LABIATAE. 213 



Lycopus lucidus Turcz. Stems stout, erect, 60-100 cm. high, sharply 

 angled, simple or branched above; leaves oblong-lanceolate to lanceolate, acute 

 or acuminate, sharply and coarsely serrate, rounded at base, 5-10 cm. long, 

 sessile or very short petioled; bracts lanceolate or ovate, the outer ones con- 

 spicuou , acuminate; calyx-teeth subulate-lanceolate, nearly as long as the 

 tube; corolla white, scarcely longer than the calyx; sterile stamens slender, 

 clavate at the tips. Rock Lake and Spokane County. 



312. TRICHOSTEMA. 



Low annual branched herbs, or somewhat woody plants; 

 leaves entire; calyx bell-shaped, oblique, deeply 5-cleft, the 3 

 upper teeth elongated and partly united, the 2 lower very short; 

 corolla small, almost equally 5-parted, the 3 lower lobes more or 

 less united; stamens 4, much exserted; anther-cells divergent 

 and at length confluent. 



Trichostema oblongum Benth. Annual, erect, branched, 10-30 cm. high, 

 the stem soft-hairy; leaves oblong or oval, acute, entire, 1-3 cm. long, canes- 

 cently pubescent, narrowed at base, with a short petiole; flowers in nearly 

 sessile axillary dense cymes; pedicels short; calyx campanulate, hairy, equally 

 5-cleft, the narrow lobes much longer than the teeth, equalling the corolla- 

 tube; corolla violet. Springy places, rare and local. Rather unpleasantly 

 scented. 



313. MENTHA. Mint. 



Aromatic fragrant perennial herbs; flowers very small, in 

 dense clusters, forming false whorls in the axils or in terminal 

 spikes; calyx bell-shaped or tubular, 5-toothed, equal or nearly 

 so; corolla with a short included tube, almost equally 4-cleft, the 

 upper lobe broadest, entire or notched; anther-bearing stamens 

 4, equal, erect, distant. 



Whorls of flowers all axillary. M. canadensis, 



Whorls of flowers in terminal spikes or some in the upper axils. M. spicala. 



Mentha canadensis borealis (Michx.) Piper. Erect, simple or branched, 

 20-40 cm. high; stems usually simple, glabrous except in the angles; leaves 

 ovate or broadly lanceolate, mostly acute, rounded or cuneate at the base, 

 sharply serrate, short-petioled, glabrous; flowers in dense sessile axillary 

 clusters; calyx 2-3 mm. long, the triangular acute teeth short; corolla pale- 

 violet, rarely white, 5 mm. long, its lobes rounded, its tube exceeding the 

 calyx. Low ground, common. 



Mentha canadensis lanata Piper. Similar to M. canadensis borealis but 

 the stems and leaves downy or woolly with white hairs. Spokane County 

 and adjacent Idaho. 



Mentha spicata L. Green and glabrous throughout, the stems 30-60 cm. 

 high, simple below the inflorescence; leaves oblong-lanceolate, acute or 

 acuminate, serrate, narrowed to a sessile or short-petioled base, 2-5 cm. long; 

 spikes terminal, narrow, the flowers in interrupted whorls; bracts lanceolate, 

 usually ciliate; calyx hairy, the tube campanulate, little longer than the sub- 

 ulate teeth ; corolla purple, its tube exceeding the calyx. Sparingly introduced. 



