Seed when castor beans have been ingested by animals. In addition, seeds containing amygdalin—apple, apricot, bitter almond, peach, plum, cherry, quince, and others—when consumed in sufficient amounts, may cause cyanide poisoning. Other seeds that contain poisons include annona, cotton, custard apple, datura, uncooked durian, golden chain, horse-chestnut, larkspur, locoweed, lychee, nectarine, rambutan, rosary pea, sour sop, sugar apple, wisteria, and yew. The seeds of the strychnine tree are also poisonous, containing the poison strychnine. The seeds of many legumes, including the common bean ("Phaseolus vulgaris"), contain proteins called lectins which can cause gastric distress if the beans are eaten without cooking.
Mandragora (genus) contain highly biologically active alkaloids that make the plants poisonous. Their roots in particular have a long use in traditional medicine. Mandrakes are involved in many myths and superstitions. Species of "Mandragora" are perennial herbaceous plants. They have large vertical tap-roots, sometimes forked. Their stems are short or virtually absent. The leaves form a rosette at the base of the plant. The flowers are sometimes borne on a short stalk (scape), and are solitary, with whorls of five parts. The sepals are joined at the base, as are the petals, both in the shape of a lobed bell. The stamens