Scrambling or climbing perennial herbs, glabrous or pubescent with simple hairs. Leaves alternate, 1 or 2 per node (but not opposite) simple, entire, petiolate. Flowers solitary in leaf axils, bisexual, regular. Calyx deeply 5-lobed. Corolla urn-shaped, white or yellow; limb 5-lobed, the lobes reflexed, valvate in bud. Stamens 5, equal in height, inserted on corolla-tube; anthers bilocular, not cohering, dorsifixed, dehiscing by longitudinal slits. Ovary bilocular, an annular disc prominent at base; stigma capitate. Fruit a berry. Seeds disc-shaped.