First, the difference between leaves is that the leaves of green beans grow in opposite single leaves, which are similar to the shape of a heart. The terminal leaflets are broadly ovoid or rhomboid, about 4 to 16 cm long and 3 to 1 1 cm wide. The apex of the leaves is sharp, and the base is wide wedge-shaped or round. The veins on both sides are long and hairy, and the leaflets growing on the side are oblique.

Beans have pinnate compound leaves with 3 leaflets. The stipules are lanceolate, about 1 cm long, and the leaflets are ovoid rhombic, about 5 to 15 cm long and about 4 to 6 cm wide. The apex of the leaves is acute, and sometimes the leaves are lavender.

Second, the flowers are different from the raceme of green beans. The flowers grow at the top of the total pedicel, the bracteoles are oblique, and the corolla is white, yellow, lavender or purple, about 1.5 to 2 cm long.

The raceme of beans is axillary, with 2 to 6 flowers clustered at the top of the inflorescence, and the corolla is yellowish white with purplish blue, about 2 cm long.

Third, the fruit is different. The green bean pod is strip-shaped, slightly swollen, with a length of 10 to 15 cm and a width of about 1 cm. It is hairless and straight or slightly curved. 4 to 8 seeds.

The pods of the beans are drooping, linear, upright or obliquely spreading, about 7.5 to 70 cm long and 6 to 12 mm wide, and there are many seeds, which are oblong or cylindrical.