| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| CLTE3 | Clitoria ternatea L. | Asian pigeonwings | Fabaceae
|
| CLITO | Clitoria L. | pigeonwings | Fabaceae
|
| CLMI11 | Clivia minata (Lindl.) Regel | Kaffir-lily | Liliaceae
|
| CLIVI | Clivia Lindl. | Kaffir-lily | Liliaceae
|
| CLCL2 | Clusia clusioides (Griseb.) D'Arcy | cupeillo | Clusiaceae
|
| CLGR2 | Clusia grisebachiana (Planch. & Triana) Alain | Clusia clusioides | Clusiaceae
|
| CLGU | Clusia gundlachii Stahl | Grundlach's attorney | Clusiaceae
|
| CLKR2 | Clusia krugiana Urban | Clusia clusioides | Clusiaceae
|
| CLMI2 | Clusia minor L. | cupey de monte | Clusiaceae
|
| CLRO | Clusia rosea Jacq. | scotch attorney | Clusiaceae
|
| CLUSI | Clusia L. | attorney | Clusiaceae
|
| CLWA4 | Clylismia walkeri A. Nels. | Camissonia walkeri ssp. walkeri | Onagraceae
|
| CLGR10 | Clypeococcum grossum (Korber) D. Hawksw. | | Dacampiaceae
|
| CLHY2 | Clypeococcum hypocenomycis D. Hawksw. | | Dacampiaceae
|
| CLYPE | Clypeococcum D. Hawksw. | clypeococcum | Dacampiaceae
|
| CLAL10 | Clypeola alyssoides L. | Alyssum alyssoides | Brassicaceae
|
| CLMA6 | Clypeola maritima L. | Lobularia maritima | Brassicaceae
|
| CLMI5 | Clypeola minus L. p.p. | Alyssum minus var. micranthum | Brassicaceae
|
| CNHO | Cnemidaria horrida (L.) K. Presl | deepwoods fern | Cyatheaceae
|
| CNEMI | Cnemidaria K. Presl | cnemidaria | Cyatheaceae
|
| CNKN | Cnemidophacos knowlesianus Rydb. | Astragalus hoodianus | Fabaceae
|
| CNPE | Cnemidophacos pectinatus (Hook.) Rydb. | Astragalus pectinatus | Fabaceae
|
| CNDU | Cneoridium dumosum (Nutt.) Hook. f. ex Baill. | bush rue | Rutaceae
|
| CNEOR | Cneoridium Hook. f. | cneoridium | Rutaceae
|
| CNAL | Cnestrum alpestre (Wahlenb.) Nyh. ex Mog. | Cynodontium alpestre | Dicranaceae
|
| CNGL | Cnestrum glaucescens (Lindb. & Arnell) Holm. ex Mog. & Steere | Cynodontium glaucescens | Dicranaceae
|
| CNSC | Cnestrum schisti (Web. & Mohr) Hag. | Cynodontium schisti | Dicranaceae
|
| CNEST | Cnestrum I. Hag. | cnestrum | Dicranaceae
|
| CNAM | Cnicus amplifolius Greene | Cirsium andrewsii | Asteraceae
|
| CNAR | Cnicus arizonicus Gray | Cirsium arizonicum var. arizonicum | Asteraceae
|
| CNBE | Cnicus benedictus L. | blessed thistle | Asteraceae
|
| CNBRV | Cnicus breweri Gray var. vaseyi Gray | Cirsium hydrophilum var. vaseyi | Asteraceae
|
| CNCA | Cnicus calcareus M.E. Jones | Cirsium calcareum | Asteraceae
|
| CNDRA | Cnicus drummondii (Torr. & Gray) Gray var. acaulescens Rydb. | Cirsium tioganum var. tioganum | Asteraceae
|
| CNOC | Cnicus ochrocentrus (Gray) Gray | Cirsium ochrocentrum | Asteraceae
|
| CNPA | Cnicus parryi Gray | Cirsium parryi ssp. parryi | Asteraceae
|
| CNTI | Cnicus tioganus Congd. | Cirsium tioganum var. tioganum | Asteraceae
|
| CNUNM | Cnicus undulatus Gray var. megacephalus Gray | Cirsium undulatum var. undulatum | Asteraceae
|
| CNWH | Cnicus wheeleri Gray | Cirsium wheeleri | Asteraceae
|
| CNICU | Cnicus L. | cnicus | Asteraceae
|
| CNAJ2 | Cnidium ajanense (Regel & Tiling) Drude | Tilingia ajanensis | Apiaceae
|
| CNCN | Cnidium cnidiifolium (Turcz.) Schischkin | Jakutsk snowparsley | Apiaceae
|
| CNMO | Cnidium monnieri (L.) Cusson ex Juss. | Monnier's snowparsley | Apiaceae
|
| CNIDI | Cnidium Cusson ex Juss. | snowparsley | Apiaceae
|
| CNAC | Cnidoscolus aconitifolius (P. Mill.) I.M. Johnston | treadsoftly | Euphorbiaceae
|
| CNAN | Cnidoscolus angustidens Torr. | mala mujer | Euphorbiaceae
|
| CNCH | Cnidoscolus chayamansa McVaugh | chaya | Euphorbiaceae
|
| CNST | Cnidoscolus stimulosus (Michx.) Engelm. & Gray | finger rot | Euphorbiaceae
|
| CNTE | Cnidoscolus texanus (Muell.-Arg.) Small | Texas bullnettle | Euphorbiaceae
|
| CNUR | Cnidoscolus urens (L.) Arthur | cnidoscolus | Euphorbiaceae
|
| CNIDO | Cnidoscolus Pohl | cnidoscolus | Euphorbiaceae
|
| COCO18 | Coccinia cordifolia auct. non (L.) Cogn. | Coccinia grandis | Cucurbitaceae
|
| COGR9 | Coccinia grandis (L.) Voigt | ivy gourd | Cucurbitaceae
|
| COIN14 | Coccinia indica Wight & Arn. | Coccinia grandis | Cucurbitaceae
|
| COCCI | Coccinia Wight & Arn. | coccinia | Cucurbitaceae
|
| COAS5 | Coccocarpia asterella (Nyl.) Vainio | Coccocarpia stellata | Coccocarpiaceae
|
| COCR8 | Coccocarpia cronia (Tuck.) Vainio | Coccocarpia palmicola | Coccocarpiaceae
|
| CODO3 | Coccocarpia domingensis Vainio | | Coccocarpiaceae
|
| COER8 | Coccocarpia erythroxyli (Sprengel) Swinscow & Krog | | Coccocarpiaceae
|
| COIN12 | Coccocarpia incisa Pers. | Coccocarpia erythroxyli | Coccocarpiaceae
|
| COPA29 | Coccocarpia palmicola (Sprengel) Arv. & D. J. Galloway | | Coccocarpiaceae
|
| COPA30 | Coccocarpia parmelioides (Hook.) Tuck. ex M. A. Curtis | Coccocarpia erythroxyli | Coccocarpiaceae
|
| COST15 | Coccocarpia stellata Tuck. | | Coccocarpiaceae
|
| COCCO4 | Coccocarpia Pers. | coccocarpia | Coccocarpiaceae
|
| COHE6 | Coccocypselum herbaceum P. Br. | yerba de guava | Rubiaceae
|
| COCCO3 | Coccocypselum P. Br. | coccocypselum | Rubiaceae
|
| COBO4 | Coccoloba borinquensis Britt. | Coccoloba swartzii | Polygonaceae
|
| COCO8 | Coccoloba costata C. Wright ex Sauvalle | uvilla | Polygonaceae
|
| CODI8 | Coccoloba diversifolia Jacq. | tietongue | Polygonaceae
|
| COFL12 | Coccoloba floridana Meissn. | Coccoloba diversifolia | Polygonaceae
|
| COGR12 | Coccoloba grandifolia Jacq. | Coccoloba pubescens | Polygonaceae
|
| COKR | Coccoloba krugii Lindau | whitewood | Polygonaceae
|
| COLA10 | Coccoloba laurifolia auct. non Jacq. | Coccoloba diversifolia | Polygonaceae
|
| COMI | Coccoloba microstachya Willd. | puckhout | Polygonaceae
|
| COOB5 | Coccoloba obtusifolia auct. non Jacq. | Coccoloba microstachya | Polygonaceae
|
| COPA24 | Coccoloba pallida C. Wright | pale seagrape | Polygonaceae
|
| COPU | Coccoloba pubescens L. | grandleaf seagrape | Polygonaceae
|
| COPY | Coccoloba pyrifolia Desf. | uvera | Polygonaceae
|
| CORU4 | Coccoloba rugosa Desf. | ortegon | Polygonaceae
|
| CORU10 | Coccoloba rupicola Urban | Coccoloba costata | Polygonaceae
|
| COSI2 | Coccoloba sintenisii Urban ex Lindau | uvero de monte | Polygonaceae
|
| COSWP | Coccoloba swartzii Meisn. var. portoricensis Meisn. | Coccoloba swartzii | Polygonaceae
|
| COSW | Coccoloba swartzii Meisn. | Swartz's pigeonplum | Polygonaceae
|
| COTE9 | Coccoloba tenuifolia L. | Bahama pigeonplum | Polygonaceae
|
| COUV | Coccoloba uvifera (L.) L. | seagrape | Polygonaceae
|
| COVE | Coccoloba venosa L. | false chiggergrape | Polygonaceae
|
| COCCO | Coccoloba P. Br. | coccoloba | Polygonaceae
|
| COAL3 | Coccothrinax alta (O.F. Cook) Becc. | Coccothrinax barbadensis | Arecaceae
|
| COAR | Coccothrinax argentata (Jacq.) Bailey | Florida silver palm | Arecaceae
|
| COBA3 | Coccothrinax barbadensis (Lodd. ex Mart.) Becc. | Puerto Rico silver palm | Arecaceae
|
| CODI7 | Coccothrinax discreta Bailey | Coccothrinax barbadensis | Arecaceae
|
| COEGS | Coccothrinax eggersiana Becc. var. sanctae-crucis Becc. | Coccothrinax barbadensis | Arecaceae
|
| COEG | Coccothrinax eggersiana Becc. | Coccothrinax barbadensis | Arecaceae
|
| COGA | Coccothrinax garberi (Chapman) Sarg. | Coccothrinax argentata | Arecaceae
|
| COSA2 | Coccothrinax sanctae-thomasae Becc. | Coccothrinax barbadensis | Arecaceae
|
| COCCO2 | Coccothrinax Sarg. | silver palm | Arecaceae
|
| COMA15 | Coccotrema maritimum Brodo | | Coccotremataceae
|
| COPO5 | Coccotrema pocillarium (Cummings) Brodo | | Coccotremataceae
|
| COCCO5 | Coccotrema Mull. Arg. | coccotrema | Coccotremataceae
|
| COCA | Cocculus carolinus (L.) DC. | Carolina coralbead | Menispermaceae
|
| CODI | Cocculus diversifolius DC. | snailseed | Menispermaceae
|