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$oecies Composition -Baseline Area <br />The shrub growth form dominated this vegetation type. Mountain sagebrush (Seriphidium <br />vas@yanum), and mountain snowberry were the dominant shrubs. Shrub cover measured 40.0 <br />percent. Native perennial grasses provided 35.0 percent and native perennial (orbs contributed <br />22.6 percent. These last two growth forms, especially the native perennial forts, contributed the <br />majority of the diversity found in this vegetation type. Introduced perennial forts and grasses were <br />more common here than in the previous two vegetation types but still comprised only a small part <br />of total cover. Even when the cover contributions from each were combined, the total for any of•the <br />sample cover estimates was less than 2 percent. Native annual and biennial (orbs also contributed <br />less than 2 percent to any of the cover estimates, but were commonly present (at least 60 percent, <br />frequency). <br />The codominant shrubs were mountain sagebrush with 15.1 percent cover and 100 percent <br />frequency, and mountain snowberry with 18.6 percent cover and 93.3 percent frequency. The <br />combined native perennial grasses and forts contributed 57.6 percent cover. Agassiz bluegrass <br /> <br />dominated all other species with 20.6 percent cover. Other native grass species with cover between <br />1 and 3.5 percent include Letterman needlegrass (S.tipa lettermaniil, western wheatgrass <br />(Pascopyrum smithiil, slender wheatgrass, Montana wheatgrass (j=jymus lanceolatus), and <br />mountain brome (Ceratochloa carinatal. The native perennial forts that contributed between 1 and <br />4 percent cover were western yarrow (Achilles lanulosal, showy fleabane (Eriperon speciosusl, <br />weedy milkvetch (Astragalus miser), fringed thistle (Cirsium centaureael, nettle-leaf giant <br />hyssop, tailcup lupine (~ttpinus caudatus), wild tarragon (Oliaosoorus dracunculus ssp. glaucusl, <br />and one-flower woodsunflower fHelianthella uniflora). The most common introduced species was <br />hound's tongue with 0.4 percent cover and 40.0 percent frequency. <br />In the Supplemental Area of the Sagebrush vegetation type, cover was dominated by native perennial <br />graminoids with 42.4 percent cover, compared to 35.0 percent in the Baseline Area sampling of <br />1990. The major species contributing to this cover in the Supplemental Area were Agassiz <br />bluegrass, sheep fescue (Festuca brachvohvlla ssp. coloradensis), and western wheatgrass. The <br />next most abundant lifeform was native shrubs which had 30.9 percent cover, compared to 40.0 <br />percent cover in the 1990 Baseline Area sampling. The largest contributors to this amount were <br />big sagebrush (Seriphidium tridentatuml, mountain snowberry, and mountain sagebrush, in that <br />order. Native perennial forts comprised 22.7 percent cover, compared to a figure of 22.6 percent • <br />observed in the 1990 Baseline Area sampling. The major species contributing to the supplemental <br />10 <br />