. Bulletin. Forests and forestry -- United States. PURE AND MIXED FOREST. 41 leaf trees aud conifeis. (See tig. 36 aud Pis. XX, XXI.) The line between gregarions aud scattered species is not always well marked, because it often happens that a tree may be gregarious in one place, and live with many others elsewhere. The Western Yellow Pine, which forms, on the plateau of central Arizona, perhaps the largest pure Pine for- est of the earth, is 1 frequently found growing with other species in the moun- tains, especially in the Sierra Xevada of central California. (See figs. 34, 35.) Trees which o
. Bulletin. Forests and forestry -- United States. PURE AND MIXED FOREST. 41 leaf trees aud conifeis. (See tig. 36 aud Pis. XX, XXI.) The line between gregarions aud scattered species is not always well marked, because it often happens that a tree may be gregarious in one place, and live with many others elsewhere. The Western Yellow Pine, which forms, on the plateau of central Arizona, perhaps the largest pure Pine for- est of the earth, is 1 frequently found growing with other species in the moun- tains, especially in the Sierra Xevada of central California. (See figs. 34, 35.) Trees which oc- cupy the ground to the exclusion of all others do so because they succeed better, under the condi- tions, than tlieir com- petitors. (See fig. 37.) It may be that they are able to get on with less water, or to grow on poorer soil, their rate of growth or power of re- production may be greater, or there may be some other reason why they are better fitted for their surroundings. But the gregarious trees are not all alike in their ability to sustain themselves in different situations, while the differences between some of the mixed-forest species are very marked indeed. Thus Black Waluut, as a. Fig. 39.—Sproats of Pitch Pine from the neigh- borhood of Toms Kiver, New 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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