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. Deciduous tree up to 20 m hg. Flowers pale green or greenish-white. Common. Usual codominante of 1 forest stratum all over the Cao Bang area.
CBL 1292 13 April 1999
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)