Handbook of Tkees of the Xoetheen States and Canada. 



The Yellow Pine of tlie Rocky Mountain 

 region is usually a. medium size tree of from 

 50-70 ft. in height with trunk from 1-2 ft. 

 in diameter, but where conditions are par- 

 ticularly favorable attains the height of 100 

 to 125 ft., with trunk 3-4 ft. in diameter. The 

 bark of tlie younger trunks is dark and fis- 

 sured into rather firm scaly ridges but these 

 flake oflf with age and the bark of old trunks 

 is more of a cinnamon-red color and broken 

 into large scaly plates. It develops a distinct 

 pyramidal head at first and by the gradual 

 lengthening of the lateral branches finally a 

 broad rounded top. It occupies well-drained 

 uplands and mountain slopes, being particu- 

 larly abundant in the Black Hills of Dakota, in 

 northwestern Nebraska and on the mountains 

 of Colorado at altitudes ranging from six to 

 ten thousand feet. On the Colorado plateau 

 of northern Arizona and New Jle.xico it forms 

 vast and valuable forests. 



Its peculiarity in having leaves both in 

 clusters of two and three is e.\ceptional to the 

 usual habit of the Pines. 



The wood is rather hard, heavy and strong 

 and useful for lumber for general construc- 

 tion purposes, interior finishing, etc. 



Leaves both in clusters of 2 and ;>, .3-6 in. long, 

 rigid, with sheaths at first close and about V2 in. 

 long but finally loose and shorter, stomatite"rous 

 all sides and containing 2 Hhro-vascular bundles 

 and 2-5 resin-ducts within the parenchyma. 

 Flowers: staminate about 1 in. long. Fruit: 

 cones 2-4 in. long, ovoid, deciduous above the 

 lowest basal scales, somewhat oblique with scales 

 thickened at apex and covered with slender 

 strongly recurved prickles : seed ^4 in. long with 

 ample wing broadest in the center. 



1. Syn. P. Scopulrjriim Lem. 



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