Vietnam, Thua Thien – Hue Prov., Huong Thuy Distr., Duong Hoa Municipality, Huong Thuy forest enterprise territory, around point 16°13′23′'N, 107°35′16′'E, SW slopes of Mang Chan ridge at elevation about 350-500 m a.s.l.
Fractionally logged primary closed evergreen broad-leaved forest along steep stream slopes composed with shale with quartzite.
Woody vine 10-15 m long along rocky stream canyon. Flowers yellowish-green. Occasional.