Forest trees of the Pacific slope . Fig. 192.—Rhamnus purshiaiia, northern form. demand for bark both in this country and in Europe. Large numbers of treesare destroyed annually by peeling. The cut stumps sprout vigorously, so that,with consei\ative management the supply can be maintained. An investigation looking to such management is now under way. 406 FOREST TREES OP THE PACIFIC SLOPE, LoKGKViTY.—Not fully determined for large trees. Those from 6 to 12 inchesin diameter are from 18 to 40 years old. when grown in dense stands, but Fig. —Rhamnus purshiana. southern form.
Forest trees of the Pacific slope . Fig. 192.—Rhamnus purshiaiia, northern form. demand for bark both in this country and in Europe. Large numbers of treesare destroyed annually by peeling. The cut stumps sprout vigorously, so that,with consei\ative management the supply can be maintained. An investigation looking to such management is now under way. 406 FOREST TREES OP THE PACIFIC SLOPE, LoKGKViTY.—Not fully determined for large trees. Those from 6 to 12 inchesin diameter are from 18 to 40 years old. when grown in dense stands, but Fig. —Rhamnus purshiana. southern form. RANGE. From Iuget Sound southward into Lower Oalifornia ; eastward throush northernWashington to Idaho (Bitter Uoot Mountains), Montana (Flathead Lake) ; eastern slopesSierra Nevada Mountains; mountains of Colorado, Arizona, New Mexico, and westernTexas. POEEST TREES OF THE PACIFIC SLOPE. 407 OCCURRENCE. Low river bottoms, flats, valleys, borders of slow streams (at north), and high foothillslopes (southward) ; in former habitat in rich, rocky, or humous soils (best growth) andin dry gravelly or sandy soils throughout southern range (here shrubby) ; abundantmoisture and rich soil required for largest growth. Mixed (usually as an undergrowth)with Douglas fir, red alder, western red cedar, hemlock, broadleaf and vine maples,Oregon crab, in alluvial bottoms, but often with manzanitas, live oaks, chaparral brushelsewhere on open hill slopes. CLiiM.\Tic Conditions.—Similar to those of red alder and Douglas fir. Tolerance.—Exceedingly toler
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectforestsandforestry
