N. Vietnam, prov. Ha Giang, distr. Yen Minh, municipality Du Gia, E slopes of Phu Tha Ca mountain system at 1600-1900 m elev. (N 23°56′ E 105°13′). Primary evergreen broadleaved very wet mossy cloud forest on quartzite very steep slopes. Lithophyte herb on mossy shady vertical quartzite cliff. Flowers white, sometimes with very light violet tint. Common on wet shady cliffs along waterfall sides.
CBL 2082 03 May 1999
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)