248 



FOREST TREES OF THE PACIFIC SLOPE. 



years old ; one tree 431 inches in diameter showed an age of 112 years. The 

 much larger trees — now very largely cut for lumber — would doubtless show 

 ages of 150 or 175 years. 



-Fig. 108. — Populus trichocarpa. 



RANGE. 



Coast ranges of southern Alaska and southward through interior Yukon Territory, 

 British Columbia, Washington, and Oregon, to southern California (San Jacinto Moun- 

 tains) ; reported also in northern Idaho and Montana. Northern range still imperfectly 

 known. 



