N. Vietnam, prov. Ha Giang, distr. Yen Minh, municipality Du Gia, E slopes of Phu Tha Ca mountain system at 1100 m elev. (N 23°56′ E 105°13′). Primary evergreen broadleaved very wet mountain forest on shale very steep slopes. Terrestrial herb up to 1.5 m hg on shady rocky slopes. Common at 1000-1100 m elev. Leaves uniformly green below and above.
CBL 2042 03 May 1999
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)