FLORA OF VIETNAM Rubiaceae Uncaria cordata (Lour.) Merr.
Vietnam, Thua Thien – Hue Prov., A Luoi Distr., Huong Nguyen Municipality, in vicinities of Tra Ve forest protection station, around point 16°13′47′'N, 107°27′47′'E at elevation about 80-120 m a.s.l.
Secondary closed evergreen broad-leaved forest on steep hill and mountain slopes composed with shale along stream valley.
Woody vine 5-10 m long in open wet place along shady wet rocky stream valley. Very common.