548 . LABIAT Z& MENTHA 
LYCOPUS 
at the apex, sharply dentate, mostly rounded at base, usually slender-peti- 
oled, 1-3 inches loug: spikes dense, becoming 3-8 inches long in fruit: 
bracts lanceolate-subulate or the lower sometimes larger: calyx ‘villous- 
pubescent, its 3 upper teeth acute or acutish: corolla 4-6 lines long. In 
moist soil, eastern Washington to California, Pennsylvania and Ontario. 
II Ovary deeply 4-parted. Nutlets smooth or granulate, with 
small basal scar of attachment. Seeds mostly exalbumenous. 
Tribe 2 Menthoidex Benth in DC. Prodr. xii, 149. Corolla 
less strongly bilabiate and the lobes flatter than in the succeeding 
tribes, upper lip not galeate or concave. Stamens not declined, the 
postertor pair shorter or wanting. Anthers, in our genera, 2-celled; 
the cells distinct or more or less conflwent. | 
3 MENTHA L. Sp. 576 
Erect or diffuse herbs with simple mostly punctate leaves and 
small pink, purple or white flowers in axillary whorls, or dense 
or interrupted terminal spikes. Calyx campanulate to tubular, 
10-nerved, regular to slightlv bilabiate, 5-toothed. Corolla with 
tube shorter than the calyx, and somewhat irregular 4-cleft limb; 
the posterior lobe usually somewhat broader than the others, en- 
tire oremarginate. Stamens 4, equal, erect, sometimes imperfect: 
filaments glabrous: anthers two-celled, the cells parallel. Ovary 
4-parted : style cleft at the summit. Nutlets ovoid, smooth. 
M. Canadensis L. Sp 577. More or less pubescent perennial: stems 
erect, bees or branched, usually slender, 6-30 inches high : leaves oblong 
or ovate-oblong- or oblong-lanceolate, slender-petioled acute at the apex, 
or the lower obtuse, sharply serrate, narrowed to a somewhat cuneate 
acute or obtuse base, glabrous or very sparingly pubescent, the larger 2-3 
inches long: flowers all in short and dense sessile axillary glomerules : calyx 
oblong-campanulate, densely or sparingly pubescent all over, its teeth — 
about one third as long as the tube. In moist meadows, Brit. Columbia 
to California and across the Continent. 
4 LYCOPUS L. Sp. 21, 
Perennial herbs with erect or diffuse stems, mostly dentate 
leaves and small flowers bracted and verticillate in dense axil- 
lary clusters. Calyx campanulate, regular or nearly so, 4—5- 
toothed, not bearded in the throat. Corolla campanulate to cy- 
lindric, equalling or longer than the calyx, the limb nearly equal- 
ly 4-cleft, or one of the lobes larger and emarginate. Perfect 
stamens 2, anterior, the posterior pair rudimentary or wanting; 
anther-cells parallel. Nutlets smooth, trigonous, truncate at the 
summit. 
L. Virginicus L. Sp. 21. Glabrous or puberulent: stems slender, 
6-24 inches high, simple or branched: propagating by long filiform some- 
times tuber-bearing stolons: leaves lanceolate to ovate-lanceolate, acumin- 
ate at the apex, coarsely and sharply dentate, narrowed or cuneate at the 
base, 1-3 inches long, 6-18 lines wide, petioled, or the upper sessile: bracts 
short, oblong: calyx about a line long, 4- or sometimes 5-toothed, the teeth 
ovate or ovate-lanceolate, obtuse or subacute: corolla about a line broad, 
nearly twice as long as the calyx: nutlets as long or longer than the calyx. 
