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In some older treatments of the family, Berberidaceae only included four genera (Berberis, Epimedium, Mahonia, Vancouveria), with the other genera treated in separate families, Leonticaceae (Bongardia, Caulophyllum, Gymnospermium, Leontice), Nandinaceae (Nandina), and Podophyllaceae (Achlys, Diphylleia, Dysosma, Jeffersonia, Podophyllum, Ranzania, Sinopodophyllum).
Mahonia is very closely related toBerberis, and included in it by many botanists. However, recentDNA-basedphylogenetic research has reinstatedMahonia, though with a handful of species transferred into the newly described generaAlloberberis (formerlyMahonia sectionHorridae) andMoranothamnus (formerlyMahonia claireae).[3] Species ofMahonia andBerberis can behybridised, with the hybrids being classified in the genus× Mahoberberis.[4][5]
Diphyllaea is closely related to or perhaps embedded withinPodophyllum. Instead of the current trend to subdividePodophyllum into three genera (Podophyllum, plusDysosma andSinopodophyllum), inclusion ofDiphyllaea in a largerPodophyllum is equally warranted.
^Yu, Chih-Chieh; Chung, Kuo-Fang (2017-12-22). "Why Mahonia? Molecular recircumscription of Berberis s.l., with the description of two new genera, Alloberberis and Moranothamnus".Taxon.66 (6):1371–1392.doi:10.12705/666.6.