Hoa Binh Prov., Tan Lac Distr., Ngo Luong Municipality, Tram Hai Village, ca. 500 m to S of coordinate 20°27’55”N 105°17’01”E. Edges of heavily logged evergreen broad-leaved forest on slope of limestone mts., at elevation about 730 m a.s.l. Small woody vine, ca. 5-10 m long. Common.