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The list of potential selenium indicator plants was obtained through reviev <br />of relevant literature (Kingsbury, 1964) and use of the Plant Information <br />Network (PIN) System (Colorado State University, Fort Collins, Colorado), <br />a carputer-based information retrie~ral system containing ecological <br />information on over 4,000 plant species from the northern Rocky Mountain <br />west. <br />The primary selenium indicator plant encountered on the study area is <br />neither eca~rtnn, widespread nor concentrated locally as to e-~idence <br />seleniferous soils. It was not found in the 242 production and cover <br />quadrats sampled. <br />Of the secondary selenium absorbers, only one, Aster chilensis (Pacific <br />aster) was encountered in production and cover samples. It accounted <br />for 2.7$ and 1.Og of the total vegetative basal cover in upland sage- <br />brush vegetation in affected and control areas, respectively (Appendix B). <br />It was not enrountered in mixed brush type/aspen subtype cover samples, <br />but ac~unted for 0.14 of the total vegetation production in this <br />vegetation type saag~led in affected areas. This species also accounted <br />for 0.4 and 5.6~ of the total vegetation production in upland sagebrush <br />affected and control areas, respectively. Navhere, however, was the <br />plant observed in large concentrations. This and the absence of other <br />selenium indicators preclude likelihood of seleniferous soils within <br />the area of investigation. <br />Curlycup gu~eed was occasionally found on roadways in the study area. <br />This species is very glandular (sticky) and produces high quantities <br />of seeds. Seed dispersal along roadways may be aided by the plant's <br />potential to attach to moving objects. <br />TFIRFATENID AND ENDANGERED PLAN'P SPECIES <br />The Federal Register (June 17, 1979) lists 53 proposed threatened and <br />endangered plant species of Colorado. None of these plant species <br />proposed for threatened and endangered status were encountered in the <br />C • study area. <br />-27- <br />