34 WEST-AMERICAN 



Western Sierra foothills, usually spire-shaped; cones 

 smaller and narrower than the preceding. 



ROCKY MT. YELLOW PINE. Var. (c) scopulorum, Engelm. 



Trees of the Rocky Mountains, westward to the 

 eastern slopes of the Sierra Nevada and Cascade 

 Mountains. The principal lumber tree of the Rocky 

 Mountains. Leaves often in pairs and remaining on 

 the limbs several years. 

 No. 15 Black Pine P. Jeffreyi, Murray. 



Chiefly distinguished from the ponderosa species 

 (with which it is often associated) by the trees affect- 

 ing usually more elevated regions, and having darker, 

 finer-checked bark and longer, out-reaching limbs; the 

 young branchlets and leaves are slightly colored by 

 a whitish powder; also, when broken, they exhale a 

 pleasant, aromatic odor like that of orange; cones 

 large, 6 to 10 inches long, ovate, with strong prickles. 

 Male flowers, larger, 3 to 4 lines in diameter, but 

 shorter, 1 to 2 inches, forming dense rosettes or heads 

 with a leaf-bud or a few leaves in the center. 



Trees of higher localities from Western Montana 

 through Idaho, Oregon and California to the penin- 

 sula of Lower California; particularly abundant on 

 the Southern Sierra and the San Bernardino Moun- 

 tains. First detected by Jeffrey, near Mt. Shasta, 

 1852. Trees of this pine, near Oroville, Cal., are 

 tapped annually, and large quantities of pitch ob- 



