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Bromus | |
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Bromus pubescens | |
Scientific classification | |
Kingdom: | Plantae |
Clade: | Tracheophytes |
Clade: | Angiosperms |
Clade: | Monocots |
Clade: | Commelinids |
Order: | Poales |
Family: | Poaceae |
Clade: | BOP clade |
Subfamily: | Pooideae |
Supertribe: | Triticodae |
Tribe: | Bromeae Dumort. (1824) |
Genus: | Bromus Scop. |
Sections | |
Synonyms [1] | |
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Bromus is a large genus of grasses, classified in its own tribe Bromeae. [2] [3] 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 (subfamily Pooideae), which includes about 3300 species. Within Pooideae, Bromus is classified in tribe Bromeae (it is the only genus in the tribe). Bromus is closely related to the wheat-grass lineage (tribe Triticeae) that includes such economically important genera as Triticum (wheat), Hordeum (barley) and Secale (rye).
The generic name Bromus is derived from the Latin bromos, a borrowed word from the Ancient Greek βρομός (bromós). βρομός and bromos mean oats, but βρομός seems to have referred specifically to Avena sativa (Hippocrates On Regimen in Acute Diseases 2.43, Dioscorides Medicus 2.94, Polemo Historicus 88) and Avena barbata (Theophrastus Historia Plantarum 8.9.2, Pseudo-Dioscorides 4.137). The generic name comes from avēna, a native Latin word for "oats" or "wild oats".
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 (usually those species that are closely related) 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 (connate) 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 (as in Japanese brome, B. japonicus).
The caterpillars of some Lepidoptera use Bromus as a foodplant, such as the chequered skipper (Carterocephalus palaemon).
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. [4] 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 (B. sterilis) and ripgut brome (B. diandrus) 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 ( Bromus riparius ), 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 ( Bromus tectorum ) is a particularly troublesome weed across much of western North America (from southern British Columbia to California.)
Taxonomists 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 (Eurasia), but many species are introduced into North America. Sections Bromopsis, Neobromus, and Ceratochloa have several native species in North America.
Bromus ramosus, the hairy brome, is a bunchgrass in the grass family Poaceae, native to Europe, northwest Africa and southwest Asia. The name Bromus comes from the term brome, meaning oats. Unlike most other bromes, it grows in shady sites under trees.
Claviceps purpurea is an ergot fungus that grows on the ears of rye and related cereal and forage plants. Consumption of grains or seeds contaminated with the survival structure of this fungus, the ergot sclerotium, can cause ergotism in humans and other mammals. C. purpurea most commonly affects outcrossing species such as rye, as well as triticale, wheat and barley. It affects oats only rarely.
Bromus hordeaceus, the soft brome, is an annual or biennial species of grass in the grass family (Poaceae). It is also known in North America as bull grass, soft cheat, and soft chess.
Bromus diandrus is a species of grass known by the common names great brome and "ripgut brome".
Bromus sterilis is an annual or biennial species of bromegrass known as barren brome, poverty brome, and sterile brome.
Pigeon Island is a small island located need the middle of the Wallabi Group of the Houtman Abrolhos, an archipelago off the coast of Western Australia. It is almost entirely given over to western rock lobster fishers' camps, and as a result is far more disturbed than most other islands in the archipelago. A nearby island also seasonally populated by fishers is named Little Pigeon Island, hence Pigeon Island is sometimes referred to as "Big Pigeon Island".
Bromus madritensis is a species of brome grass known by the common name compact brome. The specific epithet madritensis refers to Madrid, Spain. It has a diploid number of 28.
Castilleja grisea is a rare species of Indian paintbrush known by the common name San Clemente Island Indian paintbrush. It is endemic to San Clemente Island, one of the Channel Islands of California. San Clemente Island is owned by the US Navy so the Navy is involved in a management program to recover this species.
Bromus maritimus is a species of brome grass known by the common names maritime brome and seaside brome. It is native to the coastal areas of California and Oregon.
Bromus kalmii, Kalm's brome, is a species of brome grass. It is a native bunchgrass in the North-central and Northeastern United States, the Great Lakes region, and eastern Canada. The specific epithet kalmii refers to its discoverer Pehr Kalm.
Bromus commutatus, the meadow brome, is an annual or biennial species of plant in the grass family Poaceae. In the United States it is known as hairy chess.
Bromus inermis is a species of the true grass family (Poaceae). This rhizomatous grass is native to Europe and considered invasive in North America.
Bromus rigidus, the ripgut brome, is a grass native to Eurasia and naturalized in North America. The specific epithet rigidus means rigid or stiff.