FLORA OF VIETNAM Apocynaceae Parabarium ? utile (Hayata ex Hawk) Ly
N.Vietnam, Thanh Hoa Prov., Ba Thuoc Distr., Thanh Son Municipality, E macroslope of Pu Luong range around point 20°29′38′'N, 105°06′36′'E at elev. 600 m a.s.l. (Pha Noi pass). Secondary evergreen shrubs on shale soil. Woody vine 15 m lg. Flowers white. Common.