| Cotyledon coccinea Cav., 1793 |
| Cotyledon gibbiflora (Moc. & Sessé ex DC.) Baker, 1869 |
| Cotyledon jurgensenii Hemsl., 1878 |
| Cotyledon mucronata (Schltdl.) Baker, 1869 |
| Cotyledon parviflora Hemsl., 1878 |
| Cotyledon pinnata Lam., 1786 |
| Cotyledon subrigida B.L. Rob. & Seaton, 1893 |
| Crassula L., 1753 |
| Crassula aquatica (L.) Schönland, 1890 |
| Crassula closiana (Gay) Reiche, 1897 |
| Crassula connata (Ruiz & Pav.) Berger, 1930 |
| Crassula connata var. eremica (Jeps.) M. Bywater & Wickens, 1984 |
| Crassula drummondii (Torr. & A. Gray) Fedde, 1904 |
| Crassula longipes (Rose) M. Bywater & Wickens, 1983 |
| Crassula ovata (Mill.) Druce, 1917 |
| Crassula saginoides (Maxim.) M. Bywater & Wickens, 1983 |
| Crassula solieri (Gay) F. Meigen, 1893 |
| Crassula viridis (S. Watson) M. Bywater & Wickens, 1984 |
| Crassula viridis (S. Watson) Fedde, 1904 |
| Crassulaceae J. St.-Hil., 1805 |