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Annual; stems decumbent to erect, hairy, 2-25 cm tall, simple or branched. Lvs sessile or the lower with a petiole to 5 mm long. Lamina 5-12-(20) × 3-12 mm, ovate to suborbicular, hairy, sometimes hairs confined to veins, irregularly serrate or dentate-serrate; base truncate to subcordate; apex obtuse to rounded. Infl. a terminal raceme with fls extending almost to base of plant; bracts > fls, dissimilar to all but uppermost lvs, smaller, lanceolate or elliptic-lanceolate, entire or few-toothed; pedicels < 1 mm long at anthesis, much < bracts. Calyx 3-4 mm long; lobes lanceolate to elliptic, obtuse; hairs simple, sometimes glandular hairs also present. Corolla c. 2 mm diam., blue. Capsule 2.5-3.5 mm wide, 2-lobed, obcordate; nerves inconspicuous; margins ciliate or sometimes glandular-ciliate. Seeds flattened, generally oblong-ellipsoid.
Erect or ascending annual 0.5–3 dm, somewhat villous-hirsute below, usually more puberulent above; main lvs ovate or broadly elliptic, palmately veined, 0.5–1.5 cm, 1–2 times as long as wide, crenate-serrate, the lower generally short-petiolate; infl terminal, the bracts alternate; fls subsessile; cor blue-violet, 2–2.5 mm wide; mature pedicels only 1–2 mm; fr 3 mm, obcordate, ciliate-margined, with subglabrous sides; style 0.4–1 mm; seeds (5–)8–11 per locule, 0.8–1.2 mm; 2n=14, 16. Native of Eurasia, established as an inconspicuous weed in gardens, lawns, and fields in much of N. Amer. Apr.–Sept.
