| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| CAVE19 | Catinaria versicolor (Fee) Sipman | Lopezaria versicolor | Uncertain Lichen Family
|
| CATIN | Catinaria Vainio | catinaria | Bacidiaceae
|
| CAWA5 | Catolechia wahlenbergii (Ach.) Korber | | Rhizocarpaceae
|
| CATOL | Catolechia Flotow | catolechia | Rhizocarpaceae
|
| CABE5 | Catopsis berteroniana (J.A. & J.H. Schultes) Mez | powdery strap airplant | Bromeliaceae
|
| CAFL10 | Catopsis floribunda L.B. Sm. | Florida strap airplant | Bromeliaceae
|
| CANI6 | Catopsis nitida (Hook.) Griseb. | Caribbean strap airplant | Bromeliaceae
|
| CANU7 | Catopsis nutans (Sw.) Griseb. | nodding strap airplant | Bromeliaceae
|
| CANU13 | Catopsis nutans auct. non (Sw.) Griseb. | Catopsis floribunda | Bromeliaceae
|
| CASE7 | Catopsis sessiliflora (Ruiz & Pav�n) Mez | sessileleaf strap airplant | Bromeliaceae
|
| CATOP | Catopsis Griseb. | strap airplant | Bromeliaceae
|
| CANI15 | Catoscopium nigritum (Hedw.) Brid. | black golf club moss | Catoscopiaceae
|
| CATOS2 | Catoscopium Brid. | golf club moss | Catoscopiaceae
|
| CAGA10 | Cattleya gaskelliana Sander | | Orchidaceae
|
| CALA82 | Cattleya labiata Lindl. | | Orchidaceae
|
| CATTL2 | Cattleya Lindl. | cattleya | Orchidaceae
|
| CALA55 | Caucalis latifolia L. | Turgenia latifolia | Apiaceae
|
| CAMI27 | Caucalis microcarpa Hook. & Arn. | Yabea microcarpa | Apiaceae
|
| CAPL11 | Caucalis platycarpos L. | carrot burr parsley | Apiaceae
|
| CAUCA | Caucalis L. | burr parsley | Apiaceae
|
| CALE44 | Caudalejeunea lehmanniana (Gottsche) A. Evans | | Lejeuneaceae
|
| CAUDA | Caudalejeunea (Spruce) Schiffn. | | Lejeuneaceae
|
| CAAMA | Caulanthus amplexicaulis S. Wats. var. amplexicaulis | claspingleaf wild cabbage | Brassicaceae
|
| CAAMB | Caulanthus amplexicaulis S. Wats. var. barbarae (J.T. Howell) Munz | claspingleaf wild cabbage | Brassicaceae
|
| CAAM11 | Caulanthus amplexicaulis S. Wats. | claspingleaf wild cabbage | Brassicaceae
|
| CAAN25 | Caulanthus anceps Payson | Guillenia lemmonii | Brassicaceae
|
| CABA11 | Caulanthus barnebyi Rollins & P. Holmgren | Black Rock wild cabbage | Brassicaceae
|
| CACA21 | Caulanthus californicus (S. Wats.) Payson | Stanfordia californica | Brassicaceae
|
| CACO18 | Caulanthus cooperi (S. Wats.) Payson | Cooper's wild cabbage | Brassicaceae
|
| CACOL2 | Caulanthus coulteri S. Wats. var. lemmonii (S. Wats.) Munz | Guillenia lemmonii | Brassicaceae
|
| CACO38 | Caulanthus coulteri S. Wats. | Coulter's wild cabbage | Brassicaceae
|
| CACRC | Caulanthus crassicaulis (Torr.) S. Wats. var. crassicaulis | thickstem wild cabbage | Brassicaceae
|
| CACRG | Caulanthus crassicaulis (Torr.) S. Wats. var. glaber M.E. Jones | thickstem wild cabbage | Brassicaceae
|
| CACRM4 | Caulanthus crassicaulis (Torr.) S. Wats. var. major M.E. Jones | Caulanthus major var. major | Brassicaceae
|
| CACR11 | Caulanthus crassicaulis (Torr.) S. Wats. | thickstem wild cabbage | Brassicaceae
|
| CADI11 | Caulanthus divaricatus Rollins | Thelypodiopsis divaricata | Brassicaceae
|
| CAFL15 | Caulanthus flavescens (Hook.) Payson | Guillenia flavescens | Brassicaceae
|
| CAGL14 | Caulanthus glaber (M.E. Jones) Rydb. | Caulanthus crassicaulis var. glaber | Brassicaceae
|
| CAGL12 | Caulanthus glaucus S. Wats. | glaucous wild cabbage | Brassicaceae
|
| CAHA8 | Caulanthus hallii Payson | Hall's wild cabbage | Brassicaceae
|
| CAHEH4 | Caulanthus heterophyllus (Nutt.) Payson var. heterophyllus | San Diego wild cabbage | Brassicaceae
|
| CAHEP | Caulanthus heterophyllus (Nutt.) Payson var. pseudosimulans R. Buck | San Diego wild cabbage | Brassicaceae
|
| CAHE11 | Caulanthus heterophyllus (Nutt.) Payson | San Diego wild cabbage | Brassicaceae
|
| CAIN15 | Caulanthus inflatus S. Wats. | desert candle | Brassicaceae
|
| CALAI | Caulanthus lasiophyllus (Hook. & Arn.) Payson var. inalienus (B.L. Robins.) Payson | Guillenia lasiophylla | Brassicaceae
|
| CALAR | Caulanthus lasiophyllus (Hook. & Arn.) Payson var. rigidus (Greene) Payson | Guillenia lasiophylla | Brassicaceae
|
| CALAU | Caulanthus lasiophyllus (Hook. & Arn.) Payson var. utahensis (Rydb.) Payson | Guillenia lasiophylla | Brassicaceae
|
| CALA35 | Caulanthus lasiophyllus (Hook. & Arn.) Payson | Guillenia lasiophylla | Brassicaceae
|
| CALE25 | Caulanthus lemmonii S. Wats. | Guillenia lemmonii | Brassicaceae
|
| CAMAM14 | Caulanthus major (M.E. Jones) Payson var. major | slender wild cabbage | Brassicaceae
|
| CAMAN | Caulanthus major (M.E. Jones) Payson var. nevadensis Rollins | slender wild cabbage | Brassicaceae
|
| CAMA17 | Caulanthus major (M.E. Jones) Payson | slender wild cabbage | Brassicaceae
|
| CAPI4 | Caulanthus pilosus S. Wats. | hairy wild cabbage | Brassicaceae
|
| CASI5 | Caulanthus simulans Payson | Payson's wild cabbage | Brassicaceae
|
| CAST14 | Caulanthus stenocarpus Payson | Guillenia lasiophylla | Brassicaceae
|
| CASU20 | Caulanthus sulfureus Payson | Brassica rapa var. rapa | Brassicaceae
|
| CAULA | Caulanthus S. Wats. | wild cabbage | Brassicaceae
|
| CATA5 | Caulerpa taxifolia (Vahl) C. Ag. | caulerpa | Caulerpaceae
|
| CAULE | Caulerpa J. V. F. Lamouroux | caulerpa | Caulerpaceae
|
| CAFL27 | Caulinia flexilis Willd. | Najas flexilis | Najadaceae
|
| CAGR18 | Caulinia graminea (Delile) Tzvelev | Najas graminea | Najadaceae
|
| CAGU5 | Caulinia guadalupensis Spreng. | Najas guadalupensis ssp. guadalupensis | Najadaceae
|
| CAMI28 | Caulinia minor (All.) Coss. & Germ. | Najas minor | Najadaceae
|
| CAGI6 | Caulophyllum giganteum (Farw.) Loconte & Blackwell | giant blue cohosh | Berberidaceae
|
| CATHG | Caulophyllum thalictroides (L.) Michx. var. giganteum Farw. | Caulophyllum giganteum | Berberidaceae
|
| CATH2 | Caulophyllum thalictroides (L.) Michx. | blue cohosh | Berberidaceae
|
| CAULO | Caulophyllum Michx. | cohosh | Berberidaceae
|
| CAJA5 | Caulostramina jaegeri (Rollins) Rollins | cliffdweller | Brassicaceae
|
| CAULO2 | Caulostramina Rollins | caulostramina | Brassicaceae
|
| CAHU60 | Cavernularia hultenii Degel. | Hulten's pitted lichen | Parmeliaceae
|
| CALO60 | Cavernularia lophyrea (Ach.) Degel. | pitted lichen | Parmeliaceae
|
| CAVER2 | Cavernularia Degel. | pitted lichen | Parmeliaceae
|
| CAAM15 | Cayaponia americana (Lam.) Cogn. | American melonleaf | Cucurbitaceae
|
| CABO11 | Cayaponia boykinii (Torr. & Gray) Cogn. | Cayaponia quinqueloba | Cucurbitaceae
|
| CAGR17 | Cayaponia grandifolia (Torr. & Gray) Small | Cayaponia quinqueloba | Cucurbitaceae
|
| CAQU3 | Cayaponia quinqueloba (Raf.) Shinners | fivelobe cucumber | Cucurbitaceae
|
| CARA10 | Cayaponia racemosa (P. Mill.) Cogn. | mountain melonleaf | Cucurbitaceae
|
| CAYAP | Cayaponia Silva Manso | melonleaf | Cucurbitaceae
|
| CAJA7 | Cayratia japonica (Thunb.) Gagnepain | bushkiller | Vitaceae
|
| CATR29 | Cayratia trifolia (L.) Domin | threeleaf cayratia | Vitaceae
|
| CAYRA | Cayratia Juss. | cayratia | Vitaceae
|
| CEAMI | Ceanothus americanus L. var. intermedius (Pursh) Torr. & Gray | Ceanothus americanus | Rhamnaceae
|
| CEAMP | Ceanothus americanus L. var. pitcheri Torr. & Gray | Ceanothus americanus | Rhamnaceae
|
| CEAM | Ceanothus americanus L. | New Jersey tea | Rhamnaceae
|
| CEAN2 | Ceanothus andersonii Parry | Ceanothus integerrimus | Rhamnaceae
|
| CEARG | Ceanothus arboreus Greene var. glabra Jepson | Ceanothus arboreus | Rhamnaceae
|
| CEAR | Ceanothus arboreus Greene | feltleaf ceanothus | Rhamnaceae
|
| CEAR2 | Ceanothus �arcuatus McMinn (pro sp.) | | Rhamnaceae
|
| CEAU5 | Ceanothus austromontanus Abrams | Ceanothus foliosus var. foliosus | Rhamnaceae
|
| CEBA | Ceanothus �bakeri Greene ex C.F. Baker (pro sp.) | | Rhamnaceae
|
| CECA7 | Ceanothus californicus Kellogg | Ceanothus integerrimus | Rhamnaceae
|
| CECO6 | Ceanothus confusus J.T. Howell | Rincon Ridge ceanothus | Rhamnaceae
|
| CECO2 | Ceanothus connivens Greene | trailing buckbrush | Rhamnaceae
|
| CECO | Ceanothus cordulatus Kellogg | whitethorn ceanothus | Rhamnaceae
|
| CECRP | Ceanothus crassifolius Torr. var. planus Abrams | Ceanothus crassifolius | Rhamnaceae
|
| CECR | Ceanothus crassifolius Torr. | hoaryleaf ceanothus | Rhamnaceae
|
| CECUC3 | Ceanothus cuneatus (Hook.) Nutt. var. cuneatus | buckbrush | Rhamnaceae
|
| CECUD | Ceanothus cuneatus (Hook.) Nutt. var. dubius J.T. Howell | Ceanothus cuneatus var. cuneatus | Rhamnaceae
|
| CECUF2 | Ceanothus cuneatus (Hook.) Nutt. var. fascicularis (McMinn) Hoover | sedgeleaf buckbrush | Rhamnaceae
|
| CECUR2 | Ceanothus cuneatus (Hook.) Nutt. var. rigidus (Nutt.) Hoover | Monterey ceanothus | Rhamnaceae
|
| CECUS | Ceanothus cuneatus (Hook.) Nutt. var. submontanus (Rose) McMinn | Ceanothus cuneatus var. cuneatus | Rhamnaceae
|