1050 LAMIACEAE 
= 
2. Mentha gentilis L. Stems sparingly pubescent, erect and 2-7 dm. tall, or much 
branched, the branches spreading : leaf-blades oval, ovate or elliptic, 1.5-5 em. long, acute, 
serrate, the entire base narrowed to a short petiole: clusters about 1 em. thick: calyx 1.5 
mm. long, slightly bristly ; tube campanulate; lobes triangular, acute or slightly acumi- 
nate: corolla deep pink or lilac, 2.5 mm. long, the upper lip as broad as long, deeply 
notched, the lower lip 3-lobed, the middle lobe oblong, its lateral lobes ovate or oval, ail 
obtuse. 
In waste places and along roads, Maine to New York and Georgia. Summer and fall. 
3. Mentha Canadénsis L. Stems erect, 2-6 dm. tall, simple or much branched, 
pubescent with recurved or retrorse hairs: leaf-blades oblong, elliptic or oblong-lanceolate, 
2-7 cm. long, acute, serrate, the entire bases gradually or abruptly narrowed into margined 
petioles : clusters 1-1.5 cm. thick: calyx nearly 2 mm. long, minutely pubescent; tube 
campanulate; lobes lanceolate-subulate, about 3 as long as the tube: corolla pink or white, 
3 mm. long, the upper lip broadly oblong, notched, the lower lip 3-lobed, its middle lobe 
narrowed upward, barely notched, its lateral lobes ovate, obtuse. 
In moist soil or meadows, New Brunswick to the Northwest Territory and British Columbia, North 
Carolina, Nebraska and New Mexico. Summer and fall. 
4. Mentha spicàta L. Stems glabrous or nearly so, 2-5 dm. tall, commonly much 
branched : leaf-blades oblong, elliptic or elliptic-lanceolate, acute, sharply serrate, short- 
petioled : panicles spike-like, slender, 3-10 cm. long, 5-8 mm. thick, often interrupted 
below: calyx nearly glabrous, 1 mm. long; tube campanulate ; lobes subulate from a 
broad base, as long as the tube: corolla pale pink, 2.5 mm. long, the upper lip broader 
than long, notched, the lower lip 3-lobed, its lobes ovate, obtuse. 
In waste places and on roadsides, Nova Scotia and Ontario to Minnesota, Florida and Kansas. 
Summer and fall. SPEARMINT. 
5. Mentha piperita L. Stems glabrous, erect or ascending, 2-7 dm. tall, more or 
less branched : leaf-blades oblong, oval, oblong-lanceolate or oblong-ovate, 1.5-5 cm. long, 
acute, sharply serrate, short-petioled : panicles spike-like, 2-15 cm. long, 1-1.5 cm. thick, 
often interrupted : pedicels slender: calyx glabrous, 2.5 mm. long; tube cylindric-cam- 
panulate ; lobes subulate from a broad base, shorter than the tube: corolla 4 mm. long, the 
upper lip notched, the lower lip with an oblong middle lobe and oval or oblong-oval 
lateral lobes. 
In wet places, Nova Scotia to Minnesota, Florida and Alabama. Summer and fall. PEPPERMINT. 
6. Mentha citràta Ehrh. Stems glabrous or nearly so, erect or decumbent, 3-11 
dm. long, simple or branching : leaf-blades ovate to orbicular-ovate, 1.5-4 cm. long, acute, 
sharply serrate, rounded or subcordate at the base; petioles j as long as the D 
shorter: panicles 1.5 em. thick: calyx nearly 4 mm. long ; tube cylindric-turbinate ; lobes 
subulate from a broader base, shorter than the tube: corolla pink or whitish, 4.5 mm. 
long, the upper lip notched, the lower lip with oblong-ovate obtuse lobes. 
In wet places, New York and Ohio to Georgia. Summer and fall. : 
7. Mentha rotundifólia (L.) Huds. Stems canescent-tomentose, erect or ME 
from a creeping base, 3-8 dm. tall, simple or branching : leaf-blades oblong, oval or Ds 
2-9 em. long, finely serrate, sessile or nearly so and often partly clasping : panicles S e 
like, 1-5 cm. long, about 1 cm. thick : calyx pubescent, 2.5 mm. long ; tube campanula 3 
constricted at the middle in age ; lobes lanceolate, acute, or subulate-tipped at = RE: d 
then as long as the tube: corolla pink or pale lilac, 3-3.5 mm. long, the upper lip, à 
lobes of lower lip, oblong or nearly so, obtuse. 
In open grounds or copses, Maine, Georgia. Texas and Mexico. Summer and fall. 
39. MICHELIELLA Briq. 
Perennial caulescent aromatic herbs, sometimes with glandular-pubesce 
Leaves opposite, rarely essentially whorled : blades flat, rather coarsely toothed a 
Flowers in terminal racemes or panicled racemes. Calyx spreading or rane = 
maturity : tube campanulate, 10-ribbed, 2-lipped : upper lip of 3 short lobes : lower z " 
2 longer and narrower segments. Corolla reddish or cream color. Anther-bearing stam 
4, exserted : filaments more or less coiled. Nutlets smooth. STONE-ROOT. 
. verticillata. 
Leaves 4 or rarely 6. approximate, sometimes almost whorled at the top of the stem. = 2 anísata. 
Leaves several, in pairs along the stem, A Stem finely 
1. Micheliella verticillàta (Baldw.) Briq.  Rootstock irregular. imat pairs 
pubescent, 1-5 dm. tall, simple, naked below: leaves usually 4, in 2 wp mm. long, 
at the top of the stem ; blades thin, ovate to obovate or cuneate-obovate, 8- le, 5-15 cm. 
acute or abruptly acuminate, coarsely crenate-dentate : racemes usually simple; 
nt foliage. 
, petioled. 
