Mentha cervina
Encyclopedia
Mentha cervina, also known as Hart's Pennyroyal, a member of the mint
Mentha
Mentha is a genus of flowering plants in the family Lamiaceae . The species are not clearly distinct and estimates of the number of species varies from 13 to 18. Hybridization between some of the species occurs naturally...

 genus, is a sprawling herb
Herb
Except in botanical usage, an herb is "any plant with leaves, seeds, or flowers used for flavoring, food, medicine, or perfume" or "a part of such a plant as used in cooking"...

 growing up to .3 m tall. It is very closely related to the "real" pennyroyal
Pennyroyal
Pennyroyal refers to two plants in the mint family, Lamiaceae. For the American species, see American pennyroyal. The European pennyroyal, Mentha pulegium, , is a plant in the mint genus, within the family Lamiaceae. Crushed Pennyroyal leaves exhibit a very strong fragrance similar to spearmint...

. It has very fragrant leaves and foliage. Its essential oils are high in pulegone
Pulegone
Pulegone is a naturally occurring organic compound obtained from the essential oils of a variety of plants such as Nepeta cataria , Mentha piperita, and pennyroyal. It is classified as a monoterpene....

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