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 4-5 m lg in wet place along stream. Flowers dull greenish, tepals with reddish base. Rare.
CBL 1448 16 April 1999
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)