Plants somewhat coarse, 15–40 cm, strigulose to villosulous, hairs basifixed; from superficial caudex. Stems erect to ascend­ing, with 2–5(–7) well-developed internodes, strigulose to villosu­lous. Leaves (6–)8–18(–21) cm; stipules 3.5–9 mm, membranous becoming papery; leaflets (17–)23–41, blades lanceolate-oblong, lanceolate-ovate, oblanceolate, or narrowly elliptic to linear, 5–21 mm, apex obtuse, retuse, or acute, surfaces glabrous, or glabrate adaxially. Peduncles erect, 10–20 cm, together with racemes longer than stems. Racemes 8–21-flowered, flowers spreading to nodding; axis (2.5–)4–10 cm in fruit; bracts 2.7–5.5 mm; bracteoles (0 or)2. Pedicels 1.4–5.4 mm. Flowers (15.2–)16.2–24(–25.3) mm; calyx short-cylindric, (8.9–)10.7–14.8 mm, strigulose to villosulous, tube (6.2–)6.8–9.8 mm, lobes subulate, (2.2–)3–5 mm; corolla white or creamy white, immac­ulate; banner recurved through 90°; keel (12.1–)13–16.3 mm. Legumes erect, stramineous or brownish, straight or slightly incurved, obliquely ovoid-acuminate to broadly lanceoloid-ellipsoid or oblong-ellipsoid, subterete, somewhat obcompressed, (15–)17–30 × 7–10 mm, unilocular or incompletely bilocular, fleshy becoming stiffly leathery or woody, glabrous; septum 0–0.9 mm wide; sessile. Seeds 25–36.

Phenology: Flowering Apr–Jul.
Habitat: Ponderosa pine forests, often where dry.
Elevation: 900–1600 m.

Distribution

• Generated Map
• Legacy Map

Idaho, Oreg., Wash.

Discussion

Astragalus reventus is restricted to the Blue Mountains of northeastern Oregon and southeastern Washington, as well as Ada County, Idaho.

Selected References

None.

Lower Taxa

None.