. Plant species of concern and plant associations of Powder River county, Montana . Plant communities; Endangered plants; Rare plants; Botany; Plant conservation. STUDY AREA Figure 1. Topography of Powder River County Location Powder River County covers 3,297 square miles of unglaciated Missouri Plateau in die Eastern Sedimentary Plains of southeast Mon- tana. The Powder River aud its tributaries, including Little Powder River, Mizpah Creek and Pumpkin Creek, drain most of tlie county, dissecting the uplands and underlying sedi- mentaiy bedrock layeis. Ottei' Creek and Bea- ^>'^ ver Creek,
. Plant species of concern and plant associations of Powder River county, Montana . Plant communities; Endangered plants; Rare plants; Botany; Plant conservation. STUDY AREA Figure 1. Topography of Powder River County Location Powder River County covers 3,297 square miles of unglaciated Missouri Plateau in die Eastern Sedimentary Plains of southeast Mon- tana. The Powder River aud its tributaries, including Little Powder River, Mizpah Creek and Pumpkin Creek, drain most of tlie county, dissecting the uplands and underlying sedi- mentaiy bedrock layeis. Ottei' Creek and Bea- ^>'^ ver Creek, tributaries of the Tongue River, drain the west end of the county. Nortli-soutli valleys and intei'vening ridges fonn the preva- lent landfomis (Figure 1), spanning elevations from 2,768 feet in tlie county's northwest cor- nel' to 4,305 feet in die soutliwest comer (Parker etal. 1971).. Powder River County was part of Custer County until 1919. The county seat, Broadus, lies at tlie junc- tion of tlie county's two main highways, M-59 and US-212. Lands in tlie county weie settled for ranch- ing, and beef production reached its peak between 1880 - 1920 when open range prevailed (Parker et ak 1971). Cattle ranching remains tlie first and foremost industry the county today. Like other counties in tliis area, the prevailing land cover is rangeland, however it includes a relatively high woodland component. In 1976, land cover in Powder River County was 84% rangeland, 10% woodland, and 5% cropland (Ross and Hunter 1976). The highest ridge systems and the most extensive pine woodlands lie witliin the Ashland District of Cus- ter National Forest at the western end of tlie County, diough tliere are pine-covered escarpments and knolls in the soutlieastem comer and widely scattered tliroughout the County. Lands administei ed by the BLM are concentrated on, but not limited to, rough teirain along the Powder and Little Powder Riv- ers (Figure 2), and are intenningled witli private and state
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