Vietnam, Ha Giang Prov., Bac Me Distr., Phieng Luong Municipality, about 1.5 km to SW of Phieng Luong Municipality headquarter (22°39′29″N, 105°19′35″E).
Secondary open evergreen broad-leaved forest along rocky streamlet valley at the base of steep slopes of mountains composed with solid highly eroded crystalline and partially shale limestone at elev. about 850 m a.s.l.
Climbing shrub or vine up to 10 m long. Flowers dull yellow-green. Very common.