Annual herb, erect, rarely with ascending branches, up to 55 cm high; indumentum of curved hairs. Leaves sparse and caducous, ± sessile, linear, 22–75 mm long, 0.75–1.50 mm wide; apex acute, mucro 0–0.2 mm long. Inflorescence supra-axillary or axillary, a raceme to 300 mm long, exceeding the leaves. Pedicel to 5 mm long. Alae perpendicular to deflexed, occasionally reflexed or ascending in fruit (position), herbaceous, lanceolate, narrowly elliptic or oblanceolate, dimidiate to falcate, 4.9–7.0 mm long, 1–2 mm wide, with minute curved hairs or glabrescent. Corolla purple; floral appendages bifid, each appendage shortly divided; upper petal claw 1.25 mm wide. Stamens terminate at stigma, monadelphous; staminal flap 1 mm wide. Style slightly curved and twisted, ± terete, truncated into a narrow hammer head above stigma, with somewhat flattened stigma. Capsule reflexed or perpendicular, ± aligned with alae, lacking wing, symmetrical, obovate or squarish, emarginate with acute apex to capsule lobes, 5.8–7.0 mm long, 3.1–3.4 mm wide; lobe apices acute or subacute and separated. Seed obloid, 4.0–4.8 mm long, c. 1.5 mm wide, with indumentum of fine white hairs. Aril head an elongated helmet shape, 1.0–1.3 mm long, white, sometimes pale brown, hairy, often obscurely so. Aril appendages 3, ± linear, 0.5–0.9 mm long.
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