High Quality Content by WIKIPEDIA articles! Nepeta is a genus of about 250 species of flowering plants in the family Lamiaceae. The members of this group are known as catnip or catmint because of their effect on cats—the nepetalactone contained in nepeta binds to the olfactory receptors of cats, typically resulting in temporary euphoria. Catmints are also used in herbal medicine for their mild sedative effect on humans.