Trees small, few branched. Leaves opposite, 2- or 3-pinnately compound; leaflets entire. Inflorescences racemose, terminal, erect. Calyx large, purple, broadly campanulate, fleshy, apex subtruncate. Corolla purple-red, campanulate; limb slightly bilabiate; lobes spreading, rounded, margin sinuous. Stamens 5, subequal; filaments slender, long, compressed; anthers ellipsoid, 2-celled. Style filiform; stigma lingulate, compressed. Capsule dehiscing septicidally, long lanceolate, woody, compressed, ca. 1 m; septum woody. Seeds in several rows, very thin, compressed, rounded, surrounded by a transparent broad wing.

One species: Bhutan, Cambodia, China, India, Indonesia, Laos, Malaysia, Myanmar, Nepal, Philippines, Sri Lanka, Thailand, Vietnam; one species in China.