12 



THE CONIFERS OF THE NORTHERN ROCKIES. 



aspen, the box elder and the paper birch, besides a number of wil- 

 lows and lesser shrubs. 



FIG. 4. A forest of Lodgepole Pine in the Glacier National Park. August. 



With these two centers in mind as the contributors to our flora 

 in the most liberal way, there remain to consider some which are 



