. Plant species of concern and plant associations of Powder River county, Montana . Photo by Boimie Heidel Location Near tlie eastern edge of the county, along Cabin Creek, about 13 miles N of Boyes, MT, primarily NW of Moore Road. General Description Tliis area is characterized by gently rolling upland plains and widely scattered drainages. Dominant vegetation is a diversity of grasslaud types, all with Hespevostipa comata (needle-and-thread). Large areas of Wyoming big sage- bmsh grassland are interjected oumidslopes. The upper segments of well-diained sandy slopes along watercourses and ri
. Plant species of concern and plant associations of Powder River county, Montana . Photo by Boimie Heidel Location Near tlie eastern edge of the county, along Cabin Creek, about 13 miles N of Boyes, MT, primarily NW of Moore Road. General Description Tliis area is characterized by gently rolling upland plains and widely scattered drainages. Dominant vegetation is a diversity of grasslaud types, all with Hespevostipa comata (needle-and-thread). Large areas of Wyoming big sage- bmsh grassland are interjected oumidslopes. The upper segments of well-diained sandy slopes along watercourses and ridges are co-dominated by Calamomlfa longifolia (prairie sandreed). Vegetation Communities This area supports two significant vegetation types. The grassland is a Calaiuoxilfa longifolia - Hesperostipa comata (prairie sandreed - needle-and-diread) commimity, botli species witli about 20% cover. CarexfiUfolia (tliread-leaved sedge) and C inops (sun sedge) are each present witli about 10% cover, and tliere is a diversity of forbs (27 species recorded), witli only Ambrosiapsilostacfn/a (naked- spike ambrosia) abundant. The shmb-herbaceous community on Ihemidslopes is doimn?itQd by Arte tries ia tridetitata ssp. }]yomii}gefisis (Wyoming bigsage), witli cover over 10%. The understoiy is co-dominated by Pascopyrum smithii (western wheatgrass) at 30% cover and Buchloe dactyloides (buffalo grass) at 40% cover. Environmental Characteristics A range of sedimentaiy bedrock materials not apparent from the topography underlies tlie uplands and drainages. Soils are Remmit-Ocean Lake, with 8-25% slopes and Arvada-Bone complex widi 0-4% slopes. Appendix B-11
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