| Croton glandulosus var. warmingii Müll. Arg., 1873 |
| Croton gomezii G.L. Webster, 2005 |
| Croton gonzalezii Greenm., 1903 |
| Croton gossypiifolius Vahl, 1791 |
| Croton gossypiifolius var. genuinus Müll. Arg., 1865 |
| Croton gossypiifolius var. heterophyllus (Kunth) Müll. Arg., 1865 |
| Croton gossypiifolius var. hibiscifolius (Kunth ex Spreng.) Müll. Arg., 1865 |
| Croton gossypiifolius var. stipularis Müll. Arg., 1865 |
| Croton gracilis Kunth, 1817 |
| Croton gracilis var. genuinus Müll. Arg., 1866 |
| Croton gracilis var. longiradiatus Müll. Arg., 1866 |
| Croton grewiifolius Müll. Arg., 1865 |
| Croton guatemalensis Lotsy, 1895 |
| Croton guerreroanus Mart. Gord. & Cruz Durán, 2011 |
| Croton gynopetalus Croizat, 1945 |
| Croton heptalon (Kuntze) B.W. van Ee & P.E. Berry, 2010 |
| Croton herbaceus Vell., 1831 |
| Croton hirtus L'Hér., 1785 |
| Croton hoffmannii Müll. Arg., 1865 |
| Croton hoffmannii var. viridis Müll. Arg., 1865 |