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. Woody vine in open place. Flowers white with yellow center. Not common.
CBL 1972 01 May 1999
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)