448 POWDERED VEGETABLE DRUGS 



156. (Fig. 153.) POPULUS. Populus. 

 Fl. ex. 60. 



White poplar bark, Silver poplar bark, E. Zitterpappelrinde, G. 



The bark of Populus tremelloides Mich., Salicacese. 



Bright pale yellow. 



Nearly odorless. 



Bitter. 



Some parenchyma and cork cells. Sclerenchyma cells with thick, 

 finely porous walls and irregular sclerenchymatous fibers. Rather 

 thick-walled, porous bast fibers and crystal-bearing fibers. Many 

 layered medullary rays. 



