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• Sagebrush Reference Area <br />(Photograph 26) <br />Cover (Table 20) <br />Native shrubs averaged 40.7 percent of total vegetation cover. Together, mountain snowberry <br />and big sagebrush averaged 90 percent this total. Douglas rabbitbrush, Saskatoon serviceberry <br />and alkali sagebrush (Seriphidium arhusculum ssp. longilobum) accounted for the balance. <br />Native perennial cool season grasses averaged 37.1 percent of total vegetation cover. Fescue <br />(Festuca saximontana) was the main contributor and provided two-thirds of this lifeform's total. <br />Agassiz bluegrass accounted for one-fifth of the cover. Seven other species contributed <br />measurably to total vegetation cover, while five other species were present but did not.contribute <br />to total vegetation cover. Native perennial forbs averaged 21.5 percent of total vegetation cover. <br />One-flower woodsunflower (Helianthella uniflora) and weedy milkvetch (Astragalus miservar. <br />oblongifolius) contributed one-fifth of this lifeform's total. Together, Pacific aster (Virgulaster <br />ascendens), western yarrow, showy fleabane (Erigeron speciosus), and James starwart <br />(Pseudostellaria jamesiana) contributed nearly one-third of the total. Twelve other species made <br />measurable contributions. Native annual and biennial forbs and introduced perennial cool season <br />grasses each contributed 0.3 percent to total vegetation cover. <br />Total vegetation cover averaged 58.0 percent. Standing dead, litter, and bare soil values <br />averaged 4.8, 32.4, and 4.8 percent respectively. Species density was 23.2 species per 100 sq. <br />m. <br />Production (Table 21) <br />Total herbaceous production for all species averaged 710.2 pounds per acre. No alfalfa was <br />observed in this native reference area. <br />• Alkali Sagebrush Reference Area <br />(Photograph 27-30) <br />Cover (Table 22) <br />Native perennial forbs was the most abundant lifeform in the Alkali sagebrush reference area and <br />contributed 32.6 percent of total vegetation cover. Arrowleaf balsamroot (Balsamorhiza sagittata) <br />contributed nearly one-third of this lifeform's total. Gray lomatium (Lomatium grayi) and weedy <br />milkvetch each contributed one-fifth of the total. Prairie onion (Allium textile), two-groove <br />milkvetch (Astragalus bisulcatus), one-flower wood sunflower (Helianthella uniflora), showy <br />goldeneye (Heliomeris multiflora), longleaf phlox (Phlox longifolia), American vetch, and Pacific <br />aster (Virgulaster ascendens) were other native perennial forbs that contributed to total <br />vegetation cover. Native shrubs averaged 29.3 percent of total vegetation cover. Alkali <br />sagebrush (Seriphidium arbusculum ssp. longilobum) was the most abundant species in this area <br />and contributed more than eight-tenths of this lifeform's total. Mountain snowberry and big <br />sagabrush accounted for the balance. Introduced annual and biennial forbs contributed 5.5 <br />percent of total vegetation cover. Twolobe speedwell was the main contributor and accounted for <br />eight-tenths of this lifeform's total. Minor contributors include bull thistle and tower mustard <br />(Turritis glabra). Native annual and biennial forbs accounted for 2.8 percent of total vegetation <br />cover. Introduced perennial cool season grasses contributed 2.2 percent of total vegetation <br />cover. <br />Total vegetation cover averaged 36.0 percent. Standing dead, litter, and bare soil values <br />averaged 3.8, 33.0, and 27.2 percent respectively. Species density was 22.7 species per 100 sq. <br />m. <br />. Production (Table 23) <br />13 <br />