plural of pennyroyal

Mentha pulegium, a plant of the mint family, formerly much used in various medicinal treatments and as a flea repellent.

plural of American pennyroyal

Blue curls, Trichostema dichotomum, native to the eastern US.

An annual mint native to the western Mediterranean and the Azores, Mentha cervina, having a similar scent and other properties to pennyroyal.

A pennyroyal-scented herb of eastern North America, Hedeoma pulegioides.