| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| CRCO9 | Croton cortesianus Kunth | Cortez's croton | Euphorbiaceae
|
| CRCO10 | Croton coryi Croizat | Cory's croton | Euphorbiaceae
|
| CRCO24 | Croton corymbulosus Engelm. | Croton pottsii var. pottsii | Euphorbiaceae
|
| CRDI6 | Croton dioicus Cav. | grassland croton | Euphorbiaceae
|
| CRDI8 | Croton discolor Willd. | lechecillo | Euphorbiaceae
|
| CREL3 | Croton elliottii Chapman | Elliott's croton | Euphorbiaceae
|
| CREL7 | Croton eluteria (L.) Sw. | cascarilla | Euphorbiaceae
|
| CRENA | Croton engelmannii Ferguson var. albinoides Ferguson | Croton capitatus var. lindheimeri | Euphorbiaceae
|
| CREN3 | Croton engelmannii Ferguson | Croton capitatus var. lindheimeri | Euphorbiaceae
|
| CRFE4 | Croton fergusonii Small | Croton glandulosus var. floridanus | Euphorbiaceae
|
| CRFI3 | Croton fishlockii Britt. | Fishlock's croton | Euphorbiaceae
|
| CRFLR | Croton flavens L. var. rigidus Muell.-Arg. | Croton rigidus | Euphorbiaceae
|
| CRFL14 | Croton floridanus Ferguson | Croton glandulosus var. floridanus | Euphorbiaceae
|
| CRFR | Croton fruticulosus Engelm. ex Torr. | bush croton | Euphorbiaceae
|
| CRGLA | Croton glandulosus L. var. angustifolius Muell.-Arg. | vente conmigo | Euphorbiaceae
|
| CRGLF | Croton glandulosus L. var. floridanus (Ferguson) R.W. Long | vente conmigo | Euphorbiaceae
|
| CRGLG | Croton glandulosus L. var. glandulosus | vente conmigo | Euphorbiaceae
|
| CRGLL | Croton glandulosus L. var. lindheimeri Muell.-Arg. | Lindheimer's croton | Euphorbiaceae
|
| CRGLP | Croton glandulosus L. var. pubentissimus Croizat | vente conmigo | Euphorbiaceae
|
| CRGLS | Croton glandulosus L. var. septentrionalis Muell.-Arg. | vente conmigo | Euphorbiaceae
|
| CRGLS2 | Croton glandulosus L. var. simpsonii Ferguson | Simpson's croton | Euphorbiaceae
|
| CRGL2 | Croton glandulosus L. | vente conmigo | Euphorbiaceae
|
| CRHE4 | Croton heterocarpus Muell. Arg. | croton | Euphorbiaceae
|
| CRHU | Croton humilis L. | pepperbush | Euphorbiaceae
|
| CRIM3 | Croton impressus Urban | Puerto Rico croton | Euphorbiaceae
|
| CRIN13 | Croton incanus Kunth | Torrey's croton | Euphorbiaceae
|
| CRLE3 | Croton leucophyllus Muell.-Arg. | twocolor croton | Euphorbiaceae
|
| CRLI10 | Croton lindheimeri (Engelm. & Gray) Engelm. & Gray ex Wood | Croton capitatus var. lindheimeri | Euphorbiaceae
|
| CRLIL | Croton lindheimerianus Scheele var. lindheimerianus | threeseed croton | Euphorbiaceae
|
| CRLIT | Croton lindheimerianus Scheele var. tharpii M.C. Johnston | Tharp's croton | Euphorbiaceae
|
| CRLI2 | Croton lindheimerianus Scheele | threeseed croton | Euphorbiaceae
|
| CRLI4 | Croton linearis Jacq. | grannybush | Euphorbiaceae
|
| CRLO5 | Croton lobatus L. | lobed croton | Euphorbiaceae
|
| CRLO8 | Croton longipes M.E. Jones | Croton californicus var. californicus | Euphorbiaceae
|
| CRLU2 | Croton lucidus L. | firebush | Euphorbiaceae
|
| CRMI8 | Croton michauxii G.L. Webster | Michaux's croton | Euphorbiaceae
|
| CRMI17 | Croton microcarpus Ham. | money croton | Euphorbiaceae
|
| CRMI6 | Croton miquelensis Ferguson | Croton trinitatis | Euphorbiaceae
|
| CRMO6 | Croton monanthogynus Michx. | prairie tea | Euphorbiaceae
|
| CRNU3 | Croton nummulariifolius A. Rich. | Croton microcarpus | Euphorbiaceae
|
| CROV | Croton ovalifolius Vahl | yerba | Euphorbiaceae
|
| CRPA17 | Croton palustris L. | Caperonia palustris | Euphorbiaceae
|
| CRPA5 | Croton parksii Croizat | Parks' croton | Euphorbiaceae
|
| CRPO4 | Croton poecilanthus Urban | sabinon | Euphorbiaceae
|
| CRPOP | Croton pottsii (Klotzsch) Muell.-Arg. var. pottsii | leatherweed | Euphorbiaceae
|
| CRPOT | Croton pottsii (Klotzsch) Muell.-Arg. var. thermophilus (M.C. Johnston) M.C. Johnston | leatherweed | Euphorbiaceae
|
| CRPO5 | Croton pottsii (Klotzsch) Muell.-Arg. | leatherweed | Euphorbiaceae
|
| CRPU6 | Croton punctatus Jacq. | gulf croton | Euphorbiaceae
|
| CRRI2 | Croton rigidus (Muell.-Arg.) Britt. | yellow balsam | Euphorbiaceae
|
| CRRI8 | Croton ripensis Kanehira & Hatusima | croton | Euphorbiaceae
|
| CRSA5 | Croton sancti-lazari Croizat | TransPecos croton | Euphorbiaceae
|
| CRSE7 | Croton sebiferum L. | Triadica sebifera | Euphorbiaceae
|
| CRSE11 | Croton setigerus Hook. | dove weed | Euphorbiaceae
|
| CRSO2 | Croton soliman Cham. & Schlecht. | Soliman's croton | Euphorbiaceae
|
| CRSO | Croton sonorae Torr. | Sonoran croton | Euphorbiaceae
|
| CRST6 | Croton stenophyllus Griseb. | West Indian croton | Euphorbiaceae
|
| CRSU7 | Croton suaveolens Torr. | scented croton | Euphorbiaceae
|
| CRTET | Croton texensis (Klotzsch) Muell.-Arg. var. texensis | Texas croton | Euphorbiaceae
|
| CRTEU | Croton texensis (Klotzsch) Muell.-Arg. var. utahensis Cronq. | Utah croton | Euphorbiaceae
|
| CRTE4 | Croton texensis (Klotzsch) Muell.-Arg. | Texas croton | Euphorbiaceae
|
| CRTI3 | Croton tiglium L. | purging croton | Euphorbiaceae
|
| CRTI4 | Croton tinctoria L. | Chrozophora tinctoria | Euphorbiaceae
|
| CRTO5 | Croton torreyanus auct. non Muell.-Arg. | Croton incanus | Euphorbiaceae
|
| CRTR8 | Croton trinitatis Millsp. | roadside croton | Euphorbiaceae
|
| CRWI2 | Croton wigginsii L.C. Wheeler | Wiggins' croton | Euphorbiaceae
|
| CRWI5 | Croton willdenowii G.L. Webster | Willdenow's croton | Euphorbiaceae
|
| CROTO | Croton L. | croton | Euphorbiaceae
|
| CREL2 | Crotonopsis elliptica Willd. | Croton willdenowii | Euphorbiaceae
|
| CRLI3 | Crotonopsis linearis Michx. | Croton michauxii | Euphorbiaceae
|
| CRAN11 | Crucianella angustifolia L. | narrowleaf crucianella | Rubiaceae
|
| CRUCI | Crucianella L. | crucianella | Rubiaceae
|
| CRLA13 | Cruciata laevipes Opiz | smooth bedstraw | Rubiaceae
|
| CRPE10 | Cruciata pedemontana (Bellardi) Ehrend. | piedmont bedstraw | Rubiaceae
|
| CRUCI2 | Cruciata P. Mill. | bedstraw | Rubiaceae
|
| CRCY | Crudia cynometroides Hosokawa | | Fabaceae
|
| CRUDI | Crudia Schreb. | | Fabaceae
|
| CRDE4 | Crumia deciduidentata Sharp & Iwats. | crumia moss | Pottiaceae
|
| CRLA10 | Crumia latifolia (Kindb. in Mac.) Schof. | wideleaf crumia moss | Pottiaceae
|
| CRUMI | Crumia Schof. | crumia moss | Pottiaceae
|
| CRCH10 | Crunocallis chamissoi (Ledeb. ex Spreng.) Rydb. | Montia chamissoi | Portulacaceae
|
| CRVU2 | Crupina vulgaris Cass. | common crupina | Asteraceae
|
| CRUPI | Crupina (Pers.) DC. | crupina | Asteraceae
|
| CRDI12 | Crusea diversifolia (Kunth) W.A. Anderson | mountain saucerflower | Rubiaceae
|
| CRSU8 | Crusea subulata (DC.) Gray | Crusea diversifolia | Rubiaceae
|
| CRTR9 | Crusea tricocca (Torr. & Gray) Heller | Richardia tricocca | Rubiaceae
|
| CRWR | Crusea wrightii Gray | Crusea diversifolia | Rubiaceae
|
| CRUSE | Crusea Cham. & Schlecht. | mountain saucerflower | Rubiaceae
|
| CRVE10 | Cruzeta vermicularis (L.) G. Maza | Blutaparon vermiculare | Amaranthaceae
|
| CRFI4 | Cryphaea filiformis (Hedw.) Brid. | filiform cryphaea moss | Cryphaeaceae
|
| CRFL18 | Cryphaea floridensis Crum | Cryphaea filiformis | Cryphaeaceae
|
| CRGLS3 | Cryphaea glomerata Bruch & Schimp. ex Sull. var. scabra Grout | Cryphaea filiformis | Cryphaeaceae
|
| CRGL12 | Cryphaea glomerata Bruch & Schimp. ex Sull. | cryphaea moss | Cryphaeaceae
|
| CRNE8 | Cryphaea nervosa (Hook. & Wils. in Drumm.) C. M�ll. | cryphaea moss | Cryphaeaceae
|
| CRRA7 | Cryphaea ravenelii Aust. | Ravenel's cryphaea moss | Cryphaeaceae
|
| CRYPH | Cryphaea Web. | cryphaea moss | Cryphaeaceae
|
| CRAC4 | Crypsis aculeata auct. non (L.) Ait. | Crypsis vaginiflora | Poaceae
|
| CRAL2 | Crypsis alopecuroides (Piller & Mitterp.) Schrad. | foxtail pricklegrass | Poaceae
|
| CRNI3 | Crypsis niliacea auct. non Fig. & de Not. | Crypsis vaginiflora | Poaceae
|
| CRSC | Crypsis schoenoides (L.) Lam. | swamp pricklegrass | Poaceae
|
| CRVA2 | Crypsis vaginiflora (Forsk.) Opiz | African pricklegrass | Poaceae
|
| CRYPS | Crypsis Ait. | pricklegrass | Poaceae
|