. Characteristics and hybridization of important intermountain shrubs. Compositae Rocky Mountains; Shrubs Rocky Mountains; Sunflowers Great Basin; Shrubs Great Basin. Figure 20.—Saabland sagebrush (A. rigidaj growing at the Snow Field Station. The ruler is ZO am diploid (2n - 18) and tetraploid (2n = 36) forms of stiff sagebrush are known (Ward 1953; McArthur and Plummer 1978). This species resembles A. tripartita somewhat in its small size, silvery pubescence, and the deeply, narrowly lobed leaves, but may be distinguished by the spikelike inflorescence, large leaf
. Characteristics and hybridization of important intermountain shrubs. Compositae Rocky Mountains; Shrubs Rocky Mountains; Sunflowers Great Basin; Shrubs Great Basin. Figure 20.—Saabland sagebrush (A. rigidaj growing at the Snow Field Station. The ruler is ZO am diploid (2n - 18) and tetraploid (2n = 36) forms of stiff sagebrush are known (Ward 1953; McArthur and Plummer 1978). This species resembles A. tripartita somewhat in its small size, silvery pubescence, and the deeply, narrowly lobed leaves, but may be distinguished by the spikelike inflorescence, large leafy bracts that subtend the heads, and the deciduous leaves. sagebrush occurs in dry rocky scablands in the Columbia and Snake River basins and spills over into the northern end of the Great Basin. It grows at elevations from 910 to 1,520 meters (3,000 to 5,000 feet) in Idaho, central and eastern Oregon, and central and eastern Washington. It is adapted to the rocky scab- lands of these States and fills an ecological niche similar to that of A. arbusaula in the areas where it is found (Ward 1953) . Although several authors (Hall and Clements 1923; Davis 1952; Hitchcock and others 1969) include western Montana in the distribution of stiff sagebrush, neither Ward (1953) nor Beetle (1960) do. Wa^d (1953) claims the report of A. rigida from western Montana is probably a result of errors in identification. He identifies the specimens in this area as A. tripartita. Figure 21.—Leaves and branches of saabland sagebrush (A. rigida).. 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 McArthur, E. Durant; United States. Forest Service. cn. Ogden, Utah : Intermountain Forest and Range Experiment Station, Forest Service, U. S. Dept. of Agriculture
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