. Plant species of concern and plant associations of Powder River county, Montana . Figure 1. Illustration oiAstragalus barrii (Figure 3). The petals are 7 to 17 mm long. The calyx is 3 to 5 mm long and densely covered with long, white hairs. The sparsely white, haiiy pod is nanowly elliptical, 4-8 mm long, and 1 to 2 mm in diameter. Flowering occurs in May-early June and fmiting from late May-June. The only other mat-fomiing species with 3-leaflets in the range of Astragalus barrii in Montana are

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