CLASSIFICATION OF ANGIOSPERMS. 605 



ical characters of which closely resemble those of R. Purshianus. 

 The bark of this plant is also official. 



FIG. 333. A Cascara tree on University of Washington campus. After Johnson and 

 Hindman, Amer. Jour. Pharm., 1914, p. 389. 



The leaves of the shrub known as New Jersey Tea (Ceanothus 

 americanus) are said to have been used as a substitute for tea 

 during the Revolutionary times. This plant is found in the East- 



