Sepals 5, generally subequal, and more or less coriaceous, elliptic or lanceolate, more rarely orbicular, accrescent in the larger species. Corolla campanulate to broadly infundibuliform, often white, sometimes yellowish; midpetaline areas generally not well defined. Anthers usually twisted above. Pollen not spiny. Ovary 2–4-celled, 4-ovuled; style and stigma of Ipomœa. Capsule with generally valvular, rarely transverse dehiscence. Seeds generally 4, glabrous. —Annual or perennial plants, with generally herbaceous climbing, more rarely prostrate or trailing stems and axillary flowers, solitary or in few- to many-flowered dichasial cymes.