. Characteristics and hybridization of important intermountain shrubs. Compositae Rocky Mountains; Shrubs Rocky Mountains; Sunflowers Great Basin; Shrubs Great Basin. Figure 45.—Differential deer browsing on subspecies of rubber rabbitbrush on Bald Mountain^ Sanpete Co., Utah. The dxxrk plant (lower left) is the threadleaf rubber rabbitbrush (C. nauseosus ssp. consimilis/'j wheareas the light plant (center) is white rubber rabbitbrush (c. nauseosus ssp. albicaulisJ. permanent, dense, white to grayish tomentum (fig. 47). The leaves are to 4 cm long, to mm wide or sometimes to 3 mm w
. Characteristics and hybridization of important intermountain shrubs. Compositae Rocky Mountains; Shrubs Rocky Mountains; Sunflowers Great Basin; Shrubs Great Basin. Figure 45.—Differential deer browsing on subspecies of rubber rabbitbrush on Bald Mountain^ Sanpete Co., Utah. The dxxrk plant (lower left) is the threadleaf rubber rabbitbrush (C. nauseosus ssp. consimilis/'j wheareas the light plant (center) is white rubber rabbitbrush (c. nauseosus ssp. albicaulisJ. permanent, dense, white to grayish tomentum (fig. 47). The leaves are to 4 cm long, to mm wide or sometimes to 3 mm wide in a few forms (fig. 48a). The strongly keeled, acute involucral bracts (fig. 38a) are white, more or less tomentose, 8 to 10 mm long, and arranged into 5 distinct vertical ranks. The yellow corollas are 8 to 11 mm long and terminate in lobes 1 to 2 mm long. The achenes are densely pubescent. IVhite rubber rabbitbrush is a common and widespread subspecies found in open places in plains and foothills from British Columbia and Montana southward to northwestern Colorado, Utah, Nevada, and eastern California. It is most abundant in the Great Basin area (Hall and Clements 1923). This subspecies is often found intermixed with ssp. graveolens on foothill ranges, and with ssp. consimilis in valleys and plains (Plummer 1977). The striking white forms have potential use as ornamentals. Chrysotharmus nauseosus ssp. consimilis (threadleaf rubber rabbitbrush) may reach 3 m in height when mature (fig. 49). It has leafy, erect branches covered with a green to yellow-green dense tomentum. The very narrow threadlike (linear-filiform) leaves are less than 1 mm wide and to 5 cm long (figs. 48b, 50). They are usually covered with a green to yellow-green tomentum and are somewhat resinous. When crushed, the leaves and twigs emit a strongly disagreeable odor. The involucral bracts are Please note that these images are extracted from scanned page images that may have been digitally
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