Erect or twining glabrous shrubs. Leaves (when present). Opposite. Flowers in lax axillary or terminal cymes. Calyx 5-partite, with 5 glands on the inner side. Corolla rotate, lobes 5, usually bearded within. Corona single, a 10-lobed ring arising from the corolla a little above the stamens, often with 5 free awned segments. Stamens 5, filaments short, broad, free, anthers bearded, adjacent but not adnate to the stigma, pollen grains in tetrads. Follicles cylindrical smooth. Seeds comose.