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. Woody vine up to 4-5 m lg. Flowers pale greenish. Not rare.
CBL 1388 15 April 1999
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)