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n LJ -18- (or 16.58 of the total vegetation basal cover). Field bindweed accounted for 0.58 of the total pxoc?action and 0.82 of the total ground cover while minion bluemustard ca~rised U.42 of the total vegetative production. all three species are generally rharactrsistic of fields, wet areas and cultivated areas and are ooamonly enoo,.mter~ on abandoned agricultural sites (High, et al, 1959; Hitrl;eorJc arcl Chase, 1971; Harrington, 1954; porn, 1977). The distribution of the other species listed above as nmcious reeds is limited primarily to'roadsides, irrigation ditr~es and other disturbed sites within the study area. Besides the three atnve-mentiDred species. . cocoa was encountered in production and cover samples oollectexl in upland sagebrush and grassland vegetation types. SEiFNII7M II~DICAIOR PIaNlS Only ore primary selenium obligate or indicator plant (i.e., requires sel- enium for proper growth and will be foucrl only where there is selenium • in the soil) was encountered during vegetation investigattons at NuCla Mine: 1. S a iru~ata -desert princessplume Secondary selenium absorbers axe rot limited to soils oontaini*m selenium but may aoan2mlate selenium when gxowi.ng in seleniferous soils; however, all other a>nditions equal. they gxav just as well in soils containing m selenium. Secocriaxy selenium absorbers encountered during vegetation studies at Nucla Mine were: .~ 1. Grindelia squariosa - curlycup gumaeed 2. Gutierrizia sarothrae - bmun snakeweed The list of potential selenium indicator plants was obtained through re- view of relevant liternture (xicgstury, 1964) and use of the Plant Infor- ~tion Network (PIIJ) System, a mnputer-kaased in£orn~3tion retrieval sys- tan containing ecological inforniation on over 4,000 plant species from the Northern Roc]cy M'nmtain west. • (Revised March 2006) Attachment 2.05.6(2)-1-23