Lycopus americanus Muhl.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Species Description - Rhizomes elongate, without tubers; lvs glandular- punctate and usually glabrous (or scabrous above) except along the veins beneath, where provided with short hairs only 0.1–1.5 mm, the blade lanceolate or narrowly oblong to nearly linear, 3–8 cm, tapering to a short petiole or narrow, subpetiolar base, coarsely and irregularly incised-toothed or subpinnatisect, the lower teeth the larger; bracts lanceolate and about equaling the cal, avg 3 mm; cal 2–3.3 mm, its 5 lobes narrow, firm, slenderly subulate-pointed, surpassing the nutlets; cor 4-lobed, the upper lobe broader and notched; anthers 0.25–0.5 mm; nutlets 1.0–1.4 × 0.7–1.0 mm, the outer apical margin smooth and broadly rounded, the corky lateral ridges confluent around the tip, the inner angle much shorter than the outer ones, so that the center of the set of nutlets is depressed; 2n=22. Our most abundant sp.; Nf. and Que. to B.C., s. to Fla. and Calif.