Rather frequent in the southern third of the state in moist soil in woodland, becoming rare northward, and probably absent from our northern counties. It is found in moist woods of all kinds. I have a white-flowered specimen from Spencer County. I have had it in cultivation for many years, and it is so prolific that each year many seedlings must be weeded out.
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.