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Castor Bean All parts of the plants are toxic, but most dangerous are the seeds. Cassava  Manihot esculenta Clover  Light skinned animals are particularly affected if they are allowed to eat when it is wet. Cocklebur Poisoning also affects cattle, sheep, horses, and fowl.  The plant is most hazardous at the seedling stage because of its toxicity as well as palatability.  Corn cockle Agrostemma githago Chinaberry  Melia azedarach Crown of Thorns The poisonous principle is present in all parts of the plant.  Curly Dock Curare  Strychnos toxifera