Annual herb, erect with ascending branches, rarely decumbent, up to 80 cm high; indumentum of curved and straight hairs. Base of stem often tinged red or maroon. Leaves linear to oblong, narrowly elliptic or lanceolate, 8–70 mm long, 1–7 mm wide; apex acute, obtuse or rounded, mucro 0–0.5 mm long; petiole 0–1 mm long. Inflorescence supra-axillary or leaf-opposed, a raceme to 60 (–80) mm long, usually not exceeding the leaves, sometimes longer than leaves. Pedicel to 1.5 mm long. Alae perpendicular, rarely antrorse or deflexed in fruit (position), herbaceous, broadly ovate, dimidiate, 3.5–7.0 mm long, 2–5 mm wide, with curved and long straight hairs. Corolla purple or blue; floral appendages entire and bent at right angles to apex of keel to form a horizontal platform; upper petal claw 1.5 mm wide. Stamens terminate well below stigma, monadelphous; staminal flap c. 0.5 mm wide. Style curved, slightly capitate at apex, ± terete at base, becoming dorso-ventrally flattened below hook and twisting in apical half, with flat stigma on inner surface immediately below apex. Capsule deflexed (apex of alae diverging at c. 45° from capsule), with wing (the wing 0.2–1.4 mm wide, usually widest at apex of locules or capsule lobes), ± symmetrical, very widely ovate to very widely obovate or orbicular to squarish, 3.2–4.4 mm long, 3.5–4.0 mm wide; lobe apices rounded and separated. Seed ovoid, 3.0–3.5 mm long, 1.5–1.9 mm wide, with indumentum of fine white becoming ferruginous hairs. Aril head round, c. 0.5 mm long, brown cap on white, with a tuft of hairs. Aril appendages 3, spathulate, rarely linear, 0.75–2.3 mm long.
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