N. Vietnam, prov. Cao Bang, distr. Ha Lang, municipality Thang Loi, vicinities of Lung Sam village (N 22°45′ E 106°42′). Secondary wet evergreen broadleaved forest with remnants of primary elements on steep slopes and bluffs of karst remnant limestone ridge at 500-550 m elev. Shrub up to 3 m hg. Flowers white. Commonest shrub on open rocks. Usual codominante of secondary shrub communities in the area.
CBL 1633 23 April 1999
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)