536 POWDERED VEGETABLE DRUGS 



207. (Fig. 199.) VIBURNUM PRUNIFOLIUM. 

 Black Haw. U. S. 



Fl. ex. 60. 



Sweet viburnum, E. Amerikanische Schneeballenbaumrinde, G. 



The bark of Viburnum prunifolium L., Caprifoliaceae. 



Light reddish brown. 



Aromatic, valerian-like odor. 



Bitter, somewhat astringent. 



Outer rather large-celled cork. Outer portion of middle bark of 

 tangentially flattened cells bearing some starch. Inner parenchyma 

 bearing numerous aggregate and prismatic crystals of calcium oxalate. 

 Numerous yellowish, thick-walled, porous sclerenchyma cells, some of 

 which are branching. No bast, but some wood fibers from the wood 

 are to be found. 



Ash 7.5 per cent. 



Bark may be gathered out of season and may contain admixtures 

 of other barks. 



