The herb Pennyroyal (Mentha pulegium, family Lamiaceae), is a member of the mint genus; an essential oil extracted from it is used in aromatherapy. Crushed Pennyroyal leaves and foliage exhibit a very strong mint fragrance. Pennyroyal is a traditional folk medicine poison and abortifacient. These oils are high in pulegone, a highly toxic volatile, which can stimulate uterine activity.
