Loosely tufted, slender, 3-7 dm; lvs narrowly linear, 15-30 cm, tapering to a very long slender point, the larger ones 3-5 mm wide; infl compound, loosely branched, the fls in terminal clusters of (2)3-6(-8); tep white or rose-tinged, lance-acuminate, the pet 3-3.8 mm, the sep 0.5 mm shorter; fr red-brown, round-ovoid, about equaling the sep; seed ellipsoid, 1-1.3 mm, with a pale, ridge-like raphe extending along one side and slightly prolonged at the tip; 2n=12, 24. Native of Europe, intr. in Vt., Ont., N.Y., and Minn. (L. nemorosa, a preoccupied name)
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.