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• contributed more than one-tenth of this total. Chokecherry, bitterbrush, and Wood's rose <br />accounted for the balance. <br />Aspen Extended Reference Area <br />(Photographs 9 through 12) <br />Cover (Table 7) <br />The native tree, quaking aspen (Populus tremuloides), was the dominant species in this area and <br />contributed 50.4 percent of total vegetation cover. Native shrubs accounted for 25.6 percent of <br />total vegetation cover. Saskatoon serviceberry contributed three-fifths of this total. Mountain <br />snowberry, Rocky Mountain maple (Acerglabrum) and chokecherry also made measurable <br />contributions. Native perennial forbs accounted for 14.2 percent of total vegetation cover. <br />Western aniseroot (Osmorhiza occidentalis) and serrate groundsel (Senecio sen-a) each <br />contributed approximately one-fifth of this total. Cutleaf coneflower (Rudbeckia ampla) and <br />stinging nettle (Urtica gracilis ssp. gracilis) each comprised one-twentieth of this total. Fifteen <br />other species made relatively minor contributions to total vegetation cover. Native perennial cool <br />season grasses accounted for 8.2 percent of total vegetation cover. Blue wildrye (Elymus <br />glaucus) was the dominant species in this lifeform. Canada brome (Bromopsis canadensis) and <br />Agassiz bluegrass were also present in measurable quantities. Hound's tongue, an introduced <br />biennial forb, averaged 1.1 percent of total vegetation cover. Douglas knotweed (Polygonum <br />douglasir), a native annual forb, and Canada thistle, an introduced perennial forb, each <br />contributed 0.2 percent of total vegetation cover. <br />Total vegetation cover was 90.0 percent. Standing dead, litter, and bare soil cover values were <br />1.8, 6.2, and 2.0 percent respectively. Species density averaged 27.7 species per 100 sq. m. <br />• Herbaceous Production (Table 8) <br />Total herbaceous production for all species was 830 pounds per acre. No alfalfa was observed in <br />this reference area. <br />Mountain Brush Extended Reference Area <br />(Photographs 13 through 16) <br />Cover (Table 9) <br />Native shrubs comprised 68.3 percent of total vegetation cover in this reference area. Gambel's <br />oak accounted for nearly two-thirds and mountain snowberry averaged nearly one-quarter of this <br />total. Saskatoon serviceberry, Douglas rabbitbrush (Chrysothamnus viscidiflorus), chokecherry, <br />and big sagebrush were also present in measurable quantities. Native perennial cool season <br />grasses (and grass-likes) averaged 19.9 percent of total vegetation cover. Agassiz bluegrass <br />contributed more than one-third of this total. Elk sedge (Carex geyen) and slender wheatgrass <br />were also important species in this lifeform. Six other species made relatively minor <br />contributions. Native perennial forbs contributed 10.1 percent of total vegetation cover. Silver <br />lupine (Lupines argentus), American vetch, and Pacific aster (Virgulaster ascenders) each <br />contributed approximately one-fifth of this total. Nine other species made relatively minor <br />contributions. Hound's tongue (Cynoglossum officinale), an introduced biennia! forb, averaged <br />1.1 percent of total vegetation cover. Smooth brome, an introduced perennial grass, contributed <br />0.5 percent of total vegetation cover. <br />Total vegetation cover was 73.2 percent. Standing dead, litter, bare soil, and rock averaged 1.0, <br />18.6, 6.8, and 0.4 percent respectively. Species density averaged 29.8 species per 100 sq. m. <br />Herbaceous Production (Table 10) <br />• Total herbaceous production for all species was 998 pounds per acre. No alfalfa was observed in <br />this reference area. <br />