This section is from the book "Harper's Guide To Wild Flowers", by Caroline A. Creevey. Also available from Amazon: Harper's Guide To Wild Flowers.
M. piperita - Color, purple. Calyx, streaked with purple, hairy. Leaves, petioled, dark green, oblong to lance-shaped, purple-veined. Flowers, in whorls of dense continuous or interrupted spikes, terminal, or sometimes axillary. July to September.
In wet soil, along brooks. The peppermint of confectionery and medicine.
 
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