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. Shrub up to 1.5 (2) m hg. Flowers pink. Very common. Usual codominante of shrub forest stratum along tops of limestone ridges all over the Cao Bang area.
CBL 1303 13 April 1999
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)