1 annual twining herb. Stems and petioles are barbed. The leaves are opposite, palmately 5 ~ 7-parted, with coarse hairs on both sides, coarse serrations on the leaf margin, and the petiole is 5 ~ 20 cm long. Flowers are unisexual and dioecious. Male inflorescence conical, terminal or axillary, each with 5 perianth segments and 5 stamens; Female inflorescence subglobose, axillary, bracts ovate-lanceolate. Achenes are oblate and yellowish brown (swatch 5 1, 273). Born in farmland and wasteland. It is a common main weed in dry land.