Vientiane Prov., Vang Vieng Distr., Na Po village, about 12 km to the W of Vang Vieng town, Pa Nang Oua Mt., around point 18°55′36.4”N 102°20′44.6”E.
Dry broad-leaved secondary evergreen forest on very steep rocky slopes and on vertical cliffs of remnant highly eroded rocky limestone mountains composed by solid crystalline limestone at elevation 350 m.
Herbaceous vine 2-4 m long in among open secondary shrubs. Flowers white. Common.