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The list of potential selenium indicator plants was obtained through review <br />of relevant literature (Kingsbury, 1964) and use of the Plant Information <br />Network (PIN) System (Colorado State University, Fort Collins, Colorado), <br />a ca~uter-based inforniation retrieval system containing ecological <br />informatien on over 4,000 plant species from the northern Rocky Nbuntain <br />West. <br />The primary selenium indicator plant encountered on the study area is <br />neither eacamn, widespread nor concentrate3 Locally as to e-.ridence <br />seleni.ferous 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 2.78 and 1.08 of the total vegetative basal cover in upland sage- <br />brush vegetation in affected and control areas, respectively (Appendix B). <br />It was not encountered in mixed brush type/aspen subtype cover sales, <br />but accuw~ted for 0.148 of the total vegetation production in this <br />vegetation type saled in affected areas. This species also acwunted <br />for 0.4 and 5.68 of the total vegetation production in upland sagebrush <br />affected and ~ntrol areas, respectively. Nowhere, 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 guaweed 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 iroving objects. <br />TfIREATINID AND ENDANGERED PLANT SP C7ES <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 enwuntered in the <br />l . study area. <br />-27- <br />