Climbing or scrambling, unarmed, perennial herbs or subshrubs. Lvs usually opposite, occasionally alternate or in whorls of 3, simple, petiolate, often with a branch opposed. Fls solitary or in corymbs, axillary. Calyx deeply 5-toothed, scarcely accrescent. Corolla urceolate to tubular, white, pale green, or yellow, constricted below the 5, short, reflexed lobes. Stamens 5, equal, ± exserted; usually inserted c. middle of corolla tube. Nectary disc prominent around ovary. Stigma ± capitate. Fr. a berry, ovoid-oblong. Seeds numerous, compressed, of moderate size.