Families
Saxifragales contains about 2470 species. These are distributed into 15 families, or into 12 families if Haloragaceae sensu lato is recognized as a family consisting of Haloragaceae sensu stricto, Penthorum, Tetracarpaea, and Aphanopetalum. About 95% of the species are in five families: Crassulaceae (1400), Saxifragaceae (500), Grossulariaceae (150 - 200), Haloragaceae (150), and Hamamelidaceae (100). Most of the families are monogeneric. The number of genera in each family is as follows:
- Crassulaceae (34),
- Saxifragaceae (33),
- Hamamelidaceae (27),
- Haloragaceae (8),
- Peridiscaceae (4),
- Altingiaceae (3),
- Iteaceae (2),
- Paeoniaceae (1),
- Cercidiphyllaceae (1),
- Daphniphyllaceae (1),
- Aphanopetalaceae (1),
- Tetracarpaeaceae (1),
- Penthoraceae (1),
- Pterostemonaceae (1), and
- Grossulariaceae (1).
Some authors do not recognize Choristylis as a separate genus from Itea. Similarly, some authors sink Liquidambar and Semiliquidambar into Altingia. Thus Altingiaceae and Iteaceae are monogeneric in some classifications.
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