Elymus trachycaulus (Link) Shinners
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Species Description - Tufted, 3–10(–15) dm; lvs usually flat, 2–6(–8) mm wide; scabrous to pilose at least on the upper side; auricles short or none; spikes 4–15(–25) cm, compact, the mostly solitary spikelets 9–16 mm, overlapping, 3–5(–7)-fld, readily disintegrating at maturity; rachilla generally villosulous; glumes lanceolate to oblong-elliptic, acute to short-awned, broad and 5–7-veined, with membranous margins, the first one 6–10 mm, the second 7–12 mm; lemmas 7.5–10(–13) mm, glabrous or scabrous distally and sometimes short-hairy on the margins, awnless or with a straight awn to as much as 3 cm; anthers 1–2 mm; 2n=28. Variable and often divided into several confluent vars. of dubious significance. Various habitats; Nf. to Alas., s. to W.Va., Ky., Ill., Mo., and Ariz. (Agropyron pauciflorum; A. richardsonii; A. subsecundum; A. tenerum; A. trachycaulum; A. caninum, misapplied) A hybrid with Hordeum jubatum has been called ×Elyhordeum macounii (Vasey) Barkworth & D. R. Dewey.