Bromus is a large genus of grasses, classified in its own tribe Bromeae. They are commonly known as bromes, brome grasses, cheat grasses or chess grasses. Estimates in the scientific literature of the number of species have ranged from 100 to 400, but plant taxonomists currently recognize around 160–170 species. Bromus is part of the cool-season grass lineage, which includes about 3300 species. Within Pooideae, Bromus is classified in tribe Bromeae. Bromus is closely related to the wheat-grass lineage that includes such economically important genera as Triticum, Hordeum and Secale.
Etymology
The generic nameBromus is derived from the Latinbromos, a borrowed word from the Ancient Greek βρομός. βρομός and bromos mean oats, but βρομός seems to have referred specifically to Avena sativa and Avena barbata. The generic name comes from avēna, a native Latin word for "oats" or "wild oats".
Description
Bromus species occur in many habitats in temperate regions of the world, including Africa, America, Australia and Eurasia. There are considerable morphological differences between some species, while the morphological differences between others are subtle and difficult to distinguish. As such, the taxonomy of the genus is complicated. Bromus is distinguished from other grass genera by a combination of several morphological characteristics, including leaf sheaths that are closed for most of their length, awns that are usually inserted subapically, and hairy appendages on the ovary. The leaf blades and sheaths, which comprise the leaves can be hairless, sparsely hairy or hairy. The inflorescence is a dense or open panicle, usually drooping or nodding, sometimes spreading.
Bromus species are generally considered to have little economic value to humans, at least in present times. Bromus mango was historically cultivated in Chile and Argentina by indigenous peoples, who used it both as fodder and food. The Tarahumara Indians in northern Mexico use the grains of some native Bromus species to aid fermentation in making one of their cultural beverages. As names like poverty brome and ripgut brome attest, some species are not very useful as fodder because their leaves sclerotize quickly and may even be harmful to livestock due to the high silica content. Others, such as meadow brome, native to parts of Russia, are planted as forage in the Great Plains of North America. Brome grasses are not usually grown as ornamental plants due to most species' nondescript appearance. Some are useful to prevent erosion but such use must be cautiously controlled as most Bromus have the ability to spread, becoming invasive weeds. Cheatgrass is a particularly troublesome weed across much of western North America
s have generated various classification schemes to reflect the morphological variation that is seen in Bromus. In North America, five morphologically similar groups of species, called sections, are generally recognized: Bromus, Genea, Ceratochloa, Neobromus, and Bromopsis. Sections Bromus and Genea are native to the Old World, but many species are introduced into North America. Sections Bromopsis, Neobromus, and Ceratochloa have several native species in North America.
