N. Vietnam, prov. Cao Bang, distr. Bao Lac, municipality Yen Lac, vicinities of Yen Lac village (N 22°44′ E 105°50′). Secondary open shrubs on shale alluvial valley between limestone remnant karst ridges along stream at 1050-1100 m elev. Woody vine up to 10 m lg in open place. Flowers yellowish-white, later pale-yellow, fragrant. Not common.
CBL 1442 16 April 1999
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)