406 



FOREST TREES OF THE PACIFIC SLOPE. 



Longevity. — Not fully determined for large trees. Those from to 12 inches 

 in diameter are from 18 to 40 years old, when grown in dense stands, but not 

 overtopped. 



Fig. 193. — Rhamnus purshiana, southern form. 



RANGE. 



From Puget Sound southward into Lower California : eastward through northern 

 Washington to Idaho (Bitter Root Mountains), Montana (Flathead Lake) ; eastern slopes 

 Sierra Nevada Mountains ; mountains of Colorado, Arizona, New Mexico, and western 

 Texas. 



