| Byttneria lateralis C. Presl, 1835 |
| Byttneria pescapriifolia Britton, 1889 |
| Byttnerieae DC., 1824 |
| Byttnerioideae Burnett, 1832 |
| Callianthe Donnell, 2012 |
| Callianthe jaliscana (Standl.) Donnell, 2012 |
| Callianthe pachecoana (Standl. & Steyerm.) Donnell, 2012 |
| Callianthe picta (Gillies ex Hook. & Arn.) Donnell, 2012 |
| Callianthe purpusii (Standl.) Donnell, 2012 |
| Callianthe tridens (Standl. & Steyerm.) Donnell, 2012 |
| Callirhoe Nutt., 1821 |
| Callirhoe involucrata (Torr. & A. Gray) A. Gray, 1849 |
| Callirhoe macrostegia Hochr., 1917 |
| Carolinea L. f., 1782 |
| Carolinea fastuosa DC., 1824 |
| Carpodiptera Griseb., 1860 |
| Carpodiptera ameliae Lundell, 1937 |
| Carpodiptera cubensis Griseb., 1860 |
| Carpodiptera mariarum Standl., 1944 |
| Ceiba Mill., 1754 |