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The flowerhead of the Castor. Bean (Ricinus communis), an evergreen, 5-12m tall shrub originally native northeastern Africa and the Middle. East but now widespread in the tropics. The source of castor oil, it is cultivated as a foliage plant but produces very poisonous berries and can cause contact dermatitis. The filamentous female flowers, which develop into spiny fruits, are borne above sprays of minute, creamy white male flowers