Quang Binh Prov., Minh Hoa Distr., Thuong Hoa Comm., Ban On Vill., Pa Nun Valley, 17°40′22″N, 105°58′22″E, 250 m.
Edges or in rather open places of secondary, sometimes also in heavily logged primary evergreen broad-leaved forests on foot and slope of limestone mts.
Pendent shrub, 2-3 m tall. Flowers pinkish-violet.