Essence of Peppermint, a popular aromatic remedy for pains in the
stomach, &c., is a solution of the oil in alcohol, of a strength corres-
ponding to the price at which it is sold. Besides the species mentioned,
there is another foreign one sparingly naturalized around old settlements
in Ohio and Pennsylvania, the Corn-mint, (M. arven'sis, L.J which has
axillary cymules^ and the stem hairy downwards ; its odor is remarkable,
and has been compared to that of decaying cheese. A native species,
M. Ganaden'sis, L., is common in wet grounds ; it has an odor* much
like that of Pennyroyal. *



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232 WEEDS AND USEFUL PLANTS.
4. HEiDEO'MA, Pers. Pennyboyal.
[Greek, J^deia Osme, a pleasant odor ; from its fragrance]

Calyx ovoid-tubular, gibbous on the under side near the base, 13-nerved,
bilabiate, — the upper lip 3-toothed — ^lower one bifid ; throat villous.
Corolla bilabiate, — the upper lip erect, flat— lower lip spreading, 3-lobed,
lobes nearly equal. Stamens 2, ascending, the twQ upper entirely want-
ing, — 5r rudinxentary and sterile. Herbs with small leaves and loose ax-
illary clusters of flowers, often forming terminal leafy racemes.
1. H. pulegioi'des, Pers. Leaves lance-ovate, rather obtuse, subserrate,
narrowed at base, petiolate ; cj mules about 3-flowered.
PuLEGiuM-LiKE Hedeoma. Ajnerican-Peunyroyal.
Root annual. /Stem 6-12 inches high, hoary-pubescent, branched. Leaves half an inch
to an inch long, slightly pubescent, narrowed at base to a pubescent petiole one-Qighth to
half an inch in lengtli, — ^tho^roZ leaves resembling the cauline ones. Cymides usually
3-flowered ; brcKtedies linear-lanceolate, scarcely as long as the pedicels. CoroUa pale
blue, with purple spotfi. Stamens scarcely exserted, ^cending, the anthers approximated
under the upper lip, — the upper pair of stamens reduced to mere abortive rudiments.
