N. Vietnam, prov. Ha Giang, distr. Yen Minh, municipality Du Gia, E slopes of Phu Tha Ca mountain system at 1500-1600 m elev. (N 23°56′ E 105°13′). Primary evergreen broadleaved very wet mountain forest on shale very steep slopes. Terrestrial herb up to 1.7 m hg in shady place. Leaves below dirty-violet. Tepals green, anthers yellow. Rare.
CBL 2114 03 May 1999
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)