Bromus madritensis (also, B. matritensis) is a species of brome grass known by the common name compact brome.
An annual herb with solitary or caespitose, erect culms. Leaf-sheaths are hirsute; the leaf-blade surface is also hirsute on both sides. Inflorescence is a tightly congested panicle with densely pubescent axis, and solitary spikelets. Fruit is an apically hairy caryopsis with adherent pericarp.
Global Range: Bromus rubens was introduced into the United States from southern Europe in the mid 1800s (Burcham 1957). Most likely the introduction of this species, along with other annual exotic species with low forage value, was unintentional. By 1870 red brome was abundant in California's overgrazed rangelands (Burcham 1957). This species occurs throughout western United States from Washington to California, east to Arizona, Utah and Texas, and spotted throughout the country to Massachusetts; it is especially prevalent in the Pacific region (Hitchcock 1950, Gould 1951, Kearney and Peebles 1951).