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. Climbing shrub with shoots up to 4 m lg in open places. Very common. Usual codominante of secondary shrubs all over the area (especially on wet shale soils).
CBL 1440 16 April 1999
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)