YELLOWSTONE NATIONAL PARK 15 



(brown) / ? u A (brown) 



WHITEBARK PINE DOUGLAS FIR 



Whitebark Pine (Pinus albicaulis). This is the 

 third of the three species of pine found in the Yellow- 

 stone Park. It grows only on the higher mountains 

 near the timber-line, and the only place in the Park 

 where it can be found close to an automobile road is 

 along Dunraven Pass and near the summit of Mount 

 Washburn. The tree is a white pine, with its needles 

 in bunches of five, but its most distinguishing mark is 

 the smooth, silvery-gray bark that persists even on 

 trunks and branches of considerable size. Like all 

 trees near timberline, the whitebark pine never be- 

 comes large, and it is frequently crooked and de- 

 formed. 



Douglas Fir (Pseudotsuga) . Next to the lodge- 

 pole pine, the Douglas fir is the most abundant tree 

 in the Park. It prefers moist canyons, hillsides, and 

 forests where other trees have already developed shel- 

 ter and shade. It is large, symmetrical tree, frequently 

 reaching a diameter of three or four feet, with many 

 branches. Like all firs and spruces, it bears its needles 

 singly instead of in bunches. An unmistakable fea- 

 ture, found in no other species, is the three-pointed 

 bract or appendage that projects over each scale of 

 the cone. 



