250 PLANT ORGANS AND PARTS OF PLANTS. 



COMPARISON OF PEA, BEAN, AND LENTIL. 



filled with starch grains. The starch grains are very 

 irregular, but are elongated oval, with lacerate elongated 

 hilum. They average 20 to 40 microns in short and 

 long diameters. 



The seed of the bean resembles that of the pea very 

 closely, but differs in a few important particulars. The 

 epidermal cells are palisade-like, as in the pea, but the 

 thickening of the cell walls is very characteristic. The 

 entire lumen of the epidermal cells is occluded save at 

 the base, where the walls become thinner. The palisade 

 cells are also shorter (30 by 60 microns). The hypoderm 



