LABIATA: 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, 5—10-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. SIDERITIS, 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. 
