Sweet beans are annual twining herbs, about 0.9 to 1.8 meters high, all plants are hairless.
Pea is an annual climbing herb, about 0.5 to 2 meters high. The whole plant is green, smooth and hairless.
The leaves are oblong or ovoid, about 3 to 5 cm long, about 1 to 2 cm wide, entire.
Pea leaves have 4 to 6 oval leaflets, about 2 to 5 cm long and about 1 to 2.5 cm wide.
Sweet bean flowers are solitary or 1 to 3 arranged in a racemose axillary shape. The Corolla is white or purplish red.
Pea flowers are solitary in the axils of leaves or arranged in racemes, usually white and purple.
The pods of sweet beans are long and oval, about 5 to 10 cm long. There is a paper liner inside the pods. The seeds are round, generally 2 to 10, green.
Pea pods swollen, long oval, about 2.5 to 10 cm long, about 0.7 to 14 cm wide, sharp tip, round seeds, turquoise.