570 



SCIENTIFIC AND APPLIED PHARMACOGNOSY 



formed into menthol. This oil also contains : Phellandrene, limonene, 

 cadinene, acetic acid and iso-valerianic acid. 



FIG. 240. 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. 7, sphere 

 crystals (sphaerites) of a carbohydrate found in the corolla and style. J, 

 pollen grains. 



JAPANESE PEPPERMINT oil is obtained from Mentha arvensis 

 piperascens. The oil has a bitter taste and consists of free men- 



