Pennyroyal is a perennial herb belonging to the mint family, known scientifically as Mentha pulegium. It has small, round leaves and produces tiny purple flowers. Traditionally, it has been used for culinary purposes and as a natural remedy for various ailments, including digestive issues and respiratory problems. This herb is native to Europe and parts of Asia but can also be found in North America. While pennyroyal oil is sometimes used in aromatherapy, it is important to note that it can be toxic in high doses and should be used with caution.