526 POWDERED VEGETABLE DRUGS 



202. (Fig. 194.) UVA URSI. Uva Ursi. U. S. 

 Fl. ex. 30. 



Bearberry leaves, E. Barentraubenblatter, G. Busserole, Raisin 

 d'ours, Fr. 



The leaves of Arctostaphylos Uvaursi Sprengel, Ericaceae. 



Greenish brown. 



Somewhat fragrant. 



Very astringent, bitter. 



Epidermal cells, polygonal, upper larger than lower; large orbicular 

 stomata on lower surface only. Cuticle thick, yellowish. Leaf 

 parenchyma cells with oil globules. Prismatic crystals of calcium 

 oxalate. Thick-walled parenchymatous tissue. 



Ash 3.25 per cent. 



Adulterated with leaves of cowberry, red whortleberry,^sand 

 myrtle, box, trailing arbutus, and Chimaphila. 



