id="pgepubid00009">WESTERN HEMLOCK (TSUGA HETEROPHYLLA).

Next to the Douglas fir the western hemlock is the most abundant tree in the forests of Oregon and Washington. It occurs from Alaska southward to northern California. About Mount Rainier it is found up to an altitude of 5,000 feet. In the river valleys in moist situations it is a large tree, sometimes reaching a height of 250 feet and a diameter of 5 feet. On the high ridges it is stunted. It grows best on moist deep soils in dense forests, but thrives under almost all conditions of soil and exposure if provided with plenty of moisture.

Western hemlock (figs. 6 and 7) is usually associated with Douglas fir and red cedar, but sometimes forms a forest of nearly pure growth. The hemlock produces abundant seed each year, although it is more prolific at irregular intervals. The seeds germinate readily on decayed moss and rotten wood as well as upon the mineral soil. Seedlings frequently grow on fallen logs and extend their vigorous roots around the side until they reach the ground and become firmly anchored in it. Young hemlocks thrive in the shade. On logged-off areas which have not been burned over and which are partially shaded by uncut trees, the reproduction of hemlock springs up, to the exclusion of the more valuable Douglas fir.

Fig. 6.—The lower slope forest, near Longmire Springs, altitude 3,000 feet, here composed largely of western hemlock (Tsuga heterophylla); the tree on the extreme left is a Douglas fir (Pseudotsuga taxifolia).

Photograph by A.H. Barnes.

The hemlock is long lived and grows slowly. The largest trees are from 200 to 500 years old and are usually hollow-hearted. The bark is thin and the tree very easily killed by ground fire. The wood of the hemlock is tough, light, and straight grained. It is not as durable as the Douglas fir and decays rapidly when exposed to the weather. The clear lumber is suitable for interior finish. The wood is also used for flooring, joists, lath, and paper pulp. The common and rough lumber does not find a ready market, except for the limited amount used in temporary construction. The western hemlock is, however, superior to the eastern hemlock, and its value will probably be recognized as its usefulness for many purposes becomes better known.

WESTERN WHITE PINE (PINUS MONTICOLA).

Fig. 7.—A forest of Douglas fir, with an understory of western hemlock, on the lower slopes of the hills, Mount Rainier National Park.

Photograph by A.H. Denman.

The western white pine (fig. 8) is found from southern Alaska to northern California. In the park it occurs occasionally up to 4,000 feet. It usually grows on level benches and gentle slopes associated with Douglas fir, western hemlock, and noble and amabilis fir. It reaches its best development at elevations of from 3,000 to 3,500 feet, where it attains a height of 150 feet and a diameter of 40 inches. The shaft is straight, cylindrical, and clear of limbs. It bears a small, narrow crown of drooping branches. In open areas, where it is exposed to sunlight, its mode of growth is wholly different. The trunk is short, rapidly tapering, and bears wide-spreading branches nearly to the ground. At high elevations the western white pine is very short and stunted.

Fig. 8.—Western white pine (Pinus monticola).
Diameter 24 inches, height 50 feet.

Although the western white pine is not a common tree in the park, it is often noticed on account of its abundance of slender, pendant cones, 6 to 10 inches long. They mature every two years and shed their seed early in September. The seed are provided with long wings and are often carried by the wind for a great distance from the parent tree.

The wood is light, soft, free from pitch, and the most valuable of any of the pines of the Cascades. It is used for interior finish, pattern making, and other purposes. The supply of this tree is so limited that it is not of great commercial importance in the Mount Rainier region.

AMABILIS FIR (ABIES AMABILIS).[2]

Amabilis fir (figs. 9 and 10) ranges from southern Alaska to Oregon. It is abundant in the park at elevations from 2,500 to 5,000 feet on level bench lands, and gentle slopes with a northern exposure. It is rarely found in unmixed stands, but is usually associated with western hemlock, Douglas fir, and noble fir. The largest trees are 150 to 180 feet high and 3 to 5 feet in diameter. In dense forests the stem is free from branches for 50 to 100 feet.

Fig. 9.—Amabilis fir (Abies amabilis).

At altitudes over 4,000 feet, small amabilis firs often occur in clusters and open groves. The trunk is covered with branches which grow to the ground, turning downward and outward in long graceful curves, admirably adapted to withstand the pressure of the frozen snow. The foliage is a deep and brilliant green, forming a strong contrast to the dark-purple cones. The seeds ripen each year early in October. Like the seed of the other alpine species of trees that grow in the cold and humid climate of the high Cascades, they soon lose their vitality when stored in dry places. The amabilis fir is grown in Europe as an ornamental tree. Under cultivation it loses much of the natural grace and beauty which it acquired in adapting itself to the deep snows and long winters of its native environment.

Fig. 10.—The forests of western hemlock, amabilis fir, and other species, on the middle slopes of the mountains, along the Crater Lake trail, Mount Rainier