| Regno | Plantae |
| Sottoregno | Tracheobionta |
| Superdivisione | Spermatophyta |
| Divisione | Magnoliophyta |
| Classe | Magnoliopsida |
| Ordine | Saxifragales |
An order of eudicots including Crassulaceae (echeveria, crassula, sedum, kalanchoe), Saxifragaceae and Hamamelidaceae. The Crassulaceae are the most widespread leaf succulents and use CAM photosynthesis.