VEGETABLE POWDERS 



501 



Fig. 181. Ruellia ciliosa roots and rhizomes. This constitutes the most common 



adulterant of Spigelia martiandica. 

 a. Outer parenchyma, two cells with cystoliths. 

 6. Sclerenchyma cells. 



c. Parenchyma cells, longitudinal view. 



d. Cork tissue. 



e. Tracheids. 



