Herbs annual. Stems erect, sprawling, or climbing, slender to robust, 2–6 dm. Leaves 2–6 cm; tendrils simple or branched; stipules foliose, approaching leaflets in size, semisagittate, with nectariferous patch abax­ially; leaflets 6–16, blades oblong to lanceolate-linear, 8–20 × 1–5 mm, apex obtuse to truncate-emarginate, abaxial surface sparsely pubescent, hairs long, pustulose-based, adaxial glabrous. Inflorescences 1–3-flowered, 0 cm. Flowers 18–25 mm; calyx base symmetric, lobes unequal, abaxial lobe subequal to tube; corolla pale to bright yellow, banner stenonychioid, blade much longer than claw, glabrous; style compressed abaxially, pubes­cent apically, tufted abaxially. Legumes reddish black, elliptic, 25–35 × 7–14 mm, oblique-tipped, pilose, hairs tuberculate-based; stipe to 3–4 mm. Seeds 3–9, blackish and ± mottled, or velvety to entirely black, compressed-globose, 3 mm diam.; hilum whitish, linear, encircling 1/6–1/5 circumference of seed. 2n = 14.

Phenology: Flowering Apr–May.
Habitat: Roadsides, fields.
Elevation: 0–500 m.

Distribution

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Introduced; Ala., Calif., Fla., La., N.C., Oreg., Tex., c, s Europe, w Asia, n Africa.

Discussion

Selected References

None.

Lower Taxa

None.