This species is infrequent to frequent in the lake area and southward to the center of the state in moist, black soil about lakes, in marshes, and in roadside ditches. South of this area it becomes infrequent to very rare or possibly absent in a few counties of the unglaciated region.
Twigs dull brown or yellow-brown; lvs relatively narrow, oblanceolate, 3-4+ times as long as wide, finely and sharply toothed; infl evidently puberulent, as also the hypanthium and the usually obtuse sep. Wet meadows, swamps, and shores; relatively western, from Alta. and N.D. and S.D. to w. Que., s. to Ind., Mo., and N.C.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.