FLORA OF VIETNAM Rubiaceae Lasianthus langkokensis Pit.
N.Vietnam, Thanh Hoa Prov., Ba Thuoc Distr., Co Lung Municipality, Khuyn village, around point 20°26′31′'N, 105°14′55′'E. Primary evergreen seasonal broad-leaved submontane forest on crystalline marble-like highly eroded limestone, slopes of limestone ridge near the top at elev. 700-800 m. Shrub 2-3 m tall. Fruits blue. Common.