N. Vietnam, prov. Cao Bang, distr. Bao Lac, municipality Yen Lac, vicinities of Yen Lac village (N 22°44′ E 105°50′). Primary semideciduous broad-leaved forest on steep slopes and bluffs of N exposition of remnant karst limestone ridge at 1300-1350 elev. Lithophyte herb on shady vertical cliffs. Flowers light pink. Common.
CBL 1364 13 April 1999
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)