Marrubium is a genus of flowering plants in the mint family, Lamiaceae. Commonly known as horehound, these plants are characterized by their square stems and opposite leaves. They are often found in temperate regions and are known for their medicinal properties, particularly in traditional herbal remedies. The most well-known species is Marrubium vulgare, or white horehound, which has been used for centuries to treat coughs and digestive issues. The leaves contain compounds that may help soothe respiratory ailments and promote digestion, making them popular in herbal teas and lozenges.