LEAVES. 



55 



PLATE XXI. 



n 



FIG. 31. Powdered Belladonna Leaves (x 240). 



c.cr, Cells with sandy crystals. 



co, Collenchymatous cells from cortical tissue of midrib. 



ei, Epidermis of under surface. 



en, Epidermis over the veins, with striated cuticle. 



es, Epidermis of the upper surface, with striated cuticle and occasional 

 stomata. 



I, Bast. 



me, Branching cells of spongy parenchyma. 



nv, Fragment of small vein. 



pa., Palisade cells, surface view. 



p'a , Palisade cells, in longitudinal section. 



pg, Glandular hairs, long and short, with unicellular and pluricellular 

 glands. 



st, Stomata, surrounded by three or four cells, one of which is smaller than< 

 the others. 



tf, Cortical tissue of the midrib. 



tn, v, Tracheids and vessels. 



