540 POWDERED VEGETABLE DRUGS 



209. (Fig. 201.) XANTHOXYLUM. Prickly Ash. U. S. 



Fl. ex. 30. 



Toothache tree, Angelica tree, Suterberry, E. Zahnwehrinde, G. Clava- 

 lier, Frene e*pineux, Fr. 



The bark of Xanthoxylum Americanum Miller, Rutaceae. 



Light brown. 



Odorless. 



Very pungent, bitterish. 



Outer bark of cork with brown cell-contents. Collenchymatous 

 middle bark. Inner bark of parenchyma, of mostly elongated cells, 

 short crystal bearing cells and groups of phloem tissue; large yellow 

 resin bearing cells. Both prismatic and aggregate crystals of calcium 

 oxalate abundant. Yellow sclerenchyma cells and some bent, twisted 

 and somewhat branching bast cells. 



Ash 5 per cent. 



May be adulterated with bark of other species, Angustura and false 

 Angustura. 



