| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| COPA33 | Cola pachycarpa Schumann | cola | Sterculiaceae
|
| COVE10 | Cola verticillata (Thonn.) Stapf ex A. Chev. | cola | Sterculiaceae
|
| COLA15 | Cola Schott & Endl. | cola | Sterculiaceae
|
| COAU4 | Colchicum autumnale L. | autumn crocus | Liliaceae
|
| COSP12 | Colchicum speciosum Steven | showy colchicum | Liliaceae
|
| COLCH | Colchicum L. | colchicum | Liliaceae
|
| COCAP | Coldenia canescens DC. var. pulchella I.M. Johnston | Tiquilia canescens var. pulchella | Boraginaceae
|
| COCAS | Coldenia canescens DC. var. subnuda I.M. Johnston | Tiquilia canescens var. canescens | Boraginaceae
|
| COCA2 | Coldenia canescens DC. | Tiquilia canescens var. canescens | Boraginaceae
|
| COGO | Coldenia gossypina (Woot. & Standl.) I.M. Johnston | Tiquilia gossypina | Boraginaceae
|
| COGR | Coldenia greggii (Torr. & Gray) Gray | Tiquilia greggii | Boraginaceae
|
| COHIL | Coldenia hispidissima (Torr. & Gray) Gray var. latior I.M. Johnston | Tiquilia latior | Boraginaceae
|
| COHI | Coldenia hispidissima (Torr. & Gray) Gray | Tiquilia hispidissima | Boraginaceae
|
| COMET | Coldenia mexicana S. Wats. var. tomentosa (S. Wats.) I.M. Johnston | Tiquilia mexicana | Boraginaceae
|
| COME | Coldenia mexicana S. Wats. | Tiquilia mexicana | Boraginaceae
|
| CONU2 | Coldenia nuttallii Hook. | Tiquilia nuttallii | Boraginaceae
|
| COPA | Coldenia palmeri Gray | Tiquilia palmeri | Boraginaceae
|
| COPL | Coldenia plicata (Torr.) Coville | Tiquilia plicata | Boraginaceae
|
| COSU | Coleanthus subtilis (Tratt.) Seidel | mossgrass | Poaceae
|
| COLEA | Coleanthus Seidel | mossgrass | Poaceae
|
| COFIA | Coleogeton filiformis (Pers.) D.H. Les & Haynes ssp. alpinus (Blytt) D.H. Les & Haynes | Stuckenia filiformis ssp. alpinus | Potamogetonaceae
|
| COFIO | Coleogeton filiformis (Pers.) D.H. Les & Haynes ssp. occidentalis (J.W. Robbins) D.H. Les & Haynes | Stuckenia filiformis ssp. occidentalis | Potamogetonaceae
|
| COFI6 | Coleogeton filiformis (Pers.) D.H. Les & Haynes | Stuckenia filiformis ssp. filiformis | Potamogetonaceae
|
| COPE9 | Coleogeton pectinatus (L.) D.H. Les & Haynes | Stuckenia pectinatus | Potamogetonaceae
|
| COVA9 | Coleogeton vaginatus (Turcz.) D.H. Les & Haynes | Stuckenia vaginatus | Potamogetonaceae
|
| CORA | Coleogyne ramosissima Torr. | blackbrush | Rosaceae
|
| COLEO | Coleogyne Torr. | coleogyne | Rosaceae
|
| COCO21 | Coleosanthus cordifolius (Ell.) Kuntze | Brickellia cordifolia | Asteraceae
|
| CODE5 | Coleosanthus desertorum (Coville) Coville | Brickellia desertorum | Asteraceae
|
| COGR14 | Coleosanthus grandiflorus (Hook.) Kuntze | Brickellia grandiflora | Asteraceae
|
| COVE8 | Coleosanthus venosus Woot. & Standl. | Brickellia venosa | Asteraceae
|
| COAM5 | Coleus amboinicus Lour. | Plectranthus amboinicus | Lamiaceae
|
| COBA10 | Coleus barbatus (Andrews) Benth. | coleus | Lamiaceae
|
| COBL | Coleus blumei Benth. | Coleus scutellarioides | Lamiaceae
|
| COES2 | Coleus esculentus (N. E. Br.) G. Taylor | Plectranthus esculentus | Lamiaceae
|
| COPA34 | Coleus parviflorus Benth. | Solenostemon rotundifolius | Lamiaceae
|
| COPU6 | Coleus pumilus Blanco | dwarf coleus | Lamiaceae
|
| CORO9 | Coleus rotundifolius (Poiret) A. Chev. & E. Perrot | Solenostemon rotundifolius | Lamiaceae
|
| COSC7 | Coleus scutellarioides (L.) Benth. | common coleus | Lamiaceae
|
| COTU6 | Coleus tuberosus (Blume) Benth. | Solenostemon rotundifolius | Lamiaceae
|
| COLEU | Coleus Lour. | coleus | Lamiaceae
|
| COAR8 | Collema arcticum Lynge | Collema ceraniscum | Collemataceae
|
| COAU9 | Collema auriculatum Hoffm. | Collema auriforme | Collemataceae
|
| COAU8 | Collema auriforme (With.) Coppins & J. R. Laundon | jelly lichen | Collemataceae
|
| COBA8 | Collema bachmanianum (Fink) Degel. | Bachman's jelly lichen | Collemataceae
|
| COCA34 | Collema callibotrys Tuck. | jelly lichen | Collemataceae
|
| COCAR | Collema callopismum Massal var. rhyparodes (Nyl.) Degel. | jelly lichen | Collemataceae
|
| COCA35 | Collema callopismum A. Massal. | jelly lichen | Collemataceae
|
| COCE | Collema ceraniscum Nyl. | jelly lichen | Collemataceae
|
| COCH6 | Collema cheileum (Ach.) Ach. | Collema crispum | Collemataceae
|
| COCO25 | Collema coccophorum Tuck. | jelly lichen | Collemataceae
|
| COCOC7 | Collema conglomeratum Hoffm. var. corynesporum (Malme) Degel. | jelly lichen | Collemataceae
|
| COCOC4 | Collema conglomeratum Hoffm. var. crassiusculum (Malme) Degel. | conglomerate jelly lichen | Collemataceae
|
| COCO26 | Collema conglomeratum Hoffm. | conglomerate jelly lichen | Collemataceae
|
| COCR6 | Collema crispum (Hudson) Weber ex F. H. Wigg. | jelly lichen | Collemataceae
|
| COCR9 | Collema cristatellum Tuck. | Collema tenax | Collemataceae
|
| COCRM | Collema cristatum (L.) F. H. Wigg. var. marginale (Hudson) Degel. | jelly lichen | Collemataceae
|
| COCR7 | Collema cristatum (L.) F. H. Wigg. | jelly lichen | Collemataceae
|
| COCU5 | Collema curtisporum Degel. | jelly lichen | Collemataceae
|
| COCY6 | Collema cyrtaspis Tuck. | Collema conglomeratum var. crassiusculum | Collemataceae
|
| CODI13 | Collema dichotomum (With.) Coppins & J. R. Laundon | forked jelly lichen | Collemataceae
|
| CODU2 | Collema dubium de Lesd. | Collema coccophorum | Collemataceae
|
| COFA4 | Collema fasciculare (L.) F. H. Wigg. | jelly lichen | Collemataceae
|
| COFA5 | Collema fayettense Fink | Collema pustulatum | Collemataceae
|
| COFE4 | Collema fecundum Degel. | fecund jelly lichen | Collemataceae
|
| COFL7 | Collema flaccidum (Ach.) Ach. | jelly lichen | Collemataceae
|
| COFL11 | Collema fluviatile (Hudson) Steudel | Collema dichotomum | Collemataceae
|
| COFR8 | Collema fragrans (Sm.) Ach. | jelly lichen | Collemataceae
|
| COFUL | Collema furfuraceum (Arnold) Du Rietz var. luzonense (Rasanen) Degel. | Luzon jelly lichen | Collemataceae
|
| COFU3 | Collema furfuraceum (Arnold) Du Rietz | jelly lichen | Collemataceae
|
| COFU5 | Collema furvum (Ach.) Ach. | Collema fuscovirens | Collemataceae
|
| COFU60 | Collema fuscovirens (With.) J. R. Laundon | jelly lichen | Collemataceae
|
| COGL15 | Collema glaucescens Hoffm. | Collema limosum | Collemataceae
|
| COGL14 | Collema glebulentum (Nyl. ex Crombie) Degel. | jelly lichen | Collemataceae
|
| COGR16 | Collema granosum auct. | Collema auriforme | Collemataceae
|
| COKA3 | Collema kauaiense H. Magn. | jelly lichen | Collemataceae
|
| COLA13 | Collema laciniatum Nyl. | Collema texanum | Collemataceae
|
| COLE6 | Collema leptaleum Tuck. | jelly lichen | Collemataceae
|
| COLE7 | Collema leucopeplum (Tuck.) A. Schneider | Collema pulchellum var. leucopeplum | Collemataceae
|
| COLI14 | Collema limosum (Ach.) Ach. | jelly lichen | Collemataceae
|
| COMI10 | Collema microphyllum Ach. | Collema fragrans | Collemataceae
|
| COMI11 | Collema microptychium Tuck. | Collema leptaleum | Collemataceae
|
| COMU61 | Collema multipartitum Sm. | jelly lichen | Collemataceae
|
| CONI8 | Collema nigrescens (Hudson) DC. | jelly lichen | Collemataceae
|
| CONO3 | Collema novomexicanum de Lesd. | Collema coccophorum | Collemataceae
|
| CONY2 | Collema nylanderianum Zahlbr. | Collema texanum | Collemataceae
|
| COOC8 | Collema occultatum Bagl. | occult jelly lichen | Collemataceae
|
| COOH | Collema ohioense (Fink) Zahlbr. | Collema conglomeratum | Collemataceae
|
| COPL3 | Collema plicatile (Ach.) Ach. | Leptogium plicatile | Collemataceae
|
| COPO6 | Collema polycarpon Hoffm. | jelly lichen | Collemataceae
|
| COPUL | Collema pulchellum Ach. var. leucopeplum (Tuck.) Degel. | jelly lichen | Collemataceae
|
| COPUS2 | Collema pulchellum Ach. var. subnigrescens (Mull. Arg.) Degel. | jelly lichen | Collemataceae
|
| COPU19 | Collema pulchellum Ach. | jelly lichen | Collemataceae
|
| COPU17 | Collema pulposum (Bernh.) Ach. | Collema tenax | Collemataceae
|
| COPU16 | Collema pustulatum Ach. | jelly lichen | Collemataceae
|
| COPY4 | Collema pycnocarpum Nyl. | Collema conglomeratum var. crassiusculum | Collemataceae
|
| CORY60 | Collema ryssoleum (Tuck.) A. Schneider | jelly lichen | Collemataceae
|
| COST16 | Collema stenophyllum Nyl. | Collema dichotomum | Collemataceae
|
| COSU11 | Collema subflaccidum Degel. | jelly lichen | Collemataceae
|
| COSU14 | Collema subfurfuraceum Degel. | Collema furfuraceum var. luzonense | Collemataceae
|
| COSU15 | Collema subfurvum sensu Degel. | Collema subflaccidum | Collemataceae
|