Bromus secalinus is an annual C3 grass (Williams et al. 2011), 30 cm to 1.2 m tall; stems sometimes hairy below nodes; upper sheaths with conspicuous veins, lower sheaths sometimes hairy, ligule 0.1-0.3 cm.
Leaves alternate, blade 0.3-0.8 cm wide, rough above, often finely hairy.
Flower spikelets 1-2.5 cm drooping 6-12 flowered; glumes slightly unequal, the second to 0.8 cm; lemma 0.6-0.9 cm, awn to 0.6 cm or none, apical teeth broad, margins of lemmas curling inward forcing florets apart and exposing axis; inflorescence open, loose 7-15 cm long, branches mostly longer than spikelets; blooming and fruiting June-Sept.
Wetland status: NL.
Frequency in NYC: Very infrequent.
Habitat: Open sites, roadsides.