Author: Jan Scholten
Clades: Saxifragales; Saxifragidae; Malvanae; Angiospermae; Plants.
Genera: Medusandra, Soyauxia, Peridiscus, Whittonia;12 species.
Region: Peridiscus in Venezuela, northern Brazil; Whittonia in Guyana, probably extinct; Medusandra in Cameroon, 2 species; Soyauxia in West Africa, 7 species. Medusandra has two species.
Botany: small trees or erect shrubs of wet tropical forests.
Peridiscaceae is a Family in Saxifragales.
Peridiscus and Whittonia are clearly close relatives. They and the other two genera have long been considered anomalous, variously classified by different authors. In 2009 they were united into a single family. The relationship in Saxifragales is unclear. Sometimes they are united with Hamamelidaceae, or more related to Saxifragaceae or more as outsiders of Saxifragales. Bentham placed Peridiscus in Flacourtiaceae. Daniel Oliver placed Soyauxia in Passifloraceae.
Probably Peridiscaceae should be include din Hammalidaceae in Subphase 4.