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"The mint family of plants, of which the most important species are peppermint, spearmint and penny-royal, all contain an aromatic essential oil, possessing medicinal qualities." -Lupton

Peppermint

"The mint family of plants, of which the most important species are peppermint, spearmint and penny-royal,…

"The upper part of Peppermint (Mentha piperita), with flowers. a, flower; b, calyx." -Century, 1889

Peppermint

"The upper part of Peppermint (Mentha piperita), with flowers. a, flower; b, calyx." -Century, 1889