N. Vietnam, prov. Ha Giang, distr. Yen Minh, municipality Du Gia, E slopes of Phu Tha Ca mountain system at 1800-1900 m elev. (N 23°56′ E 105°13′). Primary evergreen broadleaved very wet mossy cloud forest on quartzite very steep slopes. Lithophyte herb on shady mossy vertical quartzite cliff. Not rare.
CBL 2174 03 May 1999
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)