Saravan Prov., Sa Mouay Distr., to the SEE of Sa Mouay town, elevation from Ta Oy village (700 m elev.) to mountain ridge with highest point at 1350 m around 16°08′47.0”N 106°52′35.4”E.
Secondary evergreen broad-leaved forest on slopes composed with silicate rocks.
Herbaceous vine 4-6 m long in rather open place along ridge slopes at elevation about 800 m. Flowers light yellowish-green. Common.