Climbers, usually herbaceous, sometimes woody. Leaves entire, lobed or palmately compound with 3-7 leaflets, glabrous or pubescent. Flowers solitary and axillary, in few-flowered dichasia or sub-umbellate. Sepals sub-equal, oblong to elliptic. Corolla campanulate, white or yellow, some with purple centers. Anthers spirally twisted with complete dehiscence, the pollen 3-colpate or rarely pantocolpate. Stigmas globose or bi-globose. Fruit capsular, longitudinally dehiscent by 4-6 valves or irregularly. Seeds glabrous or pubescent.