Mentha pulegium Pennyroyal
This common herb is native to Europe, North Africa and the Middle East. It flowers from July to October and can grow to an height of 40cms. Tea can be made from the dried leaves, but is toxic to the liver and the uterus but has been used for centuries. It should only be used in moderation. The essential oil of Pennyroyal is used in aromatherapy, but ingestion of the oil can cause death.