Perennial 3–5 dm; stems one or few from a thick woody rhizome-caudex, mostly simple, finely glandular-villous above, sparsely hairy or glabrate below; lvs cauline, rhombic-ovate to deltoid, 5–8 cm, acute, coarsely crenate-serrate above, toward the base entire and abruptly narrowed to a cuneate base decurrent along the petiole almost to the stem; infl interrupted, long-peduncled above the scarcely reduced upper lvs, 1–2 dm; fls 6–10 per node, the bracteal lvs ovate, 2–3 mm, caducous; cal at anthesis 4–5 mm, glandular-punctate, the upper lip 3-toothed, half as long as the tube and about as long as the lower lip; cor blue, 10–13 mm, the upper lip much shorter than the lower. Woods and thickets; Pa. to S.C. and Ga., w. to Ala., Tenn., and w. Ky. May, June.
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