N. Vietnam, prov. Cao Bang, distr. Bao Lac, municipality Dinh Phung, Nam Linh mt. (N 22°47′ E 105°49′). Secondary open forest on shale alluvial foothills of remnant karst limestone Nam Linh ridges at 1350-1400 m elev. Terrestrial herb up to 2.5 m hg in open place. Flowers white. Not rare.
CBL 1426 15 April 1999
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)