Torrey, J. (March 1827), Some account of a collection of plants made during a journey to and from the Rocky Mountains in the summer of 1820, by Edwin P. James, M.D. Assistant Surgeon U.S. Army. Annals of the Lyceum of Natural History of New York 2(6): 178 [tax. nov.]

• Type: "On the Platte."

Hartley, W. (1953), Standardized Plant Names: a revised list of standard common names for the more important Australian grasses, other pasture plants, and weeds. Bulletin (CSIRO) 272: 15 [secondary reference]

Barneby, R.C. (1964), Atlas of North American Astragalus. Memoirs of the New York Botanical Garden 13: 1-1188 (733-747) [secondary reference]

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