Dien Bien Prov., Tua Chua Distr., Sin Chai Municipality, around point 22°03′38”N 103°18′56”E.
Remnants of primary humid evergreen broad-leaved forest on very steep slope of remnant hill composed with highly eroded marble-like solid crystalline limestone at elevation about 1250 m a.s.l.
Herbaceous vine to 6 m long in rather open rocky place. Common.
CPC 872 13 December 2010 Coll.: L.Averyanov, P.K.Loc, P.V.The, N.T.Vinh.