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. Primary broadleaved semideciduous forest along tops of remnant limestone ridge at 550 m alt. Shrub or treelet 2-3 m hg. Not common.
CBL 796 02 Dec. 1998
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)