Schedonnardus paniculatus (Nutt.) Branner & Coville
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Species Description - Culms 2–5 dm at anthesis; lvs usually clustered at base, the blade 3–5 cm × 1–2 mm; panicle constituting half to three-fourths the length of the shoot, rigid, with several very slender, widely divergent spikes 2–5 cm, the axis elongating after flowering, the whole panicle forming a loose spiral, breaking off and rolling before the wind; first glume 1.9–3.2 mm; second glume 2.6–4.3 mm; grain 2 mm; 2n=20, 30. Dry prairies; Ill. to Sask. and Ariz.; Argentina.