N. Vietnam, prov. Cao Bang, distr. Bao Lac, municipality Dinh Phung, Man Lung ridge (N 22°47′ E 105°49′). Secondary wet closed broadleaved evergreen forest with bamboo on shale alluvial foothills of limestone Man Lung ridge at 1400-1500 m elev. Terrestrial herb up to 25 cm hg. Flowers pale lilac. Common.
CBL 1542 18 April 1999
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)