N. Vietnam, Son La prov., Moc Chau distr., Long Luong municipality, near Sang Cai village (20°45′51′'N, 104°51′26′'E). Primary wet broad-leaved evergreen and semideciduous mossy forest along tops of remnant limestone highly eroded ridge at elev. 1500 m a.s.l. Tree about 15 m hg. Flowers white, pleasant bitter-spicy fragrant. Not rare.