Stems weak, 2–4 dm, often decumbent below, glabrous below, finely glandular-puberulent above; lower lvs petioled; main lvs sessile, triangular-ovate or oblong-ovate, 2–5 cm; fls mostly in 1–3 whorls of 4–6 fls each, the pedicels 5–20 mm; cal-lobes narrowly triangular, 4–5 mm; cor-tube 3–4 mm; upper lip normally white, varying to pale blue, 6–10 mm; lower lip bright blue, 8–12 mm; cor-lobes emarginate; upper stamens with pubescent filaments; sterile filament 1 mm, fleshy, projecting at right angles from near the base of the cor-tube; seeds usually 4, 2.5–3 mm, the ventral concavity large and conspicuous; 2n=14. Rich moist woods, especially in alluvial soil; N.Y. to Mich. and s. Wis., s. to w. Va., Ky. and Ark. Apr., May.
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