Stachys cordata Riddell
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Species Description - Stems 4–10 dm, usually simple, ± hirsute, chiefly on the sides but also on the angles, with pustulate, spreading hairs overlying a minute, stipitate-glandular puberulence; lvs lance-oblong or oblong-obovate, 6–14 cm, a third to half as wide, broadest near the middle, acute to acuminate, crenate, cordate at base, sparsely hirsute on both sides; petioles 1–5 cm; cal-tube 3–4.5 mm, the lobes half as long. Woods, chiefly in the mts.; Md. and Va. to Tenn.; also s. O. to s. Ill. June–Aug. (S. nuttallii; S. riddellii)