Annual or perennial herbs. Stem angular, hispid or hairy. Tendrils branched, mostly 2-4-fid. Leaves petiolate, ovate, generally 5-lobed, base cordate, hirsute or scabrescent. Flowers large, yellow, solitary; monoecious. Male flowers rarely fascicled. Calyx campanulate, lobes 5, subulate, spathulate or leafy. Corolla campanulate, shallowly 5-lobed, lobes usually recurved. Stamens 3, inserted low on the calyx tube. Filaments free, anthers linear and connate, one monothecous and two dithecous; connectives not produced. Pistillode absent. Female flowers shortly pedunculate. Ovary oblong, style simple, short, stigmas 3(5), papillose, ovules many, horizontal. Fruit fleshy, indehiscent, many-seeded. Seeds ovate or oblong, smooth, marginate or emarginate.