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-18- • (or 16.58 of the total vegetation basal rover). Field bindweed accounted for 0.58 of the total production and 0.88 of the total ground mver while wmron bluemustard wrrgrised 0.4~ of the total vegetative production. All three species are generally characteristic of fields, wet areas and cultivated areas and are wimonly encountered on abandoned agricultural sites (Hitchwc,k, et al, 1959; Hitchcock and Chase, 1971; Harrington, 1954; Ibrn, 1977). The distribution of the other species listed above as noxious weeds is limited primarily to roadsides, irrigation ditches and other disturbed sites within the study area. Besides the three above-mentioned species, none was enwuntered in production and weer sarr~les collected in upland sagebrush and grassland vegetation types. SII.FS7IUM IIdDICA~UR PZANfS Only one prinary selenium obligate or indicator plant (i.e., requires sel- enium for proper growth and will be found only where there is selenium • in the soil) was encountered during vegetation investigations at Nucla Mine: 1. Stanleya pinnata -desert princessplume Secondary selenium absorbers are not limited to soils wntaining selenium but may acc:mnilate selenium when growing in seleniferous soils; however, all other wnditions equal, they grow just as well in soils containing no selenium. Sewndary selenium absorbers encountered during vegetation studies at Nucla Mine were: 1. Grindelia squarrosa - curlycup gumweed 2. Gutierrizia sarothrae -broom snakeweed The list of potential selenium indicator plants was obtained through re- view of relevant literature (Kingsbury, 1964) and use of the Plant Infor- mstion Network (PIN) System, a commuter-based information retrieval sys- • tem wnra;n;.,g ewlogical information on over 4,000 plant species from the Northern Rocky NY~iu~tain west.