Annual herb, erect with ascending branches, up to 55 cm high; indumentum of curved hairs only. Leaves sessile, linear or narrowly elliptic, 10–55 mm long, 1.5–3.5 mm wide; apex acute, mucro to 0.2 mm long. Inflorescence supra-axillary or axillary, a raceme to 50 mm long, not exceeding the leaves. Pedicel to c. 3 mm long. Alae perpendicular to deflexed in fruit (position), herbaceous, lanceolate or narrowly elliptic, slightly dimidiate to falcate, 7–9 mm long, c. 2.4–3.0 mm wide, with minute ± appressed to curved hairs or glabrescent, sometimes with straight hairs along margin. Corolla purple; floral appendages reduced, ± entire. Stamens terminate below stigma, monadelphous. Style shallowly hooked with small beak or protrusion on outer edge of bend, with somewhat flat stigma. Capsule perpendicular to deflexed, ± aligned with alae, lacking wing or with uneven wing, but winged capsules always present (wing c. 0.5 mm wide on one locule, 1–2 mm wide on the other), strongly asymmetrical, obovate or rhomboidal, 5–6 mm long, 2–3 mm wide; lobe apices rounded and strongly unequal. Seed obloid, 2.0–3.5 mm long, c. 1.5 mm wide, with indumentum of fine white hairs. Aril shape domed or round, c. 0.6 mm long, white, with hairs. Aril appendages 3, linear to narrowly triangular, c. 0.75 mm long.
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