Stachys tenuifolia Willd.

Stems to 1 m, usually simple, glabrous or with some short stout hairs on the angles; lvs thin, oblanceolate to oblong, mostly 6–15 cm, acuminate, crenate-serrate, usually broadly obtuse to subcordate at base, glabrous or rarely with a few hairs; petioles of the main lvs 8–25 mm; bracts usually with a few low teeth; cal-tube 3–4.5 mm, almost always glabrous, the lobes lanceolate, glabrous, 2.5–3.5 mm; 2n=32. Moist soil, especially in shaded places; N.Y. to Mich. and Minn., s. to S.C. and Tex. June–Aug. Intermediates to no. 5 [Stachys hispida Pursh] are not uncommon northward.