Revision of the Maddenia clade of Prunus (Rosaceae)

The Maddenia clade of Prunus L. is monographed based on herbarium and field studies. Four species are currently accepted in this group: Prunus himalayana J.Wen, P. hypoleuca (Koehne) J.Wen, P. hypoxantha (Koehne) J.Wen, and P. gongshanensis J.Wen, with the last described herein as a new species. Maddenia fujianensis Y.T.Chang and M. incisoserrata T.T.Yü & T.C.Ku are treated as synonyms of Prunus hypoleuca.