N. Vietnam, prov. Ha Giang, distr. Yen Minh, municipality Du Gia, E slopes of Phu Tha Ca mountain system at 1900-2000 m elev. (N 23°56′ E 105°13′). Primary evergreen broadleaved very wet mossy cloud forest on quartzite very steep slopes. Terrestrial and lithophyte herb on mossy quartzite cliffs. Common.
CBL 2157 03 May 1999
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)