Vientiane prov., Kasi distr., Si Sang Vone village, around point 19°06′10.9′'N 102°10′46.1′'E.
Secondary broad-leaved evergreen dry forest on very steep rocky mountain slopes composed by solid marble like highly eroded limestone at elev. 600-700 m a.s.l.
Climbing shrub in rather open place on steep rocky wet slope. Flowers white. Very common. Co-dominant of secondary scrub in wet places.