N. Vietnam, prov. Ha Giang, distr. Yen Minh, municipality Du Gia, E slopes of Phu Tha Ca mountain system at 1400 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 in shady places. Flower buds light violet. Not rare.
CBL 2030 03 May 1999
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)