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-19- <br />• Desert princessplume, the primary selenium indicator plant encountered on <br />the study area is neither oocmm~, widespread nor concentrated locally as <br />to evidence seleniferous soils. It was not found in the 244 production <br />and Dover quadrats sailed. The species generally occurs on dry soils <br />on hills and banks (Harrington, 1954). <br />Brown snakeweed was encountered in production sales collected in up- <br />land sagebrush at affected and control sites and in grassland at the con- <br />trol site. It was also represented in grassland-control Dover quadrats. <br />In the grassland crontrol site, the species accounted for 9.78 (66.4 lbs/ <br />acre) of the total vegetation production and 1.18 of the total ground <br />cover (7.98 of the total vegetation basal cover) (Appendix B). The spe- <br />cies accounted for 3.28 (28.9 lbs/acre) and 0.28 (2.0 lbs/acre) of the <br />total vegetation production in upland sagebrush affected and control sites, <br />respectively. <br />Curlycup gumweed was encountered only in Dover samples collected in the <br />grassland affected areas. At this site it contributed 0.68 of the total <br />ground Dover or 6.28 of the total vegetation basal Dover. The species <br />was also frequently observed on roadsides and other disturbed areas <br />on the study site. <br />The lack of any larc3e concentrations of these two species together with <br />any prinary selenium indicators probably precludes the presence of sel- <br />eniferous soils on the study area. However, soil samples from upland <br />sagebrush and grassland vegetation types, where the above species were ob- <br />served, were collected and submitted to Front Range Labs, Inc., Ft. Collins, <br />Colorado for selenium analyses. Procedures e~loyed in the soil sample <br />collection and analysis and the results of the analysis are presented in <br />Appendix D. Selenium oonoentrations ranged fran 0.006-0.050 ppm with an <br />average of 0.022 ppm for all samples. Based on information provided by <br />Chagnan (1966) and Underwood (1971), these concentrations are well within <br />the normal range for soils and are not indicative of seleniferous soils. <br />• THREATINED AND ENDANGERID PL?tNT SPECIES <br />The Federal Register (June ].F, 1976) lists 53 proposal threatened and <br /> <br />