. Plant species of concern and plant associations of Powder River county, Montana . Plant communities; Endangered plants; Rare plants; Botany; Plant conservation. Figurt 7. Landscape of Astragalus barrii habitat {Mnsifieon diraricatum), broom snakeweed (Gutierrezia saroihrae), few-flowered buckwheat (Eriogounmpaucijlorum), textile onion (Allium textile), cushion goldenweed (Haplopappus acauUs, x goldenweed (Haplopappus armerioides), and {Hyinenoxys richardsomi). There are species tliat have been characterized as pait of associated vegetation in past reports and as part of the information recor
. Plant species of concern and plant associations of Powder River county, Montana . Plant communities; Endangered plants; Rare plants; Botany; Plant conservation. Figurt 7. Landscape of Astragalus barrii habitat {Mnsifieon diraricatum), broom snakeweed (Gutierrezia saroihrae), few-flowered buckwheat (Eriogounmpaucijlorum), textile onion (Allium textile), cushion goldenweed (Haplopappus acauUs, x goldenweed (Haplopappus armerioides), and {Hyinenoxys richardsomi). There are species tliat have been characterized as pait of associated vegetation in past reports and as part of the information recorded for individual records, however, they are actually found on adjoining sandstone substrates ratlier tlian soft shale with Astragalus barrii. Plants such as little bluestem (Andropogon scoparius) and soapweed (Yucca glauca) do not generally occupy tlie same microhabitats as Astragalus barrii while tliey may be common and conspicuous all around it. Comments: The species almost always occurs in habitats considered secondaiy range, in addition, the plant is not grazed due to its low gi'owth foim. It is little-affected by allotment management practices and developments unless concentrated livestock trampling occurs in its habitat. Astragalus barrii is potentially vulnerable to exotic species encroachment It is an early- succession species and its forested habitat settings may be subject to increased tree canopy cover. Any revegetation efforts should avoid seeding sweetc lover (Melilotus spp.) in proximity. There is little encroachment by weedy annuals at present. The fine texture and instability of the soils limit invasion by annual bromes. A non-native mustard, malcolmia (Malacolmia africana), is in early stages of invading fme-textured slopes of Powder River County and elsewhere. It appears to be spreading along Figure 8. Habitat of Astraga- lus barrii above Horse Creek Appendix C-3. Please note that these images are extracted from scanned page images that may have
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