OBSERVATIONS ON THE BIRCH. 
25 
those mountains, which appears to be the Betula fruti- 
cosa of Pallas, first found in Siberia. 
In the Rocky Mountains, besides the two species 
now described, we met with the Betula glandulosa, which 
is also found on the high mountains of the United 
States. 
Canoe Birch, or Paper Birch, ( Betula papyracea .) 
This very useful species of Birch to the aborigines of 
the north, is found, according to the observations of 
Dr. Richardson, as far as the 65th degree of latitude. 
White Birch, ( Betula populifolia .) Hooker very 
justly remarks the near affinity which this species bears 
to the common European Birch, (B. alba.) The general 
aspect is the same. In our plant, however, the leaves 
have longer acuminated points, and smaller fertile cat- 
kins. The scale of the same catkin in ours, is also 
comparatively smaller and shorter clawed, with the 
middle lobe acute and much smaller than the lateral 
lobes, whereas, in the European Birch, the lobes are 
nearly all equal and obtuse. 
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