N. Vietnam, prov. Cao Bang, distr. Bao Lac, municipality Yen Lac, vicinities of Yen Lac village (N 22°44′ E 105°50′). Primary semideciduous broadleaved forest on steep slopes and bluffs of S. exposition near the tops of remnant karst limestone ridge at 1350-1400 m elev. Terrestrial herb on open wet rocks. Flowers yellow. Not rare.
CBL 1470 16 April 1999
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)