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Phaseolus vulgaris Linn is a herbaceous annual plant grown worldwide for its edible dry seed (known as just "beans"). Raw or undercooked beans contain the toxin phytohaemagglutinin. Its leaf is also occasionally used as a vegetable and the straw as fodder. Its botanical classification, along with other Phaseolus species, is as a member of the legume family Fabaceae, most of whose members acquire the nitrogen they require through an association with rhizobia, a species of nitrogen-fixing bacteria.