| 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 |
| Crassuloideae Burnett, 1835 |
| Cremnophila Rose, 1905 |
| Cremnophila linguifolia (Lem.) Moran, 1975 |
| Cremnophila nutans (Rose) Rose, 1905 |
| Cremnophila tlahuicana J. Reyes, Avila & Brachet, 2015 |
| Diamorpha Nutt., 1818 |
| Dudleya Britton & Rose, 1903 |
| Dudleya abramsii Rose, 1903 |
| Dudleya acuminata Rose, 1903 |
| Dudleya albiflora Rose, 1903 |
| Dudleya anomala (Davidson) Moran, 1943 |
| Dudleya anthonyi Rose, 1903 |