N. Vietnam, prov. Cao Bang, distr. Tra Linh, municipality Co Muoi, vicinities of Lung Dat village (N 22°51′ E 106°14′), about 22 km from Cao Bang town to the N. Secondary open broadleaved forest and shrubs on foothills of remnant limestone ridge at 600-650 m alt. Shrublet up to 1 m hg in open place. Flowers pink-violet. Common.
CBL 1148 12 Dec. 1998
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)