Perennial; stems 2–12 dm, subterete, rather densely pale-hairy; lvs ovate, elliptic, or suborbicular, 3–10 × 1.5–5 cm, sessile or nearly so, thick, sharply serrate to incised, hirsute and rugose above, densely hirsute-villous and veiny beneath; spikes solitary or several, long, thick, remaining compact; bracts lance-subulate, about equaling the cal, hirsute, ciliate; cal 4–5 mm, densely hirsute, its lobes acuminate; cor mostly deep blue or purple, the tube a little exserted, hairy, the limb 7–9 mm wide; nutlets ellipsoid, 2–3 mm, raised-reticulate above, strongly striate below; 2n=14. Prairies, barrens, fields, and roadsides; Ont. and O. to N.D. and Wyo., s. to Tex. and N.M., and intr. into e. U.S. from Mass. to Del. and W.Va. June–Sept.
Roadsides and other dry open places. Prairies, glades, thickets, fields, waste ground and along railroads and roadsides.
Can be grown by cuttings, divisions or seedlings. Seeds needs stratification.
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