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''Bromus'' is a large genus of the grass family (Poaceae). 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. They are commonly known as bromes, brome grasses, cheat grasses or chess grasses. ''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''. βρομός and bromos mean ''oats'', but βρομός seems to have referred specifically to ''Avena sativa'' (Hp.Vict.2.43, Dsc.2.94, Polem.Hist.88) and ''Avena barbata'' (Thphr.HP8.9.2, Ps.-Dsc.4.137). The generic name ''Avena'' is another Latin word for ''oats'' or ''wild oats''. == Description == ''Bromus'' species occur in many habitats in temperate regions of the world, including America, Eurasia, Australia, and Africa. 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''). 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「bromus」の詳細全文を読む スポンサード リンク
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