Lycopus rubellusLycopus rubellus, commonly known as taperleaf water-horehound, is a species of flowering plant in the mint family. It is a perennial herb native to parts of the United States, where it occurs in wetland and riparian habitats.TaxonomyLycopus rubellus was described by Conrad Moench and is accepted as a distinct species in modern taxonomic treatments.DescriptionLycopus rubellus is a perennial herbaceous plant typical of the genus Lycopus, with opposite leaves and small flowers produced in clusters in the leaf axils. As a member of the mint family, it shares characteristics common to other Lamiaceae, including square stems and bilaterally symmetrical flowers.