The Trees of Wyoming. 



75 



(1) ROCK PINE. 



(Piutts scopulorum (Engelm.) Lemmon). 



"Under the Yellow Pines I house, 



When sunshine makes them all sweet scented. 

 An' hear among their furry boughs 

 The baskin' west-wind purr contented." Lowell. 



Description. Leaves in bundles of three (rarely two), 4 to 7 inches 

 long, slightly rough on the margins; cone 3 to 5 inches long, scales much 

 thickened at the outer end and bearing a sharp, recurved prickle. 



This is one of the largest trees of this state, attain- 

 ing a height of 75 to 125 feet and becoming 3 to 5 feet in 



V. ROCK PINE. Young and old cones and leaf-bundle. 



diameter. In some localities, however, as at Pine Bluffs 

 and in the Dakota Black Hills, only comparatively young 

 trees seem to be present. It is probably the hardiest and 

 most widely distributed, though not the most abundant. 



