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VEC~TATION SPFICIES 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 (orbs, 30 grass, 11 shrub, 2 tree, and 3 grass-like species. Six of these species are listed as noxious weeds. One species is a primary 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 type/aspen subtype and upland sagebrush vegetation on the study area flower in early-late spring, produce mature seeds by mid-late sumrer and are largely vegetative in the fall. Flowering occurs sooner on the more exposed slopes at lower elevations and is sustained over a longer period in mist conditions. Herbaceous species characteristic of the aspen subtype ezrerge from perennial crowns under the litter layer in early spring, g~ to their fullest extent by July and then die back to croFms in the fall. Of the ooaann shrubs, serviceberrv 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 moisture. NOXiOLlS WEEDS The most recent listing of noxious weeds (State Noxious Weed Seed Requirements Recrognized 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 weds wire encount~sed: 1. Agropyron repens - quackgrass 2. Avena fatua - wild oat ~• 3. Cirsium arvense - Canada thistle -25-