Stems erect from slender rhizomes, with spreading glandular hairs below, glabrous above or sparsely puberulent on the angles with curved-ascending hairs; foliage lvs lance-ovate to round-ovate, the larger 2-4.5 cm, two-thirds as wide or wider, few-toothed, broadly rounded to subcordate at base, the lowest short-petioled, the upper sessile; lvs subtending the fls progressively reduced and narrower, often acute, the upper entire; pedicels 2-3.5 mm; cor blue, 8-10 mm; its lower lip hirtellous in 2 lines. Moist woods; May, June. Two vars.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.