N. Vietnam, prov. Cao Bang, distr. Thach An, municipality Van Trinh, (N 22°21′ E 106°27′), about 39 km to SSE from Cao Bang town. Secondary open broadleaved forest and shrubs on foothills of remnant limestone ridge at 500 m alt. Tree up to 20 m hg. Not rare.
CBL 849 03 Dec. 1998
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)