N. Vietnam, Thanh Hoa prov., Ba Thuoc distr., Co Lung municipality, territory of Pu Luong protected area, near Pu Luong village (20°27′01′'N, 105°11′03′'E). Secondary open shrubs along river at elev. about 100 m a.s.l. Shrub about 2 m hg in wet river slope. Flowers dull yellowish-pink. Very common.