. Plant species of concern and plant associations of Powder River county, Montana . 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 com
. Plant species of concern and plant associations of Powder River county, Montana . 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 lands. Climate The area's climate is continental and typical of tlie high plains, witli cold winters, warm summers, and peak rainfall early in tlie growing season. Average annual precipitation at Broadus is inches while across tlie county averages range from 11-19 inches. The average of meanmondily temperatures is ° Celsius (; Fahrenlieit), with summei' temperatures usually cooler tlian in tlie Yellowstone River val- ley to the north (Parkei' et al. 1971). Precipitation is typically concentjated in May and June, and maxi- mum mean monthly temperatures occur later in July, resulting in a late summer water deficit (Figure 3). Compiled climate data invariably mask tlie high degree of variation in climate from year-to-year, moiitli- to-month, and tlie great variations tliat occur
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