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 semideciduous broadleaved forest on tops of remnant limestone ridge at 600 m alt. Treelet up to 3 m hg. Not rare.
CBL 843 03 Dec. 1998
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)