N. Vietnam, prov. Cao Bang, distr. Thach An, municipality Duc Xuan, (N 22°21′ E 106°27′), about 39 km to SSE from Cao Bang town. Secondary open shrubs on alluvial foothills of remnant limestone ridge at 400 m alt. Shrublet up to 1.5 m hg in open places. Flowers pale yellow. Very common.
CBL 822 02 Dec. 1998
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)