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 alluvial shale valley between limestone remnant karst ridges at 1000-1050 m elev. Climbing shrub 3-4 m hg. Not common.
CBL 1323 14 April 1999
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)