Herbs or shrubs, often twining, very rarely trees. Leaves alternate, exstipulate, in Cuscuta 0. Cymes 1- or more-flowered ; bracteate. Flowers regular, hermaphrodite, often showy, 5- (rarely 4-) merous. Calyx deeply 5-lobed, persistent, sometimes much enlarged in fruit. Corolla campanulate or funnelshaped, rarely subrotate ; limb shortly or deeply lobed, often 5-plaited in the bud. Stamens 5, on the corolla-tube ; anthers oblong, dehiscing longitudinally. Ovary superior, often surrounded by an annular disc, of 2 carpels, 2-celled or by false dissepiments 4-celled ; style 1 rarely 2, stigma capitate 2-lobed, or 2- branched ; ovules 2 in each carpel, sessile, erect, anatropous. Fruit indehiscent, or 2-4-valved or circumsciss or breaking up irregularly, 4-2 rarely 1-seeded. Seeds erect, albumen 0 or scanty ; cotyledons generally plaited, rarely flat ; radicle next the hilum.—Species 800, more abundant in warm regions. Tribus 1. Convolvuleae. Corolla-limb plaited or induplicate in bud. Tribus 2. Cresseae. Corolla-lobes imbricate in bud. Tribus 3. Cuscuteae. Leafless, yellow, twining parasites.