Mentha pulegium, commonly known as pennyroyal, is a perennial herb in the mint family. It is native to Europe and parts of Asia but can also be found in North America. The plant features small, round leaves and produces purple flowers, typically blooming in late summer. Pennyroyal has a strong, minty aroma and has been used traditionally for culinary and medicinal purposes. However, it contains compounds that can be toxic in high doses, making it important to use caution when consuming or applying it.