FOREST TREES AND FOREST REGIONS OF THE U. S. 



45 



ROCKY MOUNTAIN FOREST TREES 



Northern portion: 



Northern Idaho and western 

 Montana: 



Lodgepole pine. 



Douglas fir. 



Western larch. 



Engelmann spruce. 



Ponderosa pine. 



Western white pine. 



Western red cedar. 



Lowland white and alpine 

 firs. 



Western and mountain hem- 

 locks. 



Whitebark pine. 



Balsam poplar (Balm-of- 

 Gilead). 

 Eastern Oregon, central Idaho, 

 and eastern Washington: 



Ponderosa pine. 



Douglas fir. 



Lodgepole pine. 



Western larch. 



Engelmann spruce. 



Western red cedar. 



Western hemlock. 



White, lowland white, and 

 alpine firs. 



Western white pine. 



Oaks and junipers (in Oregon). 

 Central Montana, Wyoming, and 

 South Dakota: 



Lodgepole pine. 



Douglas fir. 



Ponderosa pine. 



Engelmann spruce. 



Central Montana, Wyoming, and South 

 Dakota — Continued. 

 Alpine fir. 

 Limber pine. 

 Aspen and cottonwood. 

 Rocky Mountain red cedar. 

 White spruce. 

 Central portion (Colorado, Utah, and 

 Nevada) : 



Lodgepole pine. 



Engelmann and blue spruces. 



Alpine and white firs. 



Douglas fir. 



Ponderosa pine. 



Aspens and cottonwoods. 



Pinon and singleleaf pinon. 



Rocky Mountain red cedar and 



Utah juniper. 

 Bristlecone and limber pines. 

 Mountain mahogany. 

 Southern portion (New Mexico and 

 Arizona) : 



Ponderosa pine. 

 Douglas fir. 



White, alpine, and corkbark firs. 

 Engelmann and blue spruces. 

 Pinon and Mexican pinon. 

 One-seeded and alligator junipers 

 and Rocky Mountain red cedar. 

 Aspen and cottonwoods. 

 Limber, Mexican white, and Ari- 

 zona pines. 

 Oaks, walnut, sycamore, alder, 



boxelder. 

 Arizona and smooth cypresses. 



PACIFIC COAST FOREST REGION 



Stands of very large firs, pines, hemlock, and cedars characterize 

 the Pacific coast forest region. These are dense in the coastal forests 

 of Washington and Oregon. In the extreme southern portion, in 

 southern California, the timbered lands are surrounded with margins 

 of a dense growth of dwarf broadleaf trees known as " chaparral. " 



The big trees, or Sierra redwoods, of the Sierra Nevada mountains 

 in central-eastern California, reach enormous heights of over 300 feet 

 and diameters up to 40 feet, and single trees contain up to 360,000 

 board feet of lumber. Another large tree is the coast redwood of 

 the low coastal mountain ranges of central and northern California. 

 One such coast redwood measuring 364 feet in height is reported to 

 be the tallest living tree in the United States. The western red 

 cedar, Douglas fir, and sugar pine of California all grow to heights 

 of over 200 feet with diameters up to 12 to 15 feet (pi. 9). The 

 western red cedar averages the largest of this group. Douglas fir, 

 somewhat smaller, and sugar pine, with its thin rather smooth bark, 

 range mostly from 6 to 9 feet in diameter. About four-fifths of the 

 total standing saw timber of the country is found west of the Great 



