Bromus sterilis is an annual C3 grass (Williams et al. 2011), tufted, 30-80 cm tall, stems hairless; sheaths softly hairy, ligules to 0.2-0.3 cm, white, membranous, margin deeply toothed.
Leaves alternate, 0.2-0.4 cm wide, softly hairy.
Flower spikelets 1-2 per branch, each 2.5-3 cm long, not including awns, 4-8 flowered; glumes needle-shaped, unequal, the first 0.7-1.4 cm, the second 3-veined, 0.9-1.7 cm; lemmas narrow, 1.3-2 cm long, tip 2-toothed, with awn 2-3 cm long arising between teeth; inflorescence 10-20 cm long, branches elongate, thread-like, often drooping; blooming and fruiting May-Sept.
Frequency in NYC: Infrequent, (possibly mistaken for B. tectorum and undercounted).
Habitat: Open, dry soil, sandy fill, roadsides.