N. Vietnam, prov. Cao Bang, distr. Nguyen Binh, municipality Ca Thanh, vicinities Ca Lu village, about 7-8 km to SE from Yen Lac village (N 22°44′ E 105°50′), about 38 km to NWW from Cao Bang town. Secondary forest on alluvial foothills of karst remnant limestone ridge at 1200 m alt. Herb 30-40 cm hg in open place. Flowers yellow. Not common.
CBL 518 21 Nov. 1998
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)