118 Merriam A New Fir from Arizona. 



of lasiocarpa. Abies arizonica is a much smaller tree than A. 

 lasiocarpa. 



Both are highly boreal species, belonging to the Hudsonian 

 Zone, though A. arizonica fails to reach the upper or timber-line 

 belt of this zone. Abies lasiocarpa ranges from southern Alaska 

 and British Columbia southward, over the Rocky Mountains into 

 Utah and Colorado, and over the Cascade Range to southern 

 Oregon. Abies arizonica, on the other hand, is restricted, so far 

 as known, to San Francisco Mountain and neighboring peaks on 

 the summit of the plateau in northern Arizona. 



