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• Shrub Density <br />Of the observed average of 222.6 shrubs per acre, mountain snowberry provided nearly half <br />(Table 8). Other species contributing were Saskatoon serviceberry, rubber rabbitbrush, <br />chokecherry, bitterbrush, and big sagebrush. <br />1991 Reclaimed Areas (Photographs 11 through 15) <br />Cover <br />Introduced annual and biennial forts, the most diverse lifeform in this reclamation unit, had the <br />highest percentage of total vegetation cover (65.8). More than half of this percentage was <br />provided by twolobe speedwell. Minor species contributing measurably to total vegetation cover <br />were burning-bush, bull thistle, prickly lettuce, yellow sweetctover, devil's shoestrings, <br />Russian thistle, Jim Hill mustard, pennycress, and salsify. Other species present were Iamb's <br />quarters, hounds tongue, pinnate tansymustard, early stickseed, tarweed, knotweed, and <br />mullein. Native annual and biennial forts contributed 2.1 percent of total vegetation cover. <br />Oakleaf goosefoot (Chen odium glaucuml, linearleaf collomia, Richardson's tansymustard <br />(Descurainia richardsoniil, dragonhead (Dracocenhalum parvifloruml, and denseflower <br />• pepperweed each provided one-fifth of this lifeform's total vegetation cover. Microsteris was <br />also present in less than measurable amounts. Introduced annual grasses accounted for 2.1 <br />percent of total vegetation cover. Cheatgrass provided more than half of this percentage. Wheat <br />contributed the balance of this lifeform's total measured vegetation cover. Japanese brome and <br />cereal rye (Secale cerealel were also present. <br />Native perennial cool season grasses contributed 19.4 percent of total vegetation cover. Agassiz <br /> <br />bluegrass provided nearly three-quarters of this percentage. Mountain brome, (oxtail barley, <br />and thickspike wheatgrass provided the remaining portion of this lifeform's total vegetation <br />cover. Introduced perennial cool season grasses accounted for 4.2 percent of total vegetation <br />cover. Smooth brome comprised tour-Btths of this percentage. The balance wes provided by <br />intermediate wheatgrass. Orchard grass was also present but did not contribute measurably to <br />total vegetation cover. <br />Native perennial forts provided an average of 4.6 percent of total vegetation cover. Gumwsed <br />accounted for nearly two-thirds of this percentage. Western yarrow, common yampa, and <br />James starwort provided the balance of this lifeform's total vegetation cover. Big-flowered <br />• <br />13 <br />