Hordeum leporinum Link
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Species Description - Annual to 4(–6) dm; lvs flat, 2–5 mm wide, glabrous or hairy; auricles well developed, to 3.5 mm; spikes 4–7(–10) cm (excl. awns), erect, often partly enclosed in the inflated upper sheath; all 3 spikelets of the triad well developed, the central one sessile, its floret on an elongate rachilla-joint 1–2 mm and equaling or even surpassing the pedicels of the lateral spikelets; lateral spikelets usually staminate; glumes 15–22(–28) mm, those of the central spikelet and the inner glumes of the lateral spikelets ± lanceolate, 3-nerved and ciliate on the margins, the nerves scabrous, the outer glumes of the lateral spikelets awn-like and somewhat longer, scabrous; fertile lemma (6–)7–10 mm, glabrous, 5-veined, those of the lateral spikelets somewhat larger, 7–20 mm, sterile, all 3 lemmas tapering into awns 18–30 mm; anthers 0.8–1.2 mm; 2n=14, 28, 42. Moderately moist waste places; native of s. Europe, intr. and well established in w. U.S., sporadic with us. Perhaps better subordinated to no. 5 [Hordeum murinum L.]