| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| CRYPT7 | Cryptocoryne Fisch. ex Wydl. | watertrumpet | Araceae
|
| CRAC3 | Cryptogramma acrostichoides R. Br. | American rockbrake | Pteridaceae
|
| CRCA23 | Cryptogramma cascadensis E.R. Alverson | Cascade rockbrake | Pteridaceae
|
| CRCRA2 | Cryptogramma crispa (L.) R. Br. ex Hook. ssp. acrostichoides (R. Br.) Hult�n | Cryptogramma acrostichoides | Pteridaceae
|
| CRCRS | Cryptogramma crispa (L.) R. Br. ex Hook. var. sitchensis (Rupr.) C. Christens. | Cryptogramma sitchensis | Pteridaceae
|
| CRDE10 | Cryptogramma densa (Brack.) Diels | Aspidotis densa | Pteridaceae
|
| CRSI7 | Cryptogramma sitchensis (Rupr.) T. Moore | Sitka rockbrake | Pteridaceae
|
| CRST2 | Cryptogramma stelleri (Gmel.) Prantl | fragile rockbrake | Pteridaceae
|
| CRYPT3 | Cryptogramma R. Br. | rockbrake | Pteridaceae
|
| CRCA24 | Cryptolechia carneolutea (Turner) A. Massal. | | Gyalectaceae
|
| CRYPT11 | Cryptolechia A. Massal. | cryptolechia | Gyalectaceae
|
| CRJA3 | Cryptomeria japonica (L. f.) D. Don | Japanese cedar | Taxodiaceae
|
| CRYPT4 | Cryptomeria D. Don | Japanese cedar | Taxodiaceae
|
| CRTE11 | Cryptomitrium tenerum (Hook.) Austin ex Underw. | | Aytoniaceae
|
| CRYPT9 | Cryptomitrium Austin ex Underw. | | Aytoniaceae
|
| CRGR6 | Cryptostegia grandiflora (Roxb. ex R. Br.) R. Br. | Palay rubbervine | Asclepiadaceae
|
| CRMA10 | Cryptostegia madagascariensis Bojer ex Dcne. | Madagascar rubbervine | Asclepiadaceae
|
| CRYPT6 | Cryptostegia R. Br. | rubbervine | Asclepiadaceae
|
| CRCA9 | Cryptotaenia canadensis (L.) DC. | Canadian honewort | Apiaceae
|
| CRJA7 | Cryptotaenia japonica Hassk. | Japanese honewort | Apiaceae
|
| CRYPT5 | Cryptotaenia DC. | honewort | Apiaceae
|
| CRMI16 | Cryptothallus mirabilis Malmb. | | Aneuraceae
|
| CRYPT10 | Cryptothallus Malmb. | | Aneuraceae
|
| CRRU11 | Cryptothecia rubrocincta (Ehrenb.:Fr.) Thor | | Arthoniaceae
|
| CRST13 | Cryptothecia striata Thor | | Arthoniaceae
|
| CRYPT13 | Cryptothecia Stirton | cryptothecia | Arthoniaceae
|
| CRGR14 | Cryptothele granuliformis (Nyl.) Henssen | | Lichinaceae
|
| CRPE15 | Cryptothele permiscens (Nyl.) Th. Fr. | | Lichinaceae
|
| CRYPT12 | Cryptothele Th. Fr. | cryptothele | Lichinaceae
|
| CTMA | Ctenidium malacodes Mitt. | ctenidium moss | Hypnaceae
|
| CTMO | Ctenidium molluscum (Hedw.) Mitt. | mollusc ctenidium moss | Hypnaceae
|
| CTMO2 | Ctenidium molluscum auct. E. Amer. | Ctenidium malacodes | Hypnaceae
|
| CTSC | Ctenidium schofieldii Nish. | Schofield's ctenidium moss | Hypnaceae
|
| CTENI3 | Ctenidium (Schimp.) Mitt. | ctenidium moss | Hypnaceae
|
| CTAM | Ctenitis ampla auct. non (Humb. & Bonpl. ex Willd.) Ching | Ctenitis sloanei | Dryopteridaceae
|
| CTEF | Ctenitis effusa (Sw.) Copeland | Lastreopsis effusa | Dryopteridaceae
|
| CTHIP | Ctenitis hirta (Sw.) Ching var. portoricana (C. Christens.) Proctor | diamondleaf lacefern | Dryopteridaceae
|
| CTHI | Ctenitis hirta (Sw.) Ching | diamondleaf lacefern | Dryopteridaceae
|
| CTHO | Ctenitis honolulensis (Hook.) Copeland | Honolulu lacefern | Dryopteridaceae
|
| CTLA | Ctenitis latifrons (Brack.) Copeland | delicate lacefern | Dryopteridaceae
|
| CTNE | Ctenitis nemorosa (Humb. & Bonpl. ex Willd.) Ching | eggleaf lacefern | Dryopteridaceae
|
| CTRU | Ctenitis rubiginosa (Brack.) Copeland | Nothoperanema rubiginosum | Dryopteridaceae
|
| CTSL | Ctenitis sloanei (Poepp. ex Spreng.) Morton | Florida lacefern | Dryopteridaceae
|
| CTSQ | Ctenitis squamigera (Hook. & Arn.) Copeland | Pacific lacefern | Dryopteridaceae
|
| CTSU | Ctenitis subincisa (Willd.) Ching | Megalastrum subincisa | Dryopteridaceae
|
| CTSU2 | Ctenitis submarginalis (Langsd. & Fisch.) Ching | brownhair lacefern | Dryopteridaceae
|
| CTENI2 | Ctenitis (C. Christens.) C. Christens. ex Tardieu-Blot & C. Christens | lacefern | Dryopteridaceae
|
| CTAR | Ctenium aromaticum (Walt.) Wood | toothache grass | Poaceae
|
| CTFL | Ctenium floridanum (A.S. Hitchc.) A.S. Hitchc. | Florida orangegrass | Poaceae
|
| CTENI | Ctenium Panzer | toothache grass | Poaceae
|
| CTCE | Ctenolepis cerasiformis (Stocks) Naud. | | Cucurbitaceae
|
| CTENO | Ctenolepis Benth. & Hook. f. | ctenolepis | Cucurbitaceae
|
| CUCO5 | Cubelium concolor (T.F. Forst.) Raf. | Hybanthus concolor | Violaceae
|
| CUCI | Cucubertia citrullus L. | Citrullus lanatus var. lanatus | Cucurbitaceae
|
| CUED | Cucumeropsis edulis (Hook. f.) Cogn. | Cucumeropsis mannii | Cucurbitaceae
|
| CUMA5 | Cucumeropsis mannii Naudin | Mann's cucumeropsis | Cucurbitaceae
|
| CUCUM2 | Cucumeropsis Naudin | cucumeropsis | Cucurbitaceae
|
| CUANA | Cucumis anguria L. var. anguria | West Indian gherkin | Cucurbitaceae
|
| CUANL | Cucumis anguria L. var. longaculeatus J.H. Kirkbride | West Indian gherkin | Cucurbitaceae
|
| CUAN | Cucumis anguria L. | West Indian gherkin | Cucurbitaceae
|
| CUCO4 | Cucumis colocynthis L. | Citrullus colocynthis | Cucurbitaceae
|
| CUDI2 | Cucumis dipsaceus C.G. Ehrenb. ex Spach | hedgehog gourd | Cucurbitaceae
|
| CUFI | Cucumis ficifolius A. Rich. | cucumis | Cucurbitaceae
|
| CUMED | Cucumis melo L. var. dudaim (L.) Naud. | Cucumis melo | Cucurbitaceae
|
| CUME | Cucumis melo L. | cantaloupe | Cucurbitaceae
|
| CUME3 | Cucumis metuliferus E. Mey. ex Naud. | African horned cucumber | Cucurbitaceae
|
| CUMY | Cucumis myriocarpus E. Mey. ex Naud. | gooseberry gourd | Cucurbitaceae
|
| CUPR2 | Cucumis prophetarum L. | cucumis | Cucurbitaceae
|
| CUSA4 | Cucumis sativus L. | garden cucumber | Cucurbitaceae
|
| CUCUM | Cucumis L. | melon | Cucurbitaceae
|
| CUAN3 | Cucurbita andreana Naudin | Cupressus macnabiana | Cupressaceae
|
| CUCA6 | Cucurbita californica Torr. ex S. Wats. | Cucurbita palmata | Cucurbitaceae
|
| CUDI | Cucurbita digitata Gray | fingerleaf gourd | Cucurbitaceae
|
| CUFI2 | Cucurbita ficifolia Bouche | figleaf gourd | Cucurbitaceae
|
| CUFO | Cucurbita foetidissima Kunth | Missouri gourd | Cucurbitaceae
|
| CULA2 | Cucurbita lagenaria L. | Lagenaria siceraria | Cucurbitaceae
|
| CUMAT | Cucurbita maxima Duchesne var. turbaniformis Alef. | Cupressus macnabiana | Cupressaceae
|
| CUMA3 | Cucurbita maxima Duchesne | winter squash | Cucurbitaceae
|
| CUMI3 | Cucurbita mixta Pang. | pumpkin | Cucurbitaceae
|
| CUMO | Cucurbita moschata (Duchesne ex Lam.) Duchesne ex Poir. | crookneck squash | Cucurbitaceae
|
| CUOK | Cucurbita okeechobeensis (Small) Bailey | Okeechobee gourd | Cucurbitaceae
|
| CUOV | Cucurbita ovifera L. | Cucurbita pepo var. ovifera | Cucurbitaceae
|
| CUPA | Cucurbita palmata S. Wats. | coyote gourd | Cucurbitaceae
|
| CUPEC | Cucurbita pepo L. var. condensa Bailey | Cucurbita pepo var. melopepo | Cucurbitaceae
|
| CUPEM | Cucurbita pepo L. var. melopepo (L.) Alef. | field pumpkin | Cucurbitaceae
|
| CUPEO | Cucurbita pepo L. var. ovifera (L.) Alef. | field pumpkin | Cucurbitaceae
|
| CUPEO2 | Cucurbita pepo L. var. ozarkana B. D. Sm. & C. W. Cowan | Ozark melon | Cucurbitaceae
|
| CUPEP | Cucurbita pepo L. var. pepo | field pumpkin | Cucurbitaceae
|
| CUPET | Cucurbita pepo L. var. texana (Scheele) D. Decker | Texas gourd | Cucurbitaceae
|
| CUPE | Cucurbita pepo L. | field pumpkin | Cucurbitaceae
|
| CUSI | Cucurbita siceraria Molina | Lagenaria siceraria | Cucurbitaceae
|
| CUTE | Cucurbita texana Scheele | Cucurbita pepo var. texana | Cucurbitaceae
|
| CUCUR | Cucurbita L. | gourd | Cucurbitaceae
|
| CUTR2 | Cudrania tricuspidata (Carr.) Bureau ex Lavall�e | storehousebush | Moraceae
|
| CUDRA | Cudrania Tr�cul | cudrania | Moraceae
|
| CUAM2 | Cullen americana (L.) Rydb. | American scurfpea | Fabaceae
|
| CUCO7 | Cullen corylifolia (L.) Medik. | Malaysian scurfpea | Fabaceae
|
| CULLE | Cullen Medik. | scurfpea | Fabaceae
|
| CUCY | Cuminum cyminum L. | cumin | Apiaceae
|
| CUOD2 | Cuminum odorum Salisb. | Cuminum cyminum | Apiaceae
|
| CUMIN | Cuminum L. | cumin | Apiaceae
|