Diminutive erect branching annual 15–25 cm tall; stem wiry, subglabrous. Leaves simple, subsessile, without stipules; blades 4–12 × 1–2.5 mm, linear-lanceolate and acute above to oblanceolate-oblong and obtuse below, shortly rounded to the base, sparsely puberulous beneath. Racemes 2–4 cm long, laxly 3–6-flowered, with a few other flowers developing in the axils below; bracts 1–2 mm long, linear; pedicels 2–4 mm long, without bracteoles. Calyx 2–3 mm long, thinly appressed puberulous; upper lobes attenuate-triangular, 1.5 times as long as the tube. Standard obovate, yellow, lined and later flushed red, subglabrous; wings shorter than the keel; keel 4 mm long, angular, with a narrow twisted only slightly incurved beak. Pod sessile, 3 mm long, ovoid-globose, minutely puberulous, 1–2-seeded. Seeds 1.5 mm long, oblique-cordiform, smooth, with a prominent aril.
