Frangula purshiana ssp. purshiana   cascara, chittum bark
           (Alt: Rhamnus purshianus )
  
Rhamnaceae
native                      woody           
Distribution: Lucky Peak, Conifer Zone

UW Burke Herbarium Link: Frangula purshiana ssp. purshiana
USDA Plants Link: Frangula purshiana ssp. purshiana   (FRPUP)