Quang Binh Prov., Tuyen Hoa Distr., Lam Hoa municipality, Hung village, around point 17°56′10”N 105°49′15”E.
Secondary shady forest in alluvial valley between remnant limestone hills composed with highly eroded marble-like crystalline limestone at elev. about 100 m a.s.l.
Semi-woody vine 4-6 m long in rather open place. Not common.