Called big potato, perennial twining herbaceous vine. Wild tubers are mostly long cylindrical; cultivated tubers are more variable, long cylindrical, conical, spherical, oblate and overlap, or have branches. Stems right-handed, glabrous, usually with four narrow wings, sometimes with spines at the base. Leaves simple, alternate in the lower part of the stem, opposite above the middle; petiole green or purplish-red, 4-15 cm long; leaf blade green or purplish-red, papery, ovate to ovate-orbicular, 6-20 cm long, 4-13 cm wide, apex short acuminate, caudate, or convex-acuminate, base cordate, deep-cordate to arrow-shaped, sometimes hastate, both auricles obtuse, both surfaces glabrous; leaf axils with bead-buds of varying sizes, the bead-buds are mostly spherical Leaf axils with pearl buds of unequal size, mostly spherical, ovate, or obovate. Dioecious; male inflorescences are spikes, 1.5-4 cm long, usually in clusters of 2 to several or arranged singly on the inflorescence axis in a panicle, with the inflorescence axis obviously zigzag, the outer tepals of male flowers broadly ovate, the inner tepals obovate, with 6 stamens; female inflorescences are spikes, 1-3 inserted in the leaf axils, the outer tepals of female flowers broadly ovate, the inner tepals obovate, with 6 stamens; female flowers are spikes, 1-3 inserted in the leaf axils, with the outer tepals of female flowers broadly ovate, with the outer tepals of female flowers obovate. Female inflorescences are spikes, 1-3 in leaf axils, outer tepals of female flowers broadly ovate, inner tepals obovate-oblong, smaller and thicker, staminodes 6, ovary inferior, styles 3, separate. Capsule trigonous oblate, 1.5-2.5 cm long, 2.5-4.5 cm wide, with membranous wings around the seeds. The seeds are surrounded by membranous wings. The flowering period is from November to January of the following year, and the fruiting period is from December to January of the following year.