Nghe An Prov., Ky Son Distr., Na Ngoi Municipality, eastern slopes of Phu Xai Lai Leng mountain system.
Open secondary broad-leaved forest and scrub on steep mountain slopes composed of sansdstone at elevation 700-800 m a.s.l. around point 19°13′21.9″N 104°15′04.0″E.
Herbaceous vine 4-6 m long. Flovers dull dirty violet. Not rare.