Herbs robust or low, 10–60 cm, glabrous or ± hairy; with slender caudex. Stems 1–30+, decum­bent to ascending, unbranched, not fleshy. Leaves: stipules ovate to lanceolate, 2.5–5 mm, scar­ious, fragile; short- to (prox­imally) long-petiolate; rachis often curved, 1–2.5(–3) cm; leaflets 3–11, petiolulate, blades usually elliptic to obovate, sometimes lanceolate, 10–25 mm, apex usually acute, sometimes obtuse (often proximally), surfaces appressed-hairy to hirsute or glabrous. Peduncles ascend­ing, (1–)5–10(–12) cm, longer than subtending leaf, elongating in fruit, ± appressed-hairy; bract subtending umbel or absent, 1–3-foliolate. Umbels 1–6-flowered. Flowers 8–13 mm; calyx green, 3.5–6.5 mm, hairy, tube cylindric, 2.5–3.5 mm, lobes subulate, 1–3 mm, ciliolate; corolla whitish yellow or banner yellow, ± red-veined or reddish, and wings and keel white, keel apex yellow, wings ± equaling keel, claw ± equaling to slightly longer than calyx tube, banner implicate-ascending, keel apex subacute. Legumes ± ascending to ± inclined, brown, oblong, turgid, 25–50 × 1.5–2 mm, leathery, not septate, glabrous. Seeds (6–)8–15(–21), olive to reddish brown, oblong, 1.5–2 mm. 2n = 14.

Distribution

w United States, n Mexico.

Discussion

Varieties 2 (2 in the flora).

Selected References

None.

Lower Taxa

Hosackia oblongifolia var. cuprea, Hosackia oblongifolia var. oblongifolia

Key

1	Leaflets 7–11, blade surfaces hairy or glabrous; flowers 9–13 mm; ovules 9–15(–21).	Hosackia oblongifolia var. oblongifolia
1	Leaflets 3–7, blade surfaces glabrous; flowers 8–9 mm; ovules 5–8.	Hosackia oblongifolia var. cuprea