N. Vietnam, prov. Ha Giang, distr. Meo Vac, municipality Sung Chang, vicinities of Lu Lu Phin village (N 23°11′ E 105°18′). Secondary short tall grasslands and secondary shrubs on alluvial foothills of karst remnant limestone ridge among limestone rocks at 1300 m elev. Herb vine 1-2 m lg. Flowers dirty violet-greenish. Not common. CBL 1808 29 April 1999
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)