. Vegetation of Oregon and Washington. Botany Oregon Ecology; Botany Washington (State) Ecology. Figure 106. — Better drained pumice soils in south- central Oregon typically have dark- colored Al and AC horizons overlying the lighter colored gravelly C; note the abrupt boundary between Mazama pumice and buried soil. Figure 107. — The Pinus contorta/Purshia tiidentata community is widespread in the central Oregon pumice region; Pinus contorta achieves climax status on poorly drained sites and in frosty depressions in this area (Pringle Falls Research Natural Area, Deschutes National Forest, Ore
. Vegetation of Oregon and Washington. Botany Oregon Ecology; Botany Washington (State) Ecology. Figure 106. — Better drained pumice soils in south- central Oregon typically have dark- colored Al and AC horizons overlying the lighter colored gravelly C; note the abrupt boundary between Mazama pumice and buried soil. Figure 107. — The Pinus contorta/Purshia tiidentata community is widespread in the central Oregon pumice region; Pinus contorta achieves climax status on poorly drained sites and in frosty depressions in this area (Pringle Falls Research Natural Area, Deschutes National Forest, Oregon).. 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 Franklin, Jerry F. cn; Dyrness, C. T. Portland, Or. : Pacific Northwest Forest and Range Experiment Station, U. S. Dept. of Agriculture
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