. Plant species of concern and plant associations of Powder River county, Montana . Photo by Boiuiie Heidel Location North of Horse Creek, approximately 7 miles N of Biddle, MT, miles E on Belle Creek Rd and miles N, following a seiies of turns going primarily N for about miles to tlie only public access for the site from tJie soutli. General Description The Little Powder Hills are a series of ridges and valleys along side tiibutaries of tlie Little Powder River. Horse Creek has tlie broadest valley of tliose tributaries, with prairie dog towns and some tame- grass hayland. Abrupt
. Plant species of concern and plant associations of Powder River county, Montana . Photo by Boiuiie Heidel Location North of Horse Creek, approximately 7 miles N of Biddle, MT, miles E on Belle Creek Rd and miles N, following a seiies of turns going primarily N for about miles to tlie only public access for the site from tJie soutli. General Description The Little Powder Hills are a series of ridges and valleys along side tiibutaries of tlie Little Powder River. Horse Creek has tlie broadest valley of tliose tributaries, with prairie dog towns and some tame- grass hayland. Abrupt, scattered ridgecrests and valley rims have siltstone outcrops, and support the most extensive upland successional communities. Giasslands predominate, grading into sagebmsh steppe on steep, upper slopes and in tlie intact valleybottoms. Vegetation Communities A productive Artemisia trideniata ssp. wyomingejisis (Wyoming bigsage) steppe community, witli sage- bmsh cover exceeding 30%, dominates tlie higlier slopes and topographic positions. The understoiy is co-dominated by Pascopyrum smithii (western wheatgrass) at over 30%, Koeteria mewrantha (prairie junegrass) at less than 30 %, and Carex fiUfoUa (tliread-leaved sedge) at less tlian 20%. Co-dominance by tliread-leaved sedge represents tlie cool phase of tliis association in Powder River County. Environmental Characteristics Side tributaries of tlie Little Powder River dissect the uplands. Grasslands prevail, with scattered ridge outcrops and steppe on their uppei' north-facing slopes. The shrub communities grade into grassland with decreasing slope and lower topogiaphic position, and into sparsely vegetated communities on ex- posed aspects. Soils are Midway - Elso, with 8-35?'o slope. The Elso and Midway soil series predomi- nate, originating from a siltstone of remarkable unifonnity. Widely scattered areas of sandstone out- crops occur at lower elevations. Appendix B-6
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