338 Menthaceae 
4-cleft or else one of the lobes wider and emarginate. Stamens 2 or 4, only 2 with 
anthers. Nutlets truncate at tip, narrowed below, 3-angled, smooth. (Gk. lykos=a 
wolf, pous—=a foot; from a fancied resemblance in the leaves. ) 
A. _ All of the leaves or all but the upper ones irregularly incised or laciniate-pinnatifid. 
W.E. L. americanus Muhl. 
AA. — Leaves merely serrate. 
B. Calyx-teeth lanceolate or deltoid, obtuse or barely acutish, shorter than the mature 
nutlets. W.C.E. (L. virginicus for our region.) 
L. uniflorus Michx. (Bugle-weed) 
BB.  Calyx-teeth narrow, very acute, longer than the mature nutlets. 
C. Leaves short-petioled; bracts about half the length of the calyx; corolla almost 
twice as long as the calyx. W. 
L. rubellus Moench. 
CC. — Leaves sessile or very short-petioled; bracts almost as long as the calyx; co- 
rolla very little longer than the calyx. E. 
L. lucidus Turez. 
MENTHA MINT 
Herbs, perennial, erect or diffuse, with mint odor. Leaves simple, sessile or petioled, 
mostly punctate. Flowers small, whorled, purple or pink or white; whorls axillary or in 
spikes; spikes terminal. Calyx campanulate to tubular, 10-veined, regular to slightly 
2-lipped, 5-toothed. Corolla-tube shorter than the calyx; limb 4-cleft, slightly irregular; 
upper lobe usually wider, entire or emarginate. Stamens 4, equal. Nutlets ovoid, smooth. 
(Minthe was a nymph whom the Greeks believed was changed into a Mint.) 
A. Stems finely retrorse-pubescent at least on the angles; flowers in the axils of ordinary 
leaves. 
B. Leaves pubescent; stem pubescent on the sides and angles. W.E. (M. canaden- 
sis lanata.) M. canadensis L. (Field Mint) 
BB. Leaves glabrous; stem glabrous on the sides, minutely pubescent on the angles. 
W.C.E. (M. canadensis borealis; M. occidentalis. ) 
M. canadensis glabrata Benth. 
AA. Stems glabrous or nearly so, hairs when present not retrorse; most of the flowers 
in the axils of bracts. 
C. Leaves sessile or nearly so; flowers sessile. W. E. (M. spicata viridis.) 
: M. spicata L. (Spearmint) 
CC. Leaves petioled; flowers pedicelled. 
D. Calyx-teeth hairy; leaves ovate-oblong to lance-oblong, acute; garden escape. 
M. piperita L. (Peppermint) 
DD. Calyx-teeth glabrous; leaves ovate, obtuse or the upper acute. W. 
M. citrata Ehrh. (Bergamot Mint) 
MICROMERIA YERBA BUENA 
Herbs (ours) or shrubs, ours a prostrate vine. Leaves entire or merely dentate 
(ours). Flowers small, in bracted spikes or few in the leaf-axils (ours). Calyx tubular, 
13—15-veined, regular or somewhat 2-lobed, 5-toothed. Corolla short; tube straight, 
usually about equaling the calyx; limb 2-lipped; upper lip erect, entire or emarginate; 
lower lip spreading, 3-lobed. Stamens 4, included, 2 shorter. (Gk. mikros—small, 
meros—a division ; referring to the slightly 2-lipped perianth.) W. C. (M. chamissonis. ) 
M. douglasii Benth. (Tea Vine) 

