N. Vietnam, Hoa Binh prov., Mai Chau distr., Hang Kia municipality, near Hang Kia village (20°43′39′'N, 104°53′43′'E). Open secondary shrubs on steep slopes of remnant limestone highly eroded ridge at elev. 900 m a.s.l. Flowers white, sweet fragrant. Very common. Usual codominante of secondary shrub communities.