Standard elliptic, pale yellow, with a darker red-fringed mark at the base inside, reddish veined and glabrous outside; wings brighter yellow, shorter than the keel; keel 4–6 mm long, bent at right angles in the lower third, with long narrow forwardly projecting beak.
Leaves subsessile, simple; blades c. 2–6(8) × 0.2–0.5 cm, mostly linear-oblong to narrowly elliptic, but the basal ones often broader, elliptic to ovate, sparsely puberulous beneath; stipules up to 1–3 mm long, setaceous.
Racemes slenderly pedunculate, lax, mostly 1–3-flowered; bracts up to 1 mm long, setaceous; bracteoles at the top of the pedicel, similar.
Small erect annual, 5–25(40) cm tall, sometimes much branched; stem very slender, with small scattered appressed or spreading hairs.
Calyx 2.5–4 mm long, puberulous; lobes acuminately triangular, a little longer than the tube.
Pod 8–13 × 2–3 mm, sessile, narrowly cylindrical, rather sparsely pubescent, c. 15–20-seeded.
Seeds c. 1 mm long, cordiform, smooth to slightly rugulose, reddish-brown.