Vietnam, Thua Thien – Hue Prov., A Luoi Distr., Huong Nguyen Municipality, in vicinities of Tra Ve forest protection station, around point 16°16′08′'N, 107°26′29′'E at elevation about 125 m a.s.l.
Secondary closed evergreen broad-leaved forest on hill slopes composed with shale.
Woody vine 10-12 m long. Flowers red-purple. Not common.