Lianas. Cymes extra-axillary, paniculate; branches racemelike or spicate, brown or rusty hairy, many flowered. Calyx with or without basal glands. Corolla rotate, lobed ca. halfway down to nearly to base; lobes ± valvate. Corona lobes 5, inserted at base of gynostegium, sometimes with ligulate adaxial appendages, longer than stamens, shorter than stigma head. Anther appendages minute; pollinia 4 per pollinarium, erect, retinaculum minute, translator arms absent. Stigma head usually club-shaped, fusiform, or long subulate. Follicles cylindric or narrowly ovoid. Seeds oblong.

Fifteen species: tropical and subtropical Asia, with a center of diversity in Malaysia; one species in China.