LABIATE 105 



flowers very large, violet with yellowish -white lower lip, 

 solitary in the axils of ovate membranous bracts, forming 

 a dense terminal spike; alpine pastures, rare; South- 

 western Switzerland, Piedmont, Dauphiny, Pyrenees. 



17. Leonurus, L. 



Flowers small, pink or white, in dense axillary cymes ; 

 calyx turbinate, truncate, with five triangular spreading 

 teeth ; corolla 2-lipped, upper lip entire ; stamens 4. Not 

 alpine. 



L. Cardiaca, L., Mother-wort ; flowers pink, upper lip of 

 corolla villous, stem 2-4 ft., very leafy, lower leaves pal- 

 matifid, upper 3-lobed ; waste places. 



18. Marrubium, L. 



Flowers small, in dense cymes in the axils of leaf-like 

 bracts ; calyx tubular, S-io-toothed ; corolla short, upper 

 lip erect ; stamens 4. Not alpine. 



M. vulgare, L., Horehound ; strongly fragrant, flowers 

 white, leaves thick, cordate-ovate, wrinkled, hoary like 

 the stem ; waste places. 



19. SiDERlTIS, L. 



Cymes forming an elongated spike; corolla 2-lipped; 

 calyx-teeth ending in spines ; stamens 4. 



S. hyssopifolia, L. ; spike short, ovoid, continuous; 

 flowers pale yellow ; leaves elliptical or linear-lanceolate, 

 nearly entire, stem woody, 4-12 in. ; rocky places; Jura, 

 Piedmont, Dauphiny, Pyrenees. 



