1. Different morphological characteristics. Broad bean: annual herb, 30-100 (120) cm high. The main root is short and thick, with many fibrous roots, and the root nodules are pink and dense. The stem is stout, upright, 0.7-1 cm in diameter, four-sided, hollow, and hairless. Soybean: annual herb, 30-90 cm tall. The stem is stout, upright, or the upper part is nearly winding, the upper part is more or less ribbed, and is densely covered with long brown bristles.

2. Soybeans (scientific name: Glycinemax (Linn.) Merr.) are commonly known as soybeans. It is an annual herb of the Dicotyledonidae, Fabaceae, and Soybean genus, with a height of 30-90 cm. The stem is stout, upright, densely covered with long brown bristles. Leaves usually have 3 leaflets; stipules are veined and covered with yellow pubescence; petioles are 2-20 cm long; leaflets are broadly ovate and papery; racemes are short with few flowers and long ones with many flowers; the total pedicel usually has 5 -8 sessile, tightly packed flowers; bracts lanceolate, strigose; bracteoles lanceolate, appressed setae; calyx lanceolate, flowers purple, lavender or white, with petals at the base The handle is leaf-shaped. The pods are plump, slightly curved, drooping, yellow-green, densely covered with long brown hairs; there are 2-5 seeds, oval, nearly spherical, with smooth seed coats, ranging from light green, yellow, brown and black. The flowering period is from June to July, and the fruiting period is from July to September.

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