Hoa Binh Prov., Mai Chau Distr., Pa Co Municipality, Xa Linh village, Rung gia locality, around point 20?44′30″ N, 104?56′26″ E, 968 m a.s.l.
Edges of closed or open evergreen broad-leaved submontane forests on foots of limestone mountain. Herbaceous vine, up to 5-7 m long. Flowers yellow. HAL 8967 23 Jul 2006 Photos Id. by Nguyen Huu Hien Collectors: Phan Ke Loc, Le Dong Tan, Nguyen Sinh Khang & Nguyen Tien Vinh
Collected with the financial support from NYBG, U.S.A.