470 POWDERED VEGETABLE DRUGS 



170. (Fig. 165.) RUMEX. Rumex. 

 Fl. ex. 30. 



Yellow Dock, E. Grindwurzel, Mengelwurzel, G. Racine patience 

 frise*e, Fr. 



The roots of Rumex crispus L., and other species, Polygonacese. 



Brown. 



Somewhat aromatic; nearly odorless. 



Very bitter and astringent. 



Thin- walled brown cork tissue. Parenchyma cells large; thin- 

 walled, loosely united, filled with granular matter and simple, elliptical, 

 oval and egg shaped starch granules. Rather large aggregate crystals 

 of calcium oxalate abundant. Yellow brown sclerenchyma cells, 

 somewhat variable in thickness of walls and in form. Bast, tracheids 

 and reticulate ducts. 



Related species of dock (Rumex) are subtituted for the above. 



