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Mustard is an annual herb cultivated as
oil seed crop or as vegetable or as fodder, of which, 3 species are known for
its condiment value. They are pale yellow or white mustard (Brassica hirta),
brown mustard (Brassica juncea) and black mustard (Brassica nigra). The leaves
of the plant are alternate, long, bristly branched, petiolate, hairy on both
sides. Flowers are small, yellow with 4petals, cruciform. Seeds are 1.5-3mm.
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