N. Vietnam, prov. Cao Bang, distr. Bao Lac, municipality Dinh Phung, Nam Linh mt. (N 22°47′ E 105°49′). Old secondary broadleaved wet mossy cloud forest along tops of remnant karst limestone Nam Linh ridge at 1550-1600 m alt. Terrestrial herb up to 1.2 m hg in shady deep karst crevices and depressions. Tepals green, anthers yellow. Not rare.
CBL 1405 15 April 1999
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)