Bromus arvensis is an annual or biennial grass with erect culms growing Template:Convert tall. The grass has an extensive fibrous root system. The leaf sheaths are softly pubescent and leaf blades are pubescent on both faces. The leaf blades are Template:Convert long and Template:Convert wide. The obtuse ligules are Template:Convert long. The large, open panicles are Template:Convert long and Template:Convert wide, with ascending branches that droop at their ends. The straight or slightly curved branches are typically longer than the spikelets. The lanceolate spikelets are Template:Convert long and become purplish at maturity. The spikelets have long pedicels and are five to twelve flowered. The bases of florets can be concealed or obvious at maturity. The glumes are glabrous. The lower glumes are three-veined and Template:Convert long, and the upper glumes are five-veined and Template:Convert long. The obtuse and glabrous or slightly scabrous lemmas are Template:Convert long and Template:Convert wide, and have seven faint nerves. The margins are translucent and end in lengthy and acute teeth. The awns are straight and Template:Convert long. The anthers are approximately Template:Convert long. The caryopses are shorter than the paleas and can be either weakly or strongly rolled inwards.<ref name=Manual>Template:Cite book</ref><ref name=Flora>Template:Cite book</ref>
The grass flowers in June and July.
Habitat and distribution
Bromus arvensis grows along roadsides, in disturbed areas, and in fields. It is native to southern and central Europe, but is now naturalized as a weed throughout temperate regions including North America and Asia. The grass is a soil improver and is useful for erosion control.<ref name=Flora/><ref>Template:Cite book</ref>