BETULACE^E 



219 



erally distributed, although nowhere very common: valley of the Saskatchewan (Saska- 

 toon), Saskatchewan, westward to the basin of the upper Fraser and Pease Rivers, British 

 Columbia, southward along the Rocky Mountains to eastern Utah, northern New Mexico 

 and Arizona, the valleys of the Shasta region and the eastern slope of the Sierra Nevada, 

 Dorthern California, and eastward in the United States to the eastern foothills of the Rocky 

 Mountains of Colorado, the Black Hills of South Dakota, and northwestern Nebraska. 

 Passing into 



Betula fontinalis var. Piped Sarg. 

 Betula Piperi Britt. 



A tree occasionally 50-60 high with a tall trunk 12'-18' in diameter, short spreading 

 branches, and usually longer and often narrower strobiles. 



Fig. 207 



Distribution. Spokane, Spokane County, Almota and Pullman, Whitman County, 

 eastern Washington. 



9. Betula Eastwood Sarg. 



Leaves broad-ovate to elliptic, acute, rounded or abruptly short-pointed at apex, coarsely 

 serrate except at the cuneate base, thick, glabrous, dark green above, pale below, reticulate- 



Fig. 208 



