N. Vietnam, prov. Cao Bang, distr. Bao Lac, municipality Yen Lac, vicinities of Yen Lac village (N 22°44′ E 105°50′), about 44 km to NWW from Cao Bang town. Secondary open forest on alluvial foothills of remnant limestone ridge at 1100-1200 m alt. Terrestrial and epilite herb up to 1 m hg in open places along stream. Flowers dirty-pink to deep purple. Very common.
CBL 285 15 Nov. 1998
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)