N. Vietnam, prov. Cao Bang, distr. Bao Lac, municipality Ca Thanh, about 3 km to SW from Yen Lac village (N 22°44′ E 105°50′), about 42 km to NWW from Cao Bang town. Secondary open shrubs on alluvial foothills of limestone remnant ridge at 1300 m alt. Shrub 1.5-2 m hg. Flowers yellow. Very common.
CBL 386 18 Nov. 1998
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)