Phylum Magnoliophyta Cronquist, Takht. & Zimmerm. ex Reveal (1996) see Infraphylum Angiospermae auct. Class Magnoliopsida Brongn. (1843) Subclass Rosidae Takht. (1967) see Superorder Rosanae Takht. (1967) Superorder Saxifraganae Reveal (1994) Order Saxifragales Bercht. & J.Presl (1820) Family Pterostemonaceae Small (1905), nom. cons. see Family Iteaceae J.Agardh (1858), nom. cons. Genus Pterostemon Schauer (1847)