N. Vietnam, prov. Cao Bang, distr. Bao Lac, municipality Dinh Phung, about 5 km to NW from Yen Lac village (N 22°44′ E 105°50′), about 50 km to NWW from Cao Bang town. Secondary open shrubs on alluvial foothills of remnant limestone karst ridge at 1300-1400 m alt. Terrestrial herb. Central flowers yellow, marginal fl. blue-violet. Very common in open places.
CBL 502 19 Nov. 1998
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)