Handbook of Trees of the Northern States a>M) Canada. 



The Yellow Pine of tlio 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 favoral)Ie attains the height of 1(»() 

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

 bark of tlie younger trunks is dark and fis- 

 sured into rather lirni scaly ridges but these 

 flake off 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 Xew ^lexico it forms 

 vast and valuable forests. 



Its peculiarity in having leaves both in 

 clusters of two and three is exceptional 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 finisliing, etc. 



Leaves both in clusters of 2 and .S, .3-6 in. lonir, 

 rigid, with slieatlis at first close and about i^ in. 

 long but finally loose and shorter, stomatifcroiis 

 all sides and containing 2 flbro-vascular Ijundb's 

 and 2-.'> resin-ducts within the parenchyiiia. 

 FloH'rrs: staminate about 1 in. long. Fruit: 

 cones 2-4 in. long, ovoid, deciduous al)ove I lie 

 lowest basal scales, somewhat olili(|ue with sc-iles 

 thickened at apex and cdvered with slender 

 strongly recurved prickles : seed 14 in. long with 

 ample wing broadest in the center. 



Syn. I'. Scot)iihjrum 



.em. 



M^O^.', .x^ 



