N. Vietnam, prov. Cao Bang, distr. Nguyen Binh, municipality Ca Thanh (N 22°44′ E 105°50′). Primary semideciduous mixed forest along tops of remnant karst limestone ridge at 1350-1400 m elev. Evergreen tree up to 5 m hg. Common. Usual codominante of 2 forest stratum all over the Cao Bang area. Cutting widely for bark exported to China as medicine drag. Become rare and rare.
CBL 1288 13 April 1999
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)