N. Vietnam, prov. Ha Giang, distr. Yen Minh, municipality Lao Va Chai, vicinities of Ngan Chai village, 6 km to W of Yen Minh town (N 23°07′ E 105°08′). Secondary wet mossy forest on steep slopes of karst remnant limestone ridge at 1200-1400 m elev. Terrestrial herb in wet open place. Flowers white, often with yellowish or pink tint. Not rare.
CBL 1965 01 May 1999
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)