1. Ovary and fruit ± densely pubescent with long hairs; escapes from cultivation in disturbed places.
1. Ovary and fruit glabrous or nearly so; native species.
2. Pubescence of stem and leaves including many 2-pronged hairs; stipules (at least the lower) connate with a belt of tissue around the stem; fruit 4.5–6.5 mm thick, 2-locular; plants rhizomatous.
2. Pubescence of stem and leaves all of simple hairs; stipules not connate; fruit 10–15 mm thick, 1-locular; plant from a taproot.
All species found in Astragalus
MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. February 23, 2018. http://www.michiganflora.net/genus.aspx?id=Astragalus.