Cowpea (cowpea), commonly known as kidney bean, ginger bean, belt bean and hanging bean. Cowpea is divided into long cowpea and rice cowpea, belonging to leguminous plants. Cowpea is an annual plant in Leguminosae. There are three kinds of stems: dwarf, semi-tendril and tendril. The cultivation in South China is dominated by vines, followed by dwarf plants. An annual twining herb of Papilionaceae, with 3 leaflets, terminal lobule rhomboid-ovoid, 5 ~13cm long and 4 ~ 7cm wide, with acute apex, nearly round or wide wedge-shaped base, hairless on both sides, and lateral lobules obliquely ovoid; Stipules are ovoid, about 65438 0 cm long, with a short distance from the planting place. Calyx campanulate, glabrous; Corolla lavender, about 2 cm long, with yellowish whiskers on the upper part of the style. The pods droop linearly, up to 40 cm long. The flowering and fruiting period is from June to September.