236. BETULA OCCIDENTALIS Hook. 



Western Birch, Puget 'Sound Birch. 



TRANSVERSE SECTION 



MAIAL SECTION 



TANGENTIAL SECTION 



Ger. Westliche Birke. 



Bouleau occidental, 



?> Abedul occidental. 



Pvbl>JI n4 



de by Rwi 8. Hewfh, B. A. t Lw*.IU, N. V.. U. S. 



