1, different varieties: cowpea belongs to Leguminosae, Leguminosae, Vigna and Vigna, which is an annual twining, herbaceous vine or nearly erect herb, and red bean belongs to Leguminosae, Leguminosae, Vigna and Red bean, which is an annual, erect or twining herb.

2. Different pods: cowpea pods are drooping, linear, upright or obliquely spreading, 7.5-70cm long and 6-10 mm wide; Red bean pods are flat or bent downward, cylindrical, hairless, 5-8 cm long and 5-6 mm wide.