Hedysarum boreale Nutt., a native legume widely distributed in the Intermountain Western United States, hosts a rich diversity of bee pollinators. This diversity includes several megachilids, in particular Osmia and Hoplitis, who appear to be broad generalists shared with other papilionaceous legumes. The foraging behaviors of several bee species are described. Ultimately, these observations will help to identify a manageable cavity-nesting bee species for row crop production of H. boreale seed to be used for conservation purposes. H. boreale seed is currently sought for rehabilitation of degraded rangeland in the Intermountain West.