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VEGETATION SPECIES ~~4POSITION A listing by life form of all vegetative species encountered on or near the study area is presented in Appendix C. A total of 172 species has ~ been encountered; 126 forbs, 30 grass, 11 shrub, 2 tree, and 3 grass-like species. Six of these species are listed as noxious weeds. One species is a prirary selenium indicator and four species are secondary absorbers of selenium. No plants proposed or listed as threatened or endangered were encountered on the study area (Federal Register, July 1, 1975 and January 17, 1979) . The majority of the herbaceous species in mixed brush typelaspen subtype and upland sagebrush vegetation on the study area flower in early-late spring, produce mature seeds by mid-late sutures and are largely vegetative in the fall. Flowering occurs sooner on the tmre exposed slopes at lower elevations and is sustained over a longer period in mmist wnditions. Herbaceous species characteristic of the aspen subtype eiresge £rom perennial crams under the litter layer in early spring, grow to their fullest extent by July and then die back to crowns in the fall. Of the oommn shrubs, serviceberry and chokecherry bloom in the spring and produce ripening fruits by July. Snowberry exhibits a similar phenology although in many of the aspen stands it was still blooming in July indicating a longer availability of imisture. NOXIOUS WEEDS The most recent listing of noxious weeds (State Noxious Weed Seed Regiurements Recognized in the Administration of the Federal Seed Act, USDA, January, 1978) was consulted to determine whether any of the species listed therein occurred on the study area. The following noxious weeds were encountered: 1. Agropyron repens - quackgrass 2. Avena fatua -wild oat ~. 3. Cirsium arvense - Canada thistle -25-