. Plant species of concern and plant associations of Powder River county, Montana . an elongated flowering stalk (Figure 5). A complete set of technical distinguishing characteristics hQ\}N^^w Astragalus barrii and Astragalus ftyalinus is summarized in Heidel and MaiTiott(1996). Habitats: Barr's Milkvetch is restricted to sparsely vegetated knolls, buttes, and barren hilltops, on calcareous soft shale and siltstone. It is often found at tlie rim of outcrops and midslope benches (Figure 6). These microhabitat settings represent thin silty ecological sites. Their clay fraction is high enough in
. Plant species of concern and plant associations of Powder River county, Montana . an elongated flowering stalk (Figure 5). A complete set of technical distinguishing characteristics hQ\}N^^w Astragalus barrii and Astragalus ftyalinus is summarized in Heidel and MaiTiott(1996). Habitats: Barr's Milkvetch is restricted to sparsely vegetated knolls, buttes, and barren hilltops, on calcareous soft shale and siltstone. It is often found at tlie rim of outcrops and midslope benches (Figure 6). These microhabitat settings represent thin silty ecological sites. Their clay fraction is high enough in places to classify tlie microhabitats as thin clayey. There is little or no soil profile development but there are generally no restrictive layers that would classify the microhabitats as a shallow ecological site. These microhabitats occur within predominantly silty ecological sites, but while tliey occupy a small fraction of the landscape, they are widespread and recurrent in part of BLM-administered lands (Figures 7 and 8).
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Keywords: ., bhl, bookcollectionamericana, bookleafnumber54, booksubjectbotany
