N. Vietnam, prov. Ha Giang, distr. Yen Minh, municipality Du Gia, E slopes of Phu Tha Ca mountain system at 1700-1800 m elev. (N 23°56′ E 105°13′). Primary evergreen broadleaved very wet mountain forest on shale very steep slopes. Terrestrial and lithophyte herb in shady wet quartzite cliffs. Tepals outside dull greenish, inside dirty brownish. Common.
CBL 2132 03 May 1999
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)