Red beans are suitable for the person you like. When making a promise, send a string of acacia beans, which will wish you a smooth love and hope that two people can be happy for a long time. Also, when you get married, the bride will wear a bracelet or necklace made of bright red locust beans on her wrist or neck, which can symbolize that both men and women are soul mates and grow old together. Red bean is an annual erect or twining herb. The height is 30-90 cm, and the plants are sparse. Pinnate compound leaves with 3 leaflets; Stipules shield-shaped, arrow-shaped, 0.9- 1.7 cm long; Leaflets ovate to rhomboid-ovate, 5- 10 cm long and 5-8 cm wide, with wide triangular or nearly round apex, lateral oblique, entire or shallow trilobal, with slightly sparse hairs on both sides. Flowers yellow, about 5 or 6 peanuts at the top of short total pedicel; Pedicel is very short; Bracteoles lanceolate, 6-8 mm long; Calyx campanulate, 3-4 mm long; Corolla about 9 mm long, flag oblate or nearly kidney-shaped, often slightly skewed, with a concave top. Wing flap is wider than keel flap, and the stem and spike are shorter. The top of the keel flap is bent for nearly half a circle, one of which has a corner bulge in the middle and lower part and a stalk at the base. Ovary linear, style curved, hairy near apex.