222 POWDERED VEGETABLE DRUGS 



19. (Fig. 38.) ARNICA. Arnica. 



Roots, Rhizomes and some Leaves. 



Fl. ex. 60. Tinct. 40. 



Origin and names as for the preceding. 



The roots and rhizomes are prescribed but the basal branches 

 and leaves are generally included. 



Very dark brownish gray. 



Very faintly aromatic or fragrant, recalling odor of hay. 



Bitter, pungent. 



Trichomes, pollen grains and epidermal cells as for the flower 

 but more sparingly present. In addition, the parenchymatous and 

 vascular tissue of roots, leaf stalks and stems; parenchymatous 

 cells typical, free from any characteristic contents; ducts and tracheids 

 porous; some spiral vessels. Epidermal cells of leaf with wavy vertical 

 walls. 



Ash about 9 per cent. 



Adulterated with roots and rhizomes, of other species and the roots 

 and rhizomes of the strawberry. 



