CRUDE DRUGS. 



523 



the younger bark the meckillary rays are from 4 to 7 cells wide ; 

 otherwise the pieces resemble Frangula. 



Fig. 229. Bark of Rhammis Purshiana showing large whitish patches of lichens, 

 and numerous lens-shaped lenticels. 



RHAMNUS PURSHIANA. CASCAR A SAGRADA. 

 The bark of Rhamnns Purshiana (Fam. Rhamnaceae), a shrub 

 indigenous to Northern California, Washington, Oregon and the 



