Vines, twining or clambering. Stems often bluish green, apically tomentose grading to glabrate. Leaves not peltate. Leaf blade generally pentagonal, palmately 3-5-lobed, base cordate, margins of lobes entire or coarsely dentate, apex caudate-acuminate, not mucronate; surfaces sparsely bristly or glabrous. Inflorescences axillary, racemes or panicles; bracts absent. Flowers 3-ranked; sepals 6-9, elliptic to obovate, glabrous. Staminate flowers: petals absent; stamens 6-12; filaments distinct; anthers 2-locular; pistillodes absent. Pistillate flowers: petals absent or vestigial; staminodes 6-91, poorly developed; pistils 3; ovary ellipsoid to fusiform, glabrous; stigma multicleft. Drupes globose to ellipsoid, glabrous; endocarp smooth, cup-shaped with erose margins, glabrous.
c, s United States.
Species 1 (1 in the flora).