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. Herb up to 50 cm hg on open wet shale rocks along stream. Flowers outside dirty white with light brownish marks, inside white and yellow. Not rare.
CBL 141 11-12 Nov. 1998
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)