Kidney beans , also known as kidney bean, two-season bean or green bean, belongs to the genus Phaseolus in Leguminosae. Annual twining or nearly erect herbs. Mexican and Argentine are native to America, and they were introduced and cultivated in China 16.
Annual twining or nearly erect herbs. Stems pubescent or glabrous when old.
Pinnate compound leaves with 3 leaflets; Stipules lanceolate, about 4 mm long, basifixed. Leaflets are broadly ovoid or rhomboid, oblique, 4-16cm long and 2.5- 1 1 cm wide, with long and sharp tips, rounded or broadly wedge-shaped bases, entire and pubescent. The raceme is shorter than the leaves, and there are several flowers at the top of the inflorescence; Pedicel 5-8 mm long; Bracteoles ovoid, with several raised veins, about as long as calyx or slightly longer than calyx, persistent; Calyx cup-shaped, 3-4 mm long, and the upper two lobes are connected into a slightly concave lobe; Corolla white, yellow, purple or red; Flag petal is nearly square, 9-65438 02 mm wide, wing petal is obovate, keel petal is about 65438 0 cm long, the top is curled, the ovary is pubescent and the style is squashed. The pod is banded, slightly curved, with a length of 10- 15cm and a width of 1- 1.5cm, slightly enlarged, usually hairless, and a beak at the top; 4-6 seeds, oval or kidney-shaped, 0.9-2 cm long and 0.3- 1.2 cm wide, white, brown, purple or spotted, and the hilum is usually white. Bloom in spring and summer.
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