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Corolla 10–15 mm long; standard red, 10–15 × 8–12 mm, the lamina suborbicular, truncate-retuse, abruptly narrowed to a broad claw c. 4 mm long; wings blue, 8–12 mm long, the lamina twice as long as the claw, oblong-obovate, obtuse, with a very long conjunctival flap above the acute auricle; keel usually c. 2 mm shorter than the wings, the lamina arcuately ascending, deltoid-subquadrate, as long as the claw, with a short obtuse auricle.
Annual; stem winged, often branched from the base, to 1 m; stipules lanceolate, with a short basal lobe; lfls lance-linear, 2–5 cm; peduncles 3–10 cm, with 1–3 violet to pink or white fls 1–1.5 cm; cal-lobes ovate or lance-ovate, subequal, 2.5–3.5 mm, acuminate, about equaling the tube; fr 2–5 cm, papillose-hirsute, 5–10-seeded; 2n=14. Native of Europe, intr. in se. Va. and at scattered stations in s. U.S.
Flowers 1–3(4) in axillary racemes; peduncle 50–80(200) mm long, usually longer than the subtending leaf, slender; bracts up to 1.7 mm long, subulate; pedicels 4–6 mm long, glabrous or sparsely glandular-pubescent.
Pod 25–50 × 6–8 mm, linear-oblong, abruptly narrowed at both ends, laterally compressed, brown or yellowish with tubercle-based long silky hairs and small sessile glands.
Calyx 6–8 mm long, glabrous; tube c. 2 mm long, lobes 3.5–4 mm long, subequal, ovate-lanceolate, acuminate.
Climbing annual herb sparsely pubescent on the young vegetative parts.
Seeds 3–10, globular or subglobose, tuberculate, brownish or blackish.
Stem up to c. 80 cm long, winged, glabrous; wings 0.5–2.5 mm wide.
Vexillary stamen free; filament sheath c. 3.5 mm long.
