N. Vietnam, prov. Ha Giang, distr. Yen Minh, municipality Du Gia, E slopes of Phu Tha Ca mountain system at 1600-1700 m elev. (N 23°56′ E 105°13′). Primary evergreen broadleaved very wet mountain forest on shale very steep slopes. Terrestrial and lithophyte sedge on vertical shady quartzite cliff. Common.
CBL 2129 03 May 1999
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)