Astragalus subcinereus A. Gray, Proc. Amer. Acad. 13: 366. 1878. [Phaca subcinerea (A. Gray) Rydberg, Bull. Torrey Bot. Club 40: 47. 1913; Type: Arizona, Mohave Co., “Mokiak Pass, E. Palmer 117, in1877,” holotype GH!, isotypes CAS!, GH!, Mo, NY!, US!, some of the isotypes are labeled "s.w. Utah"]

Silvery milkvetch

Perennial, caulescent, 14–90 cm long, radiating from a subterranean, branching caudex; pubescence basifixed; stems buried for 2–15 cm, prostrate to weakly ascending; stipules 1.5-6.5 mm long, at least some connate-sheathing; leaves 1.5–8.5 cm long; leaflets 9–23, 2–16 mm long, 1–8.5 (10) mm wide, oblong to oblanceolate or obovate, obtuse, emarginate, or retuse, villosulous on both surfaces or glabrate above; peduncles 1.5–10 cm long; racemes 5–37-flowered, the flowers ascending to declined at anthesis, the axis 1–7 cm long in fruit; bracts 1–3 mm long; pedicels 0.5–2.5 mm long; bracteoles 0–1; calyx 3.4–6.3 mm long, the tube 2.3–3.6 mm long, campanulate, villosulous, the teeth 0.9–2.9 mm long, subulate; flowers 6–11 mm long, ochroleucous and commonly suffused with purple; pods spreading to declined, subsessile, inflated, ovoid-ellipsoid to ellipsoid, 12–27 mm long, (3.5) 6–13 mm wide (when
pressed), subterete to dorsiventrally compressed, thinly villosulous, mottled; ovules 10–20.