. Characteristics and hybridization of important intermountain shrubs. Compositae Rocky Mountains; Shrubs Rocky Mountains; Sunflowers Great Basin; Shrubs Great Basin. Figure 44.—White rubber rabbitbrush (C. nauseosus ssp. albicaulisJ in a thick stand of grasses [(intermediate wheatgrass fAgropyron intermediumJ and crested wheatgrass (Agropyron cristatumj] at Pigeon Hollow3 Sanpete Co.^ Utah. Distribution and Habitat --Rubber rabbitbrush ranges from British Columbia and Saskatchewan south to western Texas, Baja California, and eastern California. It is a common plant on plains, valleys, and foo
. Characteristics and hybridization of important intermountain shrubs. Compositae Rocky Mountains; Shrubs Rocky Mountains; Sunflowers Great Basin; Shrubs Great Basin. Figure 44.—White rubber rabbitbrush (C. nauseosus ssp. albicaulisJ in a thick stand of grasses [(intermediate wheatgrass fAgropyron intermediumJ and crested wheatgrass (Agropyron cristatumj] at Pigeon Hollow3 Sanpete Co.^ Utah. Distribution and Habitat --Rubber rabbitbrush ranges from British Columbia and Saskatchewan south to western Texas, Baja California, and eastern California. It is a common plant on plains, valleys, and foothills. It grows best in openings within the sagebrush, juniper-pinyon, and ponderosa pine zones in sandy, gravelly, or clay- alkaline soils. This species grows at elevations ranging from 150 to 2,750 meters (500 to 9,000 feet). Rubber rabbitbrush vigorously invades disturbed sites such as readouts and over- grazed rangelands. On ranges where big sagebrush has been destroyed by fire, insects, vehicular traffic, or continued heavy grazing, rabbitbrush increases and often becomes the dominant vegetation (Evans and others 1973). Nevertheless, in most habitats, this species is not overly competitive with herbaceous species and on some sites it does not suppress grass. Production of herbaceous cover and percentage of site covered have been notably greater when rabbitbrush is present than when it is not present (Plummer 1959; Plummer and others 1968) (fig. 44). rabbitbrush is an excellent plant for controlling erosion because of its deep roots, heavy litter, and ability to establish on severe sites (USDA Forest Service 1974). Once established, this species reproduces easily and spreads fast from its light, plumed, wind-disseminated achene. It also grows vigorously when transplanted. When cut and divided the crown readily forms basal sprouts (Hall and Clements 1923). The value of C. nauseosus as browse varies greatly between subspecies and ecotypes. The white to grayis
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