Mary E. Barkworth, Julian J.N. Campbell and Bjorn Salomon
Plants rhizomatous. Culms 30–100 cm, ascending or erect, glabrous, mostly smooth, sometimes scabrous below the nodes. Leaves evenly distributed; sheaths glabrous; ligules to 0.5 mm; blades 10–25 cm long, 2–7 mm wide, involute when dry, both surfaces scabrous, adaxial surfaces sparsely pilose, hairs 0.7–1 mm. Spikes 5.5–13 cm long, 0.4–0.6 cm wide, with 1 spikelet per node; internodes 3.5–5 mm. Glumes 8–18 mm, equaling or exceeded by the adjacent lemmas, more or less flat, 5–9-veined, margins unequal, the wider margins to about 0.3 mm, narrowly acute, sometimes awned, awns to 1 mm; lemmas 7.5–15 mm, smooth and glabrous proximally, scabrous distally, mucronate or awned, awns to 3 mm; anthers 1.5–2 mm.
Elymus ×pseudorepens consists of hybrids between E. lanceolatus and E. trachycaulus . It appears to be fairly common, having been reported from Alberta to Michigan and south toArizona, New Mexico, and Arkansas.