6;8 



A TEXT-BOOK OF BOTANY. 



strongly bilabiate, hairy calyx, and occur in axillary cymes. The 

 plant grows in the mountains of Southern France. The herb 



FIG. 372. Peppermint (Mentha piperita): B, portion of shoot showing petiolate leaves; 

 C, transverse section of leaf showing several forms of glandular hairs on lower surface, 

 loose parenchyma (m) and palisade cells (p); D, lower surface of leaf showing stoma (s) and 

 glandular hair (g). Spearmint (Mentha spicata) : A, portion of shoot showing flowers and 

 nearly sessile leaves; E, flower; F, outspread corolla showing cleft posterior lobe (p) and 

 the four adnate, included stamens; G, H, hairs from calyx; I, sphere crystals (sphaerites) of 

 a carbohydrate found in the corolla and style; J, pollen grains. 



contains from 0.3 to 0.9 per cent, of volatile oil, which is of a 

 dark reddish-brown color, and contains from 20 to 25 per cent, of 

 thymol ; and cymene, 1-pinene, borneol and linalool. The Spanish 



