FOREST TREES OF THE PACIFIC SLOPE. 255 



belongs the credit of finally separating this tree from the red-brown or bronze 

 harked tree i />'. fontinalis Sarm-nt) nt' the sierra ami Rocky Mountain regions, 

 and also from the paper birch, B. papyrifera, a form of which was thought to 



Fig. 111. — Bctu.la occidental in: a, fruiting twig; b, cone scale; c, d, seed, natural sizo and 



enlarged. 



occur in British Columbia and Washington. The latter, a more eastern and far 

 northern tree, is not known to reach the range of the western birch. 



