N. Vietnam, prov. Cao Bang, distr. Thach An, about 25 km to SSE from Cao Bang town (N 22°27′ E 106°22). Primary evergreen closed semideciduous forest on tops of remnant limestone ridge at 500 m alt. Evergreen tree up to 10 m hg in open rocks. Flowers dirty pinkish. Common codominante of primary and secondary forests along tops of ridges.
CBL 924 05 Dec. 1998
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)