Quang Binh Prov., Tuyen Hoa Distr., Lam Hoa municipality, Chuoi village, around point 17°56′51”N 105°49′18”E.
Secondary broadleaved evergreen closed forest in humid wet depression between remnant mountains composed with rocky highly eroded crystalline limestone at elev. about 100 m a.s.l.
Herbaceous vine 4-6 m long among mossy open rocks. Rare.