Plants loosely tuft-forming, sub­acaulescent or shortly caules­cent, 10–30 cm, pilosulous, hairs basifixed; from branched caudex. Stems prostrate, 0.4–9 cm, internodes less than 1 cm, pilosulous. Leaves 3–24 cm; stipules 2.5–8 mm, sub­membranous becoming papery; leaflets 17–27, blades rhombic- to elliptic-obovate or obovate-cuneate, 3–17(–27) mm, apex obtuse or emarginate, surfaces pilosulous. Peduncles humistrate or procumbent in fruit, 4–18 cm. Racemes loosely 7–14(–26)-flowered, flowers ascending; axis 2–5.5(–14) cm in fruit; bracts 1.5–8 mm; bracteoles 0(–2). Pedicels 0.6–3 mm. Flowers 17–20(–22) mm; calyx cylindric, 9.5–11(–12) mm, pilosulous, tube 8–9.5 mm, lobes subulate to triangular, 1–1.7 mm; corolla pink-purple; banner recurved through 45°; keel 17–19 mm. Legumes ascending (humistrate), green or purplish, straight proximally, incurved distally, obliquely oblong-ellipsoid or lanceoloid-ellipsoid, laterally compressed, abaxially compressed on drying, grooved only along dorsal suture, 21–30(–40) × 7.5–9(–16) mm, semibilocular, fleshy becoming subligneous, strigulose. Seeds 30–45.

Phenology: Flowering Apr–early Jul.
Habitat: Shadscale, matchweed, salt­bush, juniper, sagebrush, and grassland communities.
Elevation: 1300–1900 m.

Distribution

• Generated Map
• Legacy Map

Ariz., Nev.

Discussion

Astragalus eurylobus has a restricted distribution in Mohave County in Arizona, and Lincoln and Nye coun­ties in Nevada.

Astragalus eurylobus is very similar to A. tephrodes, with which it was originally associated as a variety, but from which it differs in its semibilocular (not unilocular or essentially so) thicker fruits with an inflexed septum 1–2 mm wide. Overall, it is a coarser plant than A. tephrodes.

Selected References

None.

Lower Taxa

None.