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No plants observed are included in state or federal lists of threatened <br /> or enaangered species. Weber and Johnston (1979) list the Northern Bog Orchid <br /> La m✓ onc.00 Aype2vv-tea as "endangeres." However, they have applied this status <br /> to all orchids, and their listing is not official . <br /> 3.3 Description of Reference Areas <br /> The plant ecology of each reference area is described in the following <br /> subsections. <br /> 3.3.1 Aspen Woodland <br /> The Aspen Woodland reference area was established at 9,200 ft on <br /> a south—facing area with an average slope of about 30 percent . This reference <br /> area contained twenty—five species in three distinct layers; total cover was <br /> 91 percent . <br /> The tree overstory consisted almost entirely of Quaking Aspen, <br /> wnich averaged 9 m tall , provided 75 percent cover, was present in !CC <br /> percent of the samples, and had a total density of 2,331 trees per hectare. <br /> Shrubs added less than 2 percent cover , with Mountain Snowberry dominant. Shrubs <br /> averagea 52 cm tali and 6,997 individuals per hectare. The herbaceous under— <br /> story was dominated by Elk Sedge (4.7 percent cover, 53 percent frequency) , <br /> and Blue WK arye (2.7 percent cover , d0 percent frequency) ; prominent (orbs <br /> included `Nhitefiower Peavine, Porter Lovage, and Bracken Fern. Total herbaceous <br /> cover was 12 percent . <br /> Total production in this reference area was 65.0 g/^2, with fortis <br /> providing 59 percent . The most productive individual species were Elk Sedge <br /> (1S.2 g/m2) , Bracken Fern (13.1 g/m2) , Blue 'Wildrye (7.3 g/m2) , and 'Whiteflower <br /> ?eavine (7.1 g/m2) . <br /> Cover, production, and woody plant data for the Aspen Woodland <br /> reference area are presented in Tables 11, 12, and 13. The exact location is <br /> shown in Figure 2. <br /> 3.3.2 Aspen Shrubland <br /> The reference area for this sampling unit was located on a AC <br /> percent , south—facing siege at an elevation o; about 8 ,60C ft (Figure 2 ) . <br /> Total cover of 93 percent was distributea among seventeen species. <br /> The reference area had a tree layer ocminated by ooth quaking <br /> ,aspen ( 17 percent cover, 53 percent frequency ) and Cambel Cak ( 38 percent <br /> cover , SC percent frequency ) . Shrubs prcvicea an aeeiticnai 17 percent <br /> cover ; prevalent species were Servicenerry and Chekecner-y. Average heignt <br /> was 10= cm, ant average density was 30 ,329 shrubs per nectare. I7por:an7 <br /> herbaceous species includec Elk Secge ( 14 percent cover , 7j percent `requenc` l , <br /> Blue ",'ilcrye, Tnurber wescue, and Native Sluegrass. 7cral herbaceous cover <br /> Nas 20 percent . <br /> —16— <br />