Stems slender, erect, simple or sometimes branched, more or less hairy or nearly smooth, 6 to 25 inches high, from a perennial root which propagates by suckers. Leaves opposite, oblong to oblong-lanceolate, acute at the apex, or the lower ones blunt, sharply toothed, narrowed at the base into short, slender petioles, smooth or sparingly pubescent, 1 to 3 inches long, one-half to 1 inch wide, and when crushed giving off the odor of Pennyroyal. Whorls of flowers all axillary, often shorter than the petioles. Calyx oblong-campanulate, hairy all over, five-nerved, with five acute, short teeth. Corolla white or slightly pink, about one-eighth of an inch broad, four-lobed, the posterior lobes broader than the others.

Marshes, swamps and moist soil, New Brunswick to British Columbia, south to Virginia and New Mexico. Flowering in summer and often in flower as late as October.

Memoir 15 N. Y. State Museum

Plate 191

A. American Wild Mint   Mentha canadensis

A. American Wild Mint - Mentha canadensis