N. Vietnam, prov. Cao Bang, distr. Bao Lac, municipality Yen Lac, vicinities of Yen Lac village (N 22°44′ E 105°50′). Secondary open shrubs on shale alluvial valley between limestone remnant karst ridges along stream at 1050-1100 m elev. Herb up to 15 cm hg in secondary short tall grasslands. Flowers yellow. Common.
CBL 1445 16 April 1999
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)