| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| CRVET3 | Crepis vesicaria L. var. taraxacifolia (Thuill.) Boivin | Crepis vesicaria ssp. taraxacifolia | Asteraceae
|
| CRVE3 | Crepis vesicaria L. | beaked hawksbeard | Asteraceae
|
| CRZA2 | Crepis zacintha (L.) Babcock | striped hawksbeard | Asteraceae
|
| CREPI | Crepis L. | hawksbeard | Asteraceae
|
| CRAL11 | Crescentia alata Kunth | morrito | Bignoniaceae
|
| CRCU | Crescentia cujete L. | common calabash tree | Bignoniaceae
|
| CRLI5 | Crescentia linearifolia Miers | higuerito | Bignoniaceae
|
| CRPO6 | Crescentia portoricensis Britt. | higuero de sierra | Bignoniaceae
|
| CRESC | Crescentia L. | crescentia | Bignoniaceae
|
| CRCH14 | Cresponea chloroconia (Tuck.) Egea & Torrente | | Opegraphaceae
|
| CRFL21 | Cresponea flava (Vainio) Egea & Torrente | | Opegraphaceae
|
| CRLE17 | Cresponea leprieurii (Mont.) Egea & Torrente | | Opegraphaceae
|
| CRPRS | Cresponea premnea (Ach.) Egea & Torrente var. saxicola (Leighton) Egea & Torrente | | Opegraphaceae
|
| CRPR7 | Cresponea premnea (Ach.) Egea & Torrente | | Opegraphaceae
|
| CRPR8 | Cresponea proximata (Nyl.) Egea & Torrente | | Opegraphaceae
|
| CRESP | Cresponea Egea & Torrente | cresponea | Opegraphaceae
|
| CRDE8 | Cressa depressa Goodding | Cressa truxillensis | Convolvulaceae
|
| CRIN14 | Cressa insularis House | Cressa truxillensis | Convolvulaceae
|
| CRNU | Cressa nudicaulis Griseb. | nakedstem alkaliweed | Convolvulaceae
|
| CRTRM | Cressa truxillensis Kunth var. minima (Heller) Munz | Cressa truxillensis | Convolvulaceae
|
| CRTRV | Cressa truxillensis Kunth var. vallicola (Heller) Munz | Cressa truxillensis | Convolvulaceae
|
| CRTR5 | Cressa truxillensis Kunth | spreading alkaliweed | Convolvulaceae
|
| CRESS | Cressa L. | alkaliweed | Convolvulaceae
|
| CRAM2 | Crinum americanum L. | seven sisters | Liliaceae
|
| CRAS6 | Crinum asiaticum L. | poisonbulb | Liliaceae
|
| CRBU2 | Crinum bulbispermum (Burm. f.) Milne-Redhead & Schweickerdt | hardy swamplily | Liliaceae
|
| CRFL16 | Crinum floridanum Fraser ex Steud. | Crinum americanum | Liliaceae
|
| CRLAZ | Crinum latifolium L. var. zeylanicum (L.) Hook. f. | Crinum zeylanicum | Liliaceae
|
| CRLO | Crinum longifolium (L.) Thunb. | Crinum bulbispermum | Liliaceae
|
| CRMA23 | Crinum macowanii Baker | pyjama lily | Liliaceae
|
| CRSTT | Crinum strictum Herbert var. traubii Moldenke | Crinum americanum | Liliaceae
|
| CRST3 | Crinum strictum Herbert | Crinum americanum | Liliaceae
|
| CRZE | Crinum zeylanicum (L.) L. | Ceylon swamplily | Liliaceae
|
| CRINU | Crinum L. | swamplily | Liliaceae
|
| CRAR11 | Criosanthes arietina (Ait. f.) House | Cypripedium arietinum | Orchidaceae
|
| CRER4 | Cristatella erosa Nutt. | Polanisia erosa ssp. erosa | Capparaceae
|
| CRJA5 | Cristatella jamesii Torr. & Gray | Polanisia jamesii | Capparaceae
|
| CRAR12 | Critesion arizonicum (Covas) A. L�ve | Hordeum arizonicum | Poaceae
|
| CRBR12 | Critesion brachyantherum (Nevski) Barkworth & D.R. Dewey | Hordeum brachyantherum ssp. brachyantherum | Poaceae
|
| CRCA17 | Critesion californicum (Covas & Stebbins) A. L�ve | Hordeum brachyantherum ssp. californicum | Poaceae
|
| CRDE9 | Critesion depressum (Scribn. & J.G. Sm.) A. L�ve | Hordeum depressum | Poaceae
|
| CRGE4 | Critesion geniculatum (All.) A. L�ve | Hordeum marinum ssp. gussonianum | Poaceae
|
| CRGL13 | Critesion glaucum (Steud.) A. L�ve | Hordeum murinum ssp. glaucum | Poaceae
|
| CRHY2 | Critesion hystrix (Roth) A. L�ve | Hordeum marinum ssp. gussonianum | Poaceae
|
| CRJUB | Critesion jubatum (L.) Nevski ssp. breviaristatum (Bowden) A.& D. L�ve | Hordeum brachyantherum ssp. brachyantherum | Poaceae
|
| CRJU2 | Critesion jubatum (L.) Nevski | Hordeum jubatum ssp. jubatum | Poaceae
|
| CRMAG | Critesion marinum (Huds.) A. L�ve ssp. gussonianum (Parl.) Barkworth & D.R. Dewey | Hordeum marinum ssp. gussonianum | Poaceae
|
| CRMA20 | Critesion marinum (Huds.) A. L�ve | Hordeum marinum ssp. marinum | Poaceae
|
| CRMUG | Critesion murinum (L.) A. L�ve ssp. glaucum (Steud.) W.A. Weber | Hordeum murinum ssp. glaucum | Poaceae
|
| CRMUL | Critesion murinum (L.) A. L�ve ssp. leporinum (Link) A. L�ve | Hordeum murinum ssp. leporinum | Poaceae
|
| CRMU6 | Critesion murinum (L.) A. L�ve | Hordeum murinum ssp. murinum | Poaceae
|
| CRPU13 | Critesion pusillum (Nutt.) A. L�ve | Hordeum pusillum | Poaceae
|
| CRPO7 | Critonia portoricensis (Urban) Britt. & Wilson | Puerto Rico thoroughwort | Asteraceae
|
| CRITO2 | Critonia P. Br. | thoroughwort | Asteraceae
|
| CRAR4 | Crocanthemum arenicola (Chapman) Barnh. | Helianthemum arenicola | Cistaceae
|
| CRBI6 | Crocanthemum bicknellii (Fern.) Barnh. | Helianthemum bicknellii | Cistaceae
|
| CRCA15 | Crocanthemum canadense (L.) Britt. | Helianthemum canadense | Cistaceae
|
| CRCA16 | Crocanthemum carolinianum (Walt.) Spach | Helianthemum carolinianum | Cistaceae
|
| CRCO28 | Crocanthemum corymbosum (Michx.) Britt. | Helianthemum corymbosum | Cistaceae
|
| CRDU3 | Crocanthemum dumosum Bickn. | Helianthemum dumosum | Cistaceae
|
| CRGE3 | Crocanthemum georgianum (Chapman) Barnh. | Helianthemum georgianum | Cistaceae
|
| CRGL7 | Crocanthemum glomeratum (Lag.) Janchen | Helianthemum glomeratum | Cistaceae
|
| CRMA17 | Crocanthemum majus sensu Britt. | Helianthemum bicknellii | Cistaceae
|
| CRNA3 | Crocanthemum nashii (Britt.) Barnh. | Helianthemum nashii | Cistaceae
|
| CRPR6 | Crocanthemum propinquum (Bickn.) Bickn. | Helianthemum propinquum | Cistaceae
|
| CRRO10 | Crocanthemum rosmarinifolium (Pursh) Janchen | Helianthemum rosmarinifolium | Cistaceae
|
| CRTH2 | Crocanthemum thyrsoideum (Barnh.) Janchen | Helianthemum nashii | Cistaceae
|
| CRMU | Crocidium multicaule Hook. | common spring-gold | Asteraceae
|
| CROCI | Crocidium Hook. | spring-gold | Asteraceae
|
| CRCH9 | Crockeria chrysantha Greene ex Gray | Lasthenia chrysantha | Asteraceae
|
| CRCR6 | Crocosmia �crocosmiiflora (V. Lemoine) N.E. Br. | montbretia | Iridaceae
|
| CROCO | Crocosmia Planch. | crocosmia | Iridaceae
|
| CRAN5 | Crocus angustifolius Weston | cloth of gold | Iridaceae
|
| CRFL7 | Crocus flavus Weston | yellow crocus | Iridaceae
|
| CRIM4 | Crocus imperati Ten. | early crocus | Iridaceae
|
| CRMA19 | Crocus maesiacus Ker-Gawl. | Crocus flavus | Iridaceae
|
| CRSI6 | Crocus sieberi J. Gay | Sieber's crocus | Iridaceae
|
| CRSU10 | Crocus susianus Ker-Gawl. | Crocus angustifolius | Iridaceae
|
| CRVEN | Crocus vernus (L.) Hill var. neapolitanus Ker-Gawl. | Crocus vernus | Iridaceae
|
| CRVE4 | Crocus vernus (L.) Hill | dutch crocus | Iridaceae
|
| CRVE9 | Crocus vernus P. Mill. | Crocus angustifolius | Iridaceae
|
| CROCU | Crocus L. | crocus | Iridaceae
|
| CRAL10 | Crocynia aliciae Hue | Lepraria lobificans | Uncertain Lichen Family
|
| CRAM11 | Crocynia americana de Lesd. | Lepraria lobificans | Uncertain Lichen Family
|
| CRGO2 | Crocynia gossypina (Sw.) A. Massal. | | Crocyniaceae
|
| CRNE7 | Crocynia neglecta (Nyl.) Hue | Lepraria neglecta | Uncertain Lichen Family
|
| CRPY3 | Crocynia pyxinoides Nyl. | | Crocyniaceae
|
| CROCY | Crocynia (Ach.) A. Massal. | crocynia | Crocyniaceae
|
| CRPA18 | Croftia parvifolia (Torr.) Small | Carlowrightia torreyana | Acanthaceae
|
| CRMI15 | Crookea microsepala (Torr. & Gray) Small | Hypericum microsepalum | Clusiaceae
|
| CRPA9 | Croomia pauciflora (Nutt.) Torr. | croomia | Stemonaceae
|
| CROOM | Croomia Torr. | croomia | Stemonaceae
|
| CRDIG | Croptilon divaricatum (Nutt.) Raf. var. graniticum (E.B. Sm.) Shinners | Croptilon hookerianum var. graniticum | Asteraceae
|
| CRDIH2 | Croptilon divaricatum (Nutt.) Raf. var. hirtellum (Shinners) Shinners | Croptilon rigidifolium | Asteraceae
|
| CRDIH | Croptilon divaricatum (Nutt.) Raf. var. hookerianum (Torr. & Gray) Shinners | Croptilon hookerianum var. hookerianum | Asteraceae
|
| CRDI17 | Croptilon divaricatum (Nutt.) Raf. | slender scratchdaisy | Asteraceae
|
| CRHOG | Croptilon hookerianum (Torr. & Gray) House var. graniticum (E.B. Sm.) E.B. Sm. | Hooker's scratchdaisy | Asteraceae
|
| CRHOH | Croptilon hookerianum (Torr. & Gray) House var. hookerianum | Hooker's scratchdaisy | Asteraceae
|
| CRHOV | Croptilon hookerianum (Torr. & Gray) House var. validum (Rydb.) E.B. Sm. | Hooker's scratchdaisy | Asteraceae
|
| CRHO7 | Croptilon hookerianum (Torr. & Gray) House | Hooker's scratchdaisy | Asteraceae
|
| CRRI3 | Croptilon rigidifolium (E.B. Sm.) E.B. Sm. | stiffleaf scratchdaisy | Asteraceae
|