154 Flora of the Palouse Region 



the calyx, nearly equally 4-lobed: anther-bearing stamens 2, dis- 

 tant; the upper pair either sterile or wanting. 



L. americanus Muhl. Glabrous or puberulent: stems erect, simple or 

 little branched, 30-60 cm. high, from creeping rootstocks: leaves lanceolate 

 or ovate-lanceolate, acuminate or acute, cuneate at base, coarsely serrate or 

 sinuately incised, 2-5 cm. long; petioles short: flowers sessile, in dense axil- 

 lary whorl-like clusters: calyx-teeth triangular-acuminate, stiff, nearly as 

 long as the small white corolla, exceeding the nutlets: sterile stamens slen- 

 der, with thickened tips. Low ground. 



259. MENTHA. 



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. 



Plants glabrous, at least below. M. yiridis. 



Plants pubescent. M. CANADENSIS. 



L. viridis 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, usu- 

 ally ciliate: calyx hairy, the tube campanulate, little longer than the subu- 

 late teeth: corolla purple, its tube exceeding the calyx. Sparingly intro- 

 duced. 



M. canadensis L. Erect, simple or branched, 20-40 cm. high, puberu- 

 lent or sometimes soft-pubescent: leaves ovate or broadly lanceolate, mostly 

 acute, rounded or cuneate or base, sharply serrate, short-petioled: 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 and variable. 



Family 68. SOLAN ACE AE. 



Herbs or shrubs, commonly rank-scented, with colorless juice: 

 leaves alternate, without stipules: flowers regular, 5-merous, soli- 

 tary or in cymes, on bractless pedicels: calyx mostly 5-lobed: cor- 

 olla gamopetalous, mostly 5-lobed, usually plaited in the bud: 

 stamens as many as the corolla-lobes and alternate with them: 

 style 1; ovary entire, superior, 2-celled, becoming a many-seeded 

 capsule or berry; endosperm fleshy. 



Corolla rotate. 260. solan cm. 

 Corolla funnelform to salverform. 



Flowers solitary. 261. datura. 



Flowers in racemes or panicles. 262. NICOTIANS, 



