Herbage villosulous or villous and pilosulous, hairs obscurely malpighian, gray or silvery, mostly twisted and loose. Stems 2.5–15 cm. Leaves 1.5–8 cm; leaflets (9 or)11–17, blades narrowly elliptic or oblong-elliptic, 3–16(–20) mm, apex acute or shortly acuminate, surfaces pubescent; terminal leaflet decur­rent or obscurely jointed. Racemes 9–17-flowered; axis 2–5.5 cm in fruit. Flowers: calyx 3.7–4.7 mm, tube 2.4–2.8 mm, lobes 1.1–2.4 mm; corolla whitish or ochroleucous, sometimes faintly lavender-tinged or -veined; banner 9.2–10.4 mm; keel 7.7–8.3 mm. Legumes linear-oblong, 14–17 × 2.5–3 mm, minutely villosulous, hairs twisted. Seeds 6–13.

Phenology: Flowering Jun–Aug.
Habitat: Pine woodlands, sagebrush flats.
Elevation: 1200–1300 m.

Distribution

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Idaho, Mont.

Discussion

Variety crispatus is among the most restricted of the varieties in the species, occurring only in the Bitterroot Mountains, in east-central Idaho and adjoining Montana. It is geographically peripheral to var. tenuifolius, and some plants intergrade.

Selected References

None.

Lower Taxa

None.