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Aralia spinosa L. Araliaceae. Devil's walking stick, Prickly ash, Hercules' club. Tree. Distribution: Eastern North America. Contact with sap causes skin irritation, raw berries mildly toxic to humans, causing diarrhoea and vomiting. Eaten by bears. Used medicinally by Native Americans for a variety of conditions. Photographed in the Medicinal Garden of the Royal College of Physicians, London.