N. Vietnam, prov. Ha Giang, distr. Yen Minh, municipality Du Gia, E slopes of Phu Tha Ca mountain system at 1400-1600 m elev. (N 23°56′ E 105°13′). Primary evergreen broadleaved very wet mountain forest on shale very steep slopes. Terrestrial and lithophyte herb on very steep rocky slopes. Flowers white. Common.
CBL 2034 03 May 1999
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)