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. 550-600 m a.s.l.
Woody vine 5-6 m long in rather open place. Flowers dull greenish with rddish center. Not common.