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and mule's ear (Wyethia amplexicaulisl. Introduced perennial forbs provided 11.2 percent of <br />total vegetation cover. Nearly all of this percentage was contributed by alfalfa. Cicer milkvetch <br />and Canada thistle were the only other species providing measurable cover. Whitetop (Cardaria <br />~~ and common dandelion were also present. <br />Introduced annual and biennial forbs accounted for 11.6 percent of total vegetation cover. <br />Twolobe speedwell provided nearly all of this percentage. Prickly lettuce, tarweed, yellow <br />sweeetclover, devil's shoestrings (Po~yyonum arenastruml, Russian thistle Isola <br />australisl, Jim Hill mustard, pennycress, and salsify contributed the balance of this lifeform's <br />measured total vegetation cover. Other species present included burning-bush (Bassia <br />sieversianal, littlepod falseflax, Iamb's quarters (Chenopodium album), bull thistle, hound's <br />tongue, knotweed, tower mustard iTuritis glabral, and mullein (Verbascum thap~usl. Native <br />annual and biennial forbs accounted for 1.4 percent of total vegetation cover. Most of this was <br />provided by linearleaf collomia. The other species contributing measurably to total vegetation <br />cover was microsteris. Minor species present were Fremont goosefoot (Chenopodium <br />fremontiil, baby blue-eyes, and denseflower pepperweed (Leoidium densifloruml. Introduced <br />annual grasses provided 5.2 percent of total vegetation cover. Cheatgrass provided three- <br />• quarters of this percentage. The other quarter was provided by Japanese brome. Wheat <br />(Triticum aestivuml was also present. One native shrub, big sagebrush, accounted for 0.3 <br />percent of total vegetation cover. Other species present were; Saskatoon serviceberry, rubber <br />rabbitbrush, chokecherry, bitterbrush (Purshia tridentatal, and mountain snowberry. <br />Total vegetation cover averaged 63.5 percent. Standing dead, litter, bare soil, and rock cover <br />averaged 0.4, 28.3, 6.8, and 1.0 percent, respectively. Species density averaged 31.5 species <br />per 100 sq. m. <br />Alfalfa, an introduced perennial fort, produced an average of 535.3 oven-dry pounds of biomass <br />per acre (Table 6). Together, all other species averaged 2,071.7 pounds of production per acre <br />and total production averaged 2,607 pounds of biomass per acre. <br />• <br />12 <br />