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4-116 <br />• Twenty plant species--22 percent of the total identified--are <br />introduced from outside of the region. This percentage is made <br />up of the weedy forbs, two grasses, and one weedy shrub. Two <br />species, field bindweed ConvoQvu2u6 anvene~~ and whitetop <br />caadantia d2aba, are listed by Thornton et al. (1974) as being <br />prohibited noxious weeds (especially difficult to control). <br />Field pennycress Th~aepti ahvenee is cited by Thornton as being <br />a restricted noxious weed (very objectionable but can be controlled). <br />There are no federally listed threatened or endangered plant <br />species present on the study site. <br />4.8.12 Reference Areas <br />• 4.8.12.1 Greasewood Shrubland Reference Area <br />The Greasewood Shrubland reference area is located in Section 21, <br />T75, R102W along Colorado Highway 139 approximately 1 mile north <br />of the Munger Canyon permit area. The reference area is tri- <br />angular in shape and incorporates approximately 7 crate See <br />Figure 4.8-2. <br />The reference Greasewood Shrubland is representative of the area <br />with respect to cover, but much higher in production. Total cover <br />in.the affected area is 65.3 contrasted to 67.7 in the reference. <br />Production for the affected area is 647 pounds per acre contrasted <br />to 1,216 for the reference. Greasewood is the dominant shrub as <br />in the affected area although big sagebrush is also prevalent in <br />the affected area. The reference area is apparently not as dis- <br />turbed and overgrazed as the affected area as suggested by the <br />