N. Vietnam, Prov. Cao Bang, distr. Tra Linh, municipalite Quoc Toan, vicinity of Thang Heng and Lung Tao villages near Thang Heng lake. Broadleaved evergreen closed primary forest on steep slopes and bluffs of limestone mesas and ridges at 700-900 m alt. Climbing epilitic woody vine 6-8 m lg on open steep rocky bluff. Ripe fruits orange. Not common. VH 4868 25-27.05.1997 International Botanical Expedition of the U.S.A. National Geographic Society (grant No 5803-96)