Vientiane prov., Vang Vieng distr., Patang village, around point 19°04′15.6′'N 102°24′33.2′'E.
Secondary broad-leaved semi-deciduous dry forest on very steep rocky mountain slopes composed by solid marble like highly eroded limestone at elev. about 670 m a.s.l.
Herbaceous vine 3-4 m long in open place. Flowers red. Not common.