CLASSIFICATION OF ANGIOSPERMS. 



369 



both being deeply bilabiate. Only the two anterior stamens are 

 fertile (bear anthers) ; the connective is transverse, the upper 



Fig. 175. 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 (spheerites) of 

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



end bearing a perfect pollen-sac and the lower, a somewhat 

 enlarged rudimentary pollen-sac (Fig. 84, F). 



Hcdcoma pulegioides (American pennyroyal) (see p. 628). 



