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 350-450 m.
Herbaceous epiphytic and lithophytic vine 4-6 m long on open mossy rocks. Flowers white, tube inside with finest purple-violet markings. Common.