Its stems and branches are rough, have furrows, and are slightly pilose; Petiole rough, leaf blade triangular or subrounded, usually palmate 5-7-lobed, lobes triangular, dark green above, rough, warty points, light green below, pubescent, veined palmate, with white pubescent; Monoecious, male flowers in the upper part of the raceme, peduncle slightly stout, calyx tube broad bell shaped; Corolla yellow, radiate, apical obtuse, base narrow; Female flowers solitary, ovary long cylindrical, puberulent, stigma swollen; Fruit cylindrical, straight or slightly curved, smooth surface, often with dark vertical stripes; Seeds numerous, black, ovate, flat, smooth, margin stenopygous