Stout and erect, 4-10 dm, with a sickly-sweet odor; stem sparsely hairy to densely white-tomentose; lvs sessile or nearly so, broad-based and often clasping, obtuse or rounded above, 2-5 נ1-4 cm, 1-2 times as long as wide, crenate-serrate, strongly rugose-reticulate, strongly villous-tomentose beneath, less so above; verticils crowded into elongate terminal spikes (sometimes interrupted below) 3-15 נ0.5-1 cm; cal 1-2 mm, short-hairy throughout; 2n=24. Native of s. Europe, escaped into waste places and along roadsides throughout s. U.S. and n. occasionally to Me. and O.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.