Nghe An Prov., Ky Son Distr., Nam Can Municipality, eastern slopes of Phu Xai Lai Leng mountain system.
Secondary broad-leaved open forest and secondary scrub on very steep clay laterite hill slopes on shale along road at elevation 650-750 m a.s.l. around point 19°13′21.9″N 104°15′04.0″E.
Herbaceous vine 2-3 m long among open shrubs. Flowers white. Very common.
20 October 2013 CPC 5499 Coll.: L.Averyanov, N.T.Hiep, N.S.Khang, L.M.Tuan