Culms slender, erect, 4-8 dm, without rhizomes; lvs 1-2 mm wide, the longer ones crowded toward the base of the stem, the upper only 3-8 cm; ligule round-ovate, 1-2 mm; infl loose and open, often nodding, the slender branches paired, bearing spikelets above the middle; spikelets 4-6 mm, 2-4-fld; glumes narrowly ovate, obtuse, 3-veined, the first 2.5-3.5 mm; the second 3-3.8 mm; lemmas 2.5-4.5 mm, distinctly 5-veined, villous on the keel and marginal veins and webbed at the base; anthers 1.1-1.4 mm; 2n=28. Moist woods; O. to Minn., Mo., and e. Nebr.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.