N. Vietnam, prov. Ha Giang, distr. Yen Minh, municipality Du Gia, E slopes of Phu Tha Ca mountain system at 1500-1600 m elev. (N 23°56′ E 105°13′). Primary evergreen broadleaved very wet mountain forest on shale very steep slopes. Lithophyte herb on wet vertical quartzite cliffs along waterfall sides. Common.
CBL 2123 03 May 1999
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)