Stems erect, usually several, 4-8 dm, glandular- puberulent in the infl, glabrous or often villous below; cauline lvs lanceolate to oblong, 5-12 cm, toothed or subentire, rounded or truncate at base; cal at anthesis 4-7 mm, at maturity more than half as long as the fr; cor 2-3 cm, the tube very slender, not widened distally, pale violet outside, pale-hairy inside but lacking purple lines, the mouth ±closed by the arched base of the lower lip, the lobes white. Dry woods and fields; Que. and Me. to Mich. and Wis., s. to Va. and Ky. May-July.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.