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• and Colorado violet (Viola scopulorum) were also important. Native perennial cool season <br />grasses averaged 9.2 percerit of total vegetation cover. Agassiz bluegrass contributed half <br />to this average. Slender wheatgrass (Elvmus trachvcaulus ssp. trachvcaulus) was also <br />important. Introduced annual and biennial (orbs, primarily hound's tongue (Cvnoglossum <br />officinale), averaged 3.6 percent of the total vegetation cover. Quaking aspen (Po ulus <br />tremuloides), a native tree, averaged 1.4 percent of total vegetation cover. <br />Total vegetation cover averaged 84.4 percent. Litter, and bare soil cover averaged 9.8, and <br />5.8 percent, respectively. Species density averaged 38.2 species per 100 sq. m. <br />Herbaceous Production (Table 5) <br />Total herbaceous production for all species averaged 977.8 pounds per acre. No alfalfa <br />was observed in this native reference area. <br />Sagebrush Reference Area (Photographs 6, 9, and 10) <br />• Cover (Table 6) <br />Native perennial cool season grasses averaged 36.7 percent of total vegetation cover. <br />Sheep fescue accounted for over half of this average. Together slender wheatgrass and <br />Agassiz bluegrass contributed nearly all of the balance. <br />Native shrubs averaged 35.2 percent of total vegetation cover. Big sagebrush accounted <br />for just over half of this average, and mountain snowberry accounted for nearly all of the <br />balance. Native perennial (orbs averaged 25.9 percent of total vegetation cover. One-flower <br />woodsunflower (Helianthella uniflora), and Pacific aster (Virgulaster ascendens) were this <br />life form's major cover contributors. Weedy milkvetch (Astragalus miser var. oblongifolius), <br />showy fleabane (Erigeron sgeciosus), and western yarrow were also important. Arrowleaf <br />balsamroot (Balsamorhiza sagittata), fringed thistle (Cirsium centaureae), and common <br />yampa (Perideridia gairdneri ssp. borealis were relatively minor contributors. <br /> <br />10 <br />