N. Vietnam, prov. Cao Bang, distr. Ha Lang, municipality Thang Loi, vicinities of Ban Hao (N 22°43′ E 106°40′), about 43 km to E from Cao Bang town. Secondary evergreen broadleaved closed forest on steep bluffs of remnant limestone ridges at 500-600 m alt. Shrublet up to 1.5 m hg in shadow wet canyons. Flowers pale blue. Not rare.
CBL 673 26 Nov. 1998
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)