. Bulletin. Forests and forestry -- United States. REPRODUCTIVE POWER OF TREES, 37 hollow below, and those on the upper slopes of a high mountain are commonly starved and stunted in com- parison with the vigorous forest lower down. (See PI. XVII.) The Western Chinquapin, which reaches a height of 150 feet in the coast valleys of northern California, is a mere shrub at high elevations in the Sierra Nevada. The same thing often appears in passing from the more temperate re- gions to the far north. Thus the Canoe Birch, at its north- ern limit, rises only a few inches above the ground, while fart
. Bulletin. Forests and forestry -- United States. REPRODUCTIVE POWER OF TREES, 37 hollow below, and those on the upper slopes of a high mountain are commonly starved and stunted in com- parison with the vigorous forest lower down. (See PI. XVII.) The Western Chinquapin, which reaches a height of 150 feet in the coast valleys of northern California, is a mere shrub at high elevations in the Sierra Nevada. The same thing often appears in passing from the more temperate re- gions to the far north. Thus the Canoe Birch, at its north- ern limit, rises only a few inches above the ground, while farther south it becomes a tree sometimes 120 feet in height. THE REPRODUCTIVE POWER OF Fig. l!5.—Western Yellow i'ine in mixture with other trees. Flat- head Valley, Montana. Another matter which is of the deepest interest to the forester is the reproductive power of his trees. Except in the case of sprouts and other growth fed by old roots, this depends first of all on the quantity of the seed which each tree bears; but so many other con- siderations affect the result that a tree which bears seed abundantly may not reproduce itself very well. (See fig. 30.) A part of the seed is always unsound, and sometimes much the larger part, as in the case of the Tulip Tree. But even a great abundance of sound seed does not always insure good reproduction. The seeds. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Division of Forestry. Washington : G. P. O.
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