| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| COIN3 | Cocculus integer Hbd. | Cocculus orbiculatus | Menispermaceae
|
| COLO2 | Cocculus lonchophyllus (Miers) Hbd. | Cocculus orbiculatus | Menispermaceae
|
| COOR11 | Cocculus orbiculatus (L.) DC. | queen coralbead | Menispermaceae
|
| COTR7 | Cocculus trilobus (Thunb.) DC. | Cocculus orbiculatus | Menispermaceae
|
| COVI7 | Cocculus virgatus Hbd. | Cocculus orbiculatus | Menispermaceae
|
| COCCU | Cocculus DC. | coralbead | Menispermaceae
|
| CORO6 | Cochiseia robbinsiorum W.H. Earle | Escobaria robbinsiorum | Cactaceae
|
| COFL4 | Cochleanthes flabelliformis (Sw.) R.E. Schultes & Garay | fanshape orchid | Orchidaceae
|
| COCHL2 | Cochleanthes Raf. | cochleanthes | Orchidaceae
|
| COAR10 | Cochlearia armoracia L. | Armoracia rusticana | Brassicaceae
|
| COGR6 | Cochlearia groenlandica L. | Danish scurvygrass | Brassicaceae
|
| COOFA | Cochlearia officinalis L. ssp. arctica (Schlecht.) Hult�n | Cochlearia groenlandica | Brassicaceae
|
| COOFG | Cochlearia officinalis L. ssp. groenlandica (L.) Porsild | Cochlearia groenlandica | Brassicaceae
|
| COOFO | Cochlearia officinalis L. ssp. oblongifolia (DC.) Hult�n | Cochlearia groenlandica | Brassicaceae
|
| COOFA2 | Cochlearia officinalis L. var. arctica (Schlecht.) Gelert ex Anders. & Hessel | Cochlearia groenlandica | Brassicaceae
|
| COOFS | Cochlearia officinalis L. var. sessilifolia (Rollins) Welsh | Cochlearia sessilifolia | Brassicaceae
|
| COSE8 | Cochlearia sessilifolia Rollins | sessileleaf scurvygrass | Brassicaceae
|
| COCHL4 | Cochlearia L. | scurvygrass | Brassicaceae
|
| COGRA | Cochleariopsis groenlandica (L.) A.& D. L�ve ssp. arctica (Schlecht.) A.& D. L�ve | Cochlearia groenlandica | Brassicaceae
|
| COGRO | Cochleariopsis groenlandica (L.) A.& D. L�ve ssp. oblongifolia (DC.) A.& D. L�ve | Cochlearia groenlandica | Brassicaceae
|
| COGR11 | Cochleariopsis groenlandica (L.) A.& D. L�ve | Cochlearia groenlandica | Brassicaceae
|
| COJU | Cochlidium jungens Bishop | mountain snailfern | Grammitidaceae
|
| COMI8 | Cochlidium minus (Jenman) Maxon | Cochlidium jungens | Grammitidaceae
|
| CORO4 | Cochlidium rostratum (Hook.) Maxon ex C. Christens. | beaked snailfern | Grammitidaceae
|
| COSE6 | Cochlidium seminudum (Willd.) Maxon | tree snailfern | Grammitidaceae
|
| COSE7 | Cochlidium serrulatum (Sw.) Bishop | toothed snailfern | Grammitidaceae
|
| COCHL | Cochlidium Kaulfuss | snailfern | Grammitidaceae
|
| CORE11 | Cochlospermum religiosum (L.) Alston | silk-cotton tree | Bixaceae
|
| COVI | Cochlospermum vitifolium (Willd.) Willd. ex Spreng. | silk cottontree | Bixaceae
|
| COCHL5 | Cochlospermum Kunth | cochlospermum | Bixaceae
|
| COAN13 | Cochranea anchusifolia (Poir.) Guerke | Heliotropium amplexicaule | Boraginaceae
|
| COCO17 | Cockerellia cockerellii (Britt.) A.& D. L�ve | Sedum cockerellii | Crassulaceae
|
| CONI7 | Cockerellia nivea (A. Davids.) A.& D. L�ve | Sedum niveum | Crassulaceae
|
| COCO29 | Cocos coronata C. Martius | Syagrus coronata | Arecaceae
|
| CONU | Cocos nucifera L. | coconut palm | Arecaceae
|
| COCOS | Cocos L. | coconut palm | Arecaceae
|
| COGY | Codariocalyx gyroides (Roxb. ex Link) Hassk. | false tick trefoil | Fabaceae
|
| CODAR | Codariocalyx Hassk. | tick trefoil | Fabaceae
|
| COVAP | Codiaeum variegatum (L.) A. Juss. var. pictum (Lodd.) Muell. Arg. | Codiaeum variegatum | Euphorbiaceae
|
| COVA3 | Codiaeum variegatum (L.) Juss. | garden croton | Euphorbiaceae
|
| CODIA | Codiaeum Juss. | codiaeum | Euphorbiaceae
|
| COTR6 | Coelia triptera auct. non (Sm.) G. Don ex Steud. | Encyclia pygmaea | Orchidaceae
|
| COAC60 | Coelocaulon aculeatum (Schreber) Link | Cetraria aculeata | Parmeliaceae
|
| CODI14 | Coelocaulon divergens (Ach.) R. Howe | Bryocaulon divergens | Parmeliaceae
|
| COMU60 | Coelocaulon muricatum (Ach.) J. R. Laundon | Cetraria muricata | Parmeliaceae
|
| COOD3 | Coelocaulon odontellum (Ach.) R. Howe | Cetraria odontella | Parmeliaceae
|
| COAM7 | Coelococcus amicarum (H. A. Wendl.) W. Wight | Metroxylon amicarum | Arecaceae
|
| COBR3 | Coeloglossum bracteatum (Muhl. ex Willd.) Parl. | Coeloglossum viride var. virescens | Orchidaceae
|
| COVIB3 | Coeloglossum viride (L.) Hartman ssp. bracteatum (Muhl. ex Willd.) Hult�n | Coeloglossum viride var. virescens | Orchidaceae
|
| COVII | Coeloglossum viride (L.) Hartman var. islandicum (Lindl.) Schulze | Coeloglossum viride var. viride | Orchidaceae
|
| COVIV | Coeloglossum viride (L.) Hartman var. virescens (Muhl. ex Willd.) Luer | longbract frog orchid | Orchidaceae
|
| COVIV2 | Coeloglossum viride (L.) Hartman var. viride | longbract frog orchid | Orchidaceae
|
| COVI6 | Coeloglossum viride (L.) Hartman | longbract frog orchid | Orchidaceae
|
| COELO2 | Coeloglossum Hartman | frog orchid | Orchidaceae
|
| COAU5 | Coelophragmus auriculatus (Gray) O.E. Schulz | Sisymbrium auriculatum | Brassicaceae
|
| COAC5 | Coelopleurum actaeifolium (Michx.) Coult. & Rose | Angelica lucida | Apiaceae
|
| COGM2 | Coelopleurum gmelinii (DC.) Ledeb. | Angelica lucida | Apiaceae
|
| COLUG | Coelopleurum lucidum (L.) Fern. ssp. gmelinii (DC.) A.& D. L�ve | Angelica lucida | Apiaceae
|
| COLU2 | Coelopleurum lucidum (L.) Fern. | Angelica lucida | Apiaceae
|
| COCY | Coelorachis cylindrica (Michx.) Nash | cylinder jointtail grass | Poaceae
|
| CORU3 | Coelorachis rugosa (Nutt.) Nash | wrinkled jointtail grass | Poaceae
|
| COTE5 | Coelorachis tessellata (Steud.) Nash | checkered jointtail grass | Poaceae
|
| COTU | Coelorachis tuberculosa (Nash) Nash | bumpy jointtail grass | Poaceae
|
| COELO | Coelorachis Brongn. | jointtail grass | Poaceae
|
| COLO3 | Coelostylis loganioides Torr. & Gray ex Endl. & Fenzl | Spigelia loganioides | Loganiaceae
|
| CODI12 | Coenogonium disjunctum Nyl. | | Gyalectaceae
|
| COIM | Coenogonium implexum Nyl. | | Gyalectaceae
|
| COIN10 | Coenogonium interplexum Nyl. | | Gyalectaceae
|
| COIN11 | Coenogonium interpositum Nyl. | | Gyalectaceae
|
| COLI13 | Coenogonium linkii Ehrenb. | Link's coenogonium lichen | Gyalectaceae
|
| COMI14 | Coenogonium missouriense J. Davis | | Gyalectaceae
|
| COMO5 | Coenogonium moniliforme Tuck. | | Gyalectaceae
|
| COENO | Coenogonium Ehrenb. | coenogonium | Gyalectaceae
|
| COAR2 | Coffea arabica L. | Arabian coffee | Rubiaceae
|
| COBE6 | Coffea benghalensis Heyne ex Schultes | bengal coffee | Rubiaceae
|
| COCA39 | Coffea canephora Pierre ex Froehner | robusta coffee | Rubiaceae
|
| COCO27 | Coffea congensis Froehner | congo coffee | Rubiaceae
|
| CODE11 | Coffea dewevrei Wildm. & T. Dur. | Coffea liberica | Rubiaceae
|
| COEX | Coffea excelsa A. Chev. | Coffea liberica | Rubiaceae
|
| COLI8 | Coffea liberica Bull ex Hiern. | Liberian coffee | Rubiaceae
|
| CORO8 | Coffea robusta L. Linden | Coffea canephora | Rubiaceae
|
| COST17 | Coffea stenophylla G. Don | coffea | Rubiaceae
|
| COFFE | Coffea L. | coffee | Rubiaceae
|
| CODA4 | Cogswellia daucifolia (Torr. & Gray) M.E. Jones | Lomatium foeniculaceum ssp. daucifolium | Apiaceae
|
| COFO5 | Cogswellia foeniculacea (Nutt.) Coult. & Rose | Lomatium foeniculaceum ssp. foeniculaceum | Apiaceae
|
| COMA12 | Cogswellia macrocarpa (Nutt. ex Torr. & Gray) M.E. Jones | Lomatium macrocarpum | Apiaceae
|
| COMA11 | Cogswellia marginata (Benth.) M.E. Jones | Lomatium marginatum var. marginatum | Apiaceae
|
| CONU9 | Cogswellia nudicaulis (Pursh) M.E. Jones | Lomatium nudicaule | Apiaceae
|
| COOR8 | Cogswellia orientalis (Coult. & Rose) M.E. Jones | Lomatium orientale | Apiaceae
|
| COVI12 | Cogswellia villosa (Raf.) J.A. Schultes | Lomatium foeniculaceum ssp. foeniculaceum | Apiaceae
|
| COCH4 | Coincya cheiranthos (Vill.) Greuter & Burdet | Coincya monensis ssp. recurvata | Brassicaceae
|
| COMOR | Coincya monensis (L.) Greuter & Burdet ssp. recurvata (All.) Leadley | star-mustard | Brassicaceae
|
| COMO9 | Coincya monensis (L.) Greuter & Burdet | star-mustard | Brassicaceae
|
| COINC | Coincya Rouy | star-mustard | Brassicaceae
|
| CODA3 | Coix dactyloides L. | Tripsacum dactyloides | Poaceae
|
| COLA | Coix lacryma-jobi L. | Job's tears | Poaceae
|
| COIX | Coix L. | Job's tears | Poaceae
|
| COAR9 | Cojoba arborea (L.) Britt. & Rose | wild tamarind | Fabaceae
|
| COJOB | Cojoba Britt. & Rose | cojoba | Fabaceae
|
| COAC4 | Cola acuminata (P. Beauv.) Schott & Endl. | abata cola | Sterculiaceae
|
| COAN14 | Cola anomala Schumann | anomalous cola | Sterculiaceae
|