Annual, scandent, climbing or trailing, scabrous or hairy. Monoecious or dioecious. Tendrils proximally 3-6-fid, less often bifid. Leaves simple, palmately 5-7-lobed, rarely subentire, lamina sometimes gland-dotted. Petiole eglandular. Probracts at leaf axil, glandular. Flowers medium to large, yellow; male flowers racemose. Calyx-tube shortly campanulate, calyx lobes relatively large, enclosing petals in bud, entire. Petals 5, free. Stamens 3(5), all monothecous or one 1-locular and others 2-locular, filaments inserted on the tube, free; anthers free; connective broad, thecae marginal, much convoluted; female flowers solitary. Ovary smooth, ribbed, tuberculate or spiny, stigmas 3, bibbed; ovules many, horizontal, calyx-tube short. Fruit medium sized to large, subglobose to elongate-cylindrical, beaked, smooth, ribbed or sparsely to densely spiny with short to rather long spines, brownish, dry and fibrous, dehiscent by an apical operculum. Seeds medium-sized, distinctly compressed, oblong-elliptic in outline.