Astragalus drabelliformis
Mem. New York Bot. Gard. 13: 287. 1964.
Plants tuft- or mat-forming, 1–3 cm, densely strigose-strigulose; from branched caudex. Stems obscured by marcescent leaf bases and stipules. Leaves mostly reduced to phyllodia, 1–2.5 cm; stipules connate-sheathing throughout, 1.5–5 mm, membranous; phyllodia oblanceolate or spatulate proximally, linear-oblanceolate distally, 10–25 mm, apex acute or subacute, surfaces strigose. Peduncles ascending, prostrate in fruit, 1–2.5 cm. Racemes densely 1–4-flowered; axis 0–0.5 cm in fruit; bracts 0.6–1 mm; bracteoles 0. Pedicels 0.6–1 mm. Flowers 5.2–7 mm; calyx turbinate-campanulate, 2.5–3.3 mm, strigose, tube 1.7–2.1 mm, lobes subulate, 0.8–1.2 mm; corolla pink purplish; banner recurved through 50–70°; keel 3.7–4.3 mm. Legumes ascending, green, often red-mottled, becoming stramineous, straight or slightly curved, narrowly and obliquely lanceoloid to lanceoloid-ellipsoid, 3-sided compressed, 5.5–8.5 × 1.8–2.5 mm, papery, usually strigose, rarely glabrous; sessile. Seeds 7–11.
Phenology: Flowering late May–early Jul.
Habitat: Sagebrush or cushion plant communities of windswept summits and gullied slopes of low sandy or stony clay bluffs.
Elevation: 2100–2200 m.
Discussion
Astragalus drabelliformis is restricted to the upper Green River Valley between Big Piney and Daniel in Sublette County.
Selected References
None.