Lai Chau Prov., Phong Tho Distr., Sin Suoi Ho Municipality, Sa Ma Pho village, around point 22°32′53″N 103°33′40″E.
Secondary open evergreen broad-leaved forest and secondary woodlands on very steep mountain slopes composed predominantly with weathered granite at elev. about 1600-1800 m a.s.l.
Tree 10-12 m tall on steep open wet slope. Flowers light pink-violet, inside deep purple-violet. Common.
HAL 10523 11 Dec. 2006 Photo. Coll.: Nguyen Tien Hiep, L.Averyanov, Phan Ke Loc, Pham Van The, N.T.Vinh.