N. Vietnam, prov. Cao Bang, distr. Tra Linh, municipality Quang Vinh (N 22°51′ E 106°14′), about 21 km from Cao Bang town to the N. Secondary evergreen closed wet forest on steep slopes of remnant limestone ridge at about 650 m alt. Shrub up to 2.5 m hg in open place. Flowers pink-purple, anthers yellow. Very common.
CBL 975 09 Dec. 1998
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)