Vientiane prov., Kasi distr., Si Sang Vone village, around point 19°06′10.9′'N 102°10′46.1′'E.
Secondary and primary evergreen dry forest on very steep rocky mountain slopes composed by solid marble like highly eroded limestone at elev. 600-750 m a.s.l.
Climbing shrub or small woody vine to 2 m long in rather open place in secondary scrub. Flowers white. Common.