Stems 2-6 dm, villous; cauline lvs 2-3 pairs, broadly cordate- ovate, 4-8 cm, coarsely toothed, sparsely hairy, the petiole often longer than the blade; lowest pair of bracteal lvs resembling the foliage lvs and scarcely smaller, but sessile, the upper ones progressively reduced; cal 8-10 mm, the lobes slightly shorter than the tube; cor pale greenish-yellow or greenish-white, 3-3.5 cm, the lower lip with purple lines. Rich woods; w. Va., s. O., s. Ind., and s. Ill., s. to e. Tenn. and n. Ala. May-July.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
This mint is local and rare in the state but where it is found there are usually several plants in a colony or it is found growing for some distance in its restricted habitat. It grows in deep leaf mold in cool, moist places, usually toward the bases of deep, wooded ravines. Rarely found in level woods where it grows in dense shade.