Azuki bean ( Vigna angularis ) is a plant species in the Fabaceae family. It is an annual herb—bushy and erect, though sometimes trailing or creeping—that can root at the stem nodes and reach heights or lengths of up to 90 cm. It possesses a taproot 40–50 cm in length. The leaves are alternate and trifoliolate. The stipules are small and peltate, often three-branched with a basal appendage, while the stipels are lanceolate. The leaflets range from lanceolate to ovate, measuring 5–10 cm in length and 5–8 cm in width; they are acuminate (tapering to a point) and may be entire (unlobed) or three-lobed. The inflorescence is an axillary pseudo-raceme containing 2–20 flowers. The pedicels (flower stalks) are long on the lower nodes and become very short toward the upper nodes. The flowers are bisexual and papilionaceous (pea-like). Each flower has a short pedicel with an extrafloral nectary at its base. The bracteoles are longer than the calyx. The calyx is bell-shaped with short teeth. The...
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