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introduced perennial forbs, and 230.2 were introduced perennial cool season grasses. Four other lifeforms <br />were present, each comprising less than 100 pounds per acre. <br />WOODY PLANT DENSITY <br />"Background" Density <br />(Table A -3) <br />Total average "Background" woody plant density in the BRB -1 in 2011 was 246.9 stems per acre. Big <br />sagebrush (Seriphidium tridentatum) was the densest at 129.5 stems per acre followed by mountain <br />snowberry (Symphoricarpos rotundifolius) with 70.0 stems per acre. Six other species of shrub were <br />present, each with densities of fewer than 30 stems per acre. <br />Concentration Area Density <br />(Table A- 4) <br />Total average "Concentration Area" woody plant density in the BRB -1 in 2011 was 4,208.8 stems per acre. <br />Big sagebrush was the densest at 2,367.4 live stems per acre (not including 33.2 dead stems per acre) <br />followed by mountain snowberry with 1,221.4 stems per acre, Woods rose (Rosa woodsii) with 382.0 stems <br />per acre and Saskatoon serviceberry (Amelanchier alnifolia) with 111.7 stems per acre. Six other species of <br />shrub were present, each with densities of fewer than 30 stems per acre. <br />2011 Aspen Reference Area <br />(Photographs 31 through 45) <br />COVER <br />(Table A -5) <br />Native perennial forbs were the predominant lifeform observed in the Aspen Reference Area, contributing <br />76.3 percent all -hit vegetation cover. Native shrubs and trees also contributed heavily with 34.3 and 20.1 <br />percent all -hit vegetation cover respectively - Saskatoon serviceberry contributed 9.7 percent, mountain <br />snowberry contributed 20.7 percent and aspen (Populus tremuloides) contributed 20.1 percent all -hit <br />vegetation cover. Native perennial cool season grasses also made a moderate contribution to cover with <br />12.9 percent. A total of 89 native species were encountered in quantitative sampling. Also observed in the <br />area were the noxious weeds hound's tongue (1.4 percent cover), bull thistle (Cirsium vulgare) (trace), and <br />Canada thistle (0.6 percent cover). <br />14 <br />