FLORA OF VIETNAM Convolvulaceae Argyreia aff. atropurpurea Wall.
N.Vietnam, Thanh Hoa Prov., Quan Hoa Distr., Phu Le Municipality, Hang village, around point 20°31′33′'N, 105°05′06′'E. Secondary and primary evergreen seasonal broad-leaved closed lowland forest on steep slopes of rocky ridge composed with crystalline marble-like highly eroded limestone at elev. 350-450 m. Woody or semiwoody vine 15-20 m lg. Flowers white with pink tint. Common.