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Flowerhead of the Castor. Bean (Ricinus communis) showing the red female flowers on the immature seedpods and the cream male flowers. This evergreen, 5-12m tall shrub was originally native northeastern Africa and the Middle. East but is now widespread in the tropics. The source of castor oil, it is cultivated as a foliage plant but produces very poisonous spiny fruits and seeds, and can cause contact dermatitis