178 



PLANT ORGANS OR PARTS OF PLANTS. 



Fig. 44. — General Structure of Leaf. 

 I, Cross-section: e, e' , Epidermis; p, palisade cells; K, crystals in 

 mesophyll; /t, simple hairs; S, glandular hairs. 77, Superficial view of 

 leaf: jv. Spiral vessel; p, parenchymatic cells, with oval stomata and 

 wavy outlines of epidermal cells; K, crystals. 777, Glandular hairs 

 greatly enlarged. 



