| Croton boregensis M.E. Jones, 1933 |
| Croton botryocarpus Croizat, 1942 |
| Croton breedlovei B.W. van Ee & P.E. Berry, 2011 |
| Croton caboensis Croizat, 1945 |
| Croton calcareus Mateo-Ram. & Riina, 2020 |
| Croton californicus Müll. Arg., 1866 |
| Croton californicus var. longipes (M.E. Jones) A.M. Ferguson, 1901 |
| Croton californicus var. major S. Watson, 1880 |
| Croton californicus var. mohavensis A.M. Ferguson, 1901 |
| Croton californicus var. tenuis (S. Watson) A.M. Ferguson, 1901 |
| Croton callistanthus Croizat, 1940 |
| Croton calvescens S. Watson, 1891 |
| Croton campechianus Standl., 1935 |
| Croton capitatus Michx., 1803 |
| Croton capitatus var. albinoides (A.M. Ferguson) Shinners, 1951 |
| Croton capitatus var. genuinus Müll. Arg., 1866 |
| Croton carpostellatus B.L. León & Mart. Gord., 2008 |
| Croton castaneifolius L., 1753 |
| Croton chaetodus Urb., 1908 |
| Croton chamaedrifolius (Klotzsch) Griseb., 1859 |