreng. var. australis (Bailey) J. Rettig | stellate sedge | Cyperaceae
|
| CAALE | Carex albicans Willd. ex Spreng. var. emmonsii (Dewey ex Torr.) J. Rettig | Emmons' sedge | Cyperaceae
|
| CAAL25 | Carex albicans Willd. ex Spreng. | whitetinge sedge | Cyperaceae
|
| CAAL23 | Carex albicans auct. non Willd. ex Spreng. | Carex peckii | Cyperaceae
|
| CAAL4 | Carex albida Bailey | white sedge | Cyperaceae
|
| CAAL5 | Carex albolutescens Schwein. | greenwhite sedge | Cyperaceae
|
| CAAL6 | Carex albonigra Mackenzie | blackandwhite sedge | Cyperaceae
|
| CAAL11 | Carex albursina Sheldon | white bear sedge | Cyperaceae
|
| CAAL20 | Carex allegheniensis Mackenzie | Carex debilis var. pubera | Cyperaceae
|
| CAALD | Carex alligata Boott var. degeneri R.W. Krauss | Carex alligata | Cyperaceae
|
| CAAL12 | Carex alligata Boott | Hawai'i sedge | Cyperaceae
|
| CAAL7 | Carex alma Bailey | sturdy sedge | Cyperaceae
|
| CAAL8 | Carex alopecoidea Tuckerman | foxtail sedge | Cyperaceae
|