N.Vietnam, Thanh Hoa Prov., Ba Thuoc Distr., Thanh Son Municipality, Bang village, E macroslope of Pu Luong range around point 20°27′52′'N, 105°07′35′'E at elev. 460 m a.s.l. Secondary evergreen shrubs on shale soil. Woody vine 15 m lg. Flowers yellowish.