288 



FOREST TREES OF THE PACIFIC SLOPE. 



Longevity. — Very little is known of the age attained. Believed to be long- 

 lived. Trees from 14 to 20 inches in diameter are from 175 to 280 years old. 

 Owing to the decayed heart of large trees it is exceedingly difficult to determine 

 their age. 



Fig. 128. — Quercus douglaaii. 



RANGE. 



California. — Foothills of coast ranges and west slope of Sierras from Mendocino 

 County and mountains south of Mount Shasta southward to Santa Ynez and Tehachapi 

 mountains and to borders of Mohave Desert. In coast ranges, common on lower foot- 

 hills of inner mountains and rare in valleys; extends westward and northward to east 



