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Annual, 5–35 cm tall; stems covered with spreading crisped, often glandular, hairs. Leaves ovate to ovate-lanceolate, 0.5–2.5(–4.8) x 0.2–0.6(–0.9) cm, acute at the apex, usually sparsely pubescent. Flowers sessile or subsessile. Calyx-tube 1.1–2 mm long, sparsely hairy; lobes 1.3–2 mm long. Petals yellow, 1–1.3(–1.6) mm long. Filaments with small hairy scale-like appendage at base; anthers 0.15–0.4 mm long. Styles 0.7–1.3 mm long, glabrous. Capsule 1.4–2.2 mm long. Seeds with indistinct longitudinal ridges.