524 POWDERED VEGETABLE DRUGS 



201. (Fig. 193.) ULMUS. Slippery Elm. U. S. 

 Moderately fine to quite fine. 



Elm bark, E. Ulmenrinde, Riisterrinde, G. Orme fauve, Orme 

 Champetre, Fr. 



The inner bark of Ulmus fulva Michx., Ulmacese. 



Very light brown. 



Odor of fenugreek. 



Very mucilaginous; tasteless. 



Bits of the outer bark are usually present, therefore brown cells 

 may be found, no sclerenchyma. Inner bark parenchyma cells com- 

 paratively small, thin- walled, rather closely united ; porous, elongated 

 sieve tube like elements, and medullary ray tissue plentiful. Numer- 

 ous very characteristic prismatic crystals of calcium oxalate; they 

 occur in twos, each crystal having a hilum-like dot in the middle. 

 Enormous mucilage cells. Starch deficient. Numerous bast fibers 

 with thick walls. 



Very frequently adulterated with flour. Compare -with U. cam- 

 pestris and U. Americana. 



