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SEI~ENILIDI II~DICATOR PLANTS <br />• A list of potential selenium indicator plants was obtained through re- <br />view of relevant literature (Kingsbury, 1964) and use of the Plant <br />Information Network (PIN) System, a outer-based information retrieval <br />system containing ecological information on over 4,000 plant species <br />fr~an the northern Rocky Mountain F7est. <br />No primary seleniinn obligate or indicator plant (i.e. , rte,; res seleni,~aa <br />for proper gr+awth and will be found only where there is selenium in the <br />soil) was encountered during vegetation investigations at Seneca II <br />mine revegetation plot. Secondary selenium absorbers are not limited to <br />soils containing seleni.im but may accwnulate selenium when growing in <br />seleniferous soils; however, all other conditions equal, they grow just <br />as well on soils containing no selenium. Only one secondary selenium <br />absorber was encountered during revegetation success studies at Seneca <br />II: <br />1. Grindelia squarrosa - curlycup guReaeed <br />Curlycup gtmweed was neither ccnnbn, widespread or concentrated locally <br />as to evidence seleniferous soils on the study area. It was not encoun- <br />tered in cover sales arxi accounted for only 0.1`4 of the total vegeta- <br />tion production on the plot. <br />TI~2EATEI~ AND ENDANGERID PLANT SPECIES <br />The Federal Register (June 17, 1979) lists 53 proposed threatene3 and <br />endangered plant species of Colorado. None of these plant species pro- <br />posed for threatened and endangered status were encountered in the re- <br />vegetation area. <br />A "vulnerable" plant species list for Colorado was obtained from the PIN <br />Systan. Plants listed as vulnerable are species that local taxonomists <br />think should be tmni.tored for possible decrease in range or number. <br />• None of the 33 "vulnerable" plant species of Colorado was encountered in <br />the study area. <br />-13- <br />