The noble fir (figs. 11 and 12) is a common mountain tree in the western parts of Washington and Oregon. Like amabilis fir, it is usually called larch by lumbermen. About Mount Rainier it grows at elevations of from 3,500 to 5,000 feet in dense stands associated with amabilis fir, western hemlock, and Douglas fir. The noble fir avoids steep side hills and exposed situations. In moist soils on flats and gentle slopes it often reaches a height of from 150 to 200 feet. The tall and upright trunk supports a rounded crown of bluish green foliage, which is very noticeable among the purer green leaves of its associates. The branches are short, thick, and crowded with stiff, flattened leaves, which turn upward and outward. The light-green bract-covered cones are sometimes 6 inches long and nearly 3 inches thick. They ripen early in September. Seed is borne every year, although in some seasons it is much more abundant than in others.
[Illustration: FIG. 11.--Noble fir (_Abies nobilis_).]
[Illustration: FIG. 12.--Noble fir (_Abies nobilis_), 6 feet in diameter.]
The wood is strong, close grained, and elastic. It is used for lumber and particularly for inside finishing. The noble fir is a slow-growing and long-lived tree. Old trees in mixed forests are easily distinguished from the associated species by the ashy-brown outer bark broken into large irregular plates.
[Illustration: FIG. 13.--A cluster of Alpine firs (_Abies lasiocarpa_), whose spire-shaped crowns are characteristic, at 5,500 feet altitude, in Cowlitz Park, Mount Rainier National Park.
The alpine fir (fig. 13) ranges from Alaska to New Mexico. It is a common tree in the park at elevations above 4,500 feet. It is a tree of the high mountains and with the white bark pine and the mountain hemlock, is found up to the limit of arborescent life. It demands moisture and is generally restricted to regions of deep snowfall.
The alpine fir occurs in unmixed stands, but is often associated with the mountain hemlock. At the lower levels of its range it is a fair-sized tree 50 or 60 feet high. The crown of deep-green foliage is broad at the base and tapers to the top, where it terminates in a slender, pointed tip. At its upper limit it becomes a stunted shrub, with wide extended branches resting on the ground.