Plants cespitose, rhizomatous. Culms 65–210 cm tall, 3–5 mm thick. Leaves exceeded by the inflorescences; auricles absent; ligules 0.5–2 mm, truncate, erose; blades 6–15 mm wide, both surfaces glabrous, adaxial surfaces with numerous closely spaced, unequal veins. Inflorescences 15–35 cm long, 9–25 mm wide, usually spikes, with 2–6 spikelets per node, occasionally some nodes with 1–2 branches, branches to 60 mm, strongly ascending; internodes 8–10 mm, usually glabrous, sometimes scabrous. Spikelets 17–25 mm, pedicellate, pedicels 0.5–2(5) mm, with 6–9 florets. Glumes 9–25 mm long, differing in length by 1–4 mm, usually exceeding the lowest lemmas, 0.5–2.5 mm wide, subulate to narrowly lanceolate, stiff, keeled, the central portion thicker than the margins, tapering from the bases, glabrous, smooth proximally, scabrous distally, 1(3)-veined, veins inconspicuous at midlength; lemmas 8–12 mm, glabrous, acute to awned, awns to 1.8 mm; anthers about 6 mm, indehiscent. 2n = 42.
Leymus ×multiflorus is a sterile hybrid between Leymus condensatus and L. triticoides that occurs near the coast of central and southern California.