N. Vietnam, prov. Cao Bang, distr. Nguyen Binh, municipality Nguyen Binh (N 22°37′ E 105°52′), about 41 km to W from Cao Bang town. Elevation from Le A pass to Na Ni mt. peak at 1400-1900 m alt. Old secondary closed evegreen wet mountain forest on soils developed on granite and shale rocks. Herb up to 40 cm hg on steep shadow mt slopes of mt stream canyon. Flowers pink. Common.
CBL 194 11-12 Nov. 1998
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)