S. Vietnam, Dak Lac Prov., Krong Bong Distr., Cu Pui Municipality, elevation from Dak Tour village (12°30′N, 108°30′E) to main peak of Chu Yang Sinh mt system (12°24′N, 108°26′E) along Dak Tour river (N slope). Primary wet closed mountain broad-leaved and mixed forest on granites along very steep shady slopes of river canyon at elev. 1750 m. Woody vine 3-4 m hg on open mossy cliff. Flowers white. Not rare.
VH 6319 11.05.2000
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6383-98)