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. Terrestrial herb up to 0.3 m hg in vet place. Flowers white with light violet tint. Common. Usual weed in the area.
CBL 1807 29 April 1999
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)