ryegrass

Japanese: ryegrass

...One- to two-year-old grass of the Poaceae family used as pasture (illustration). Also called mouse barley. The genus Lolium is commonly called ryegrass, and this name comes from the fact that it was first cultivated in Italy. It is native to the Mediterranean coast, and is now cultivated in temperate regions around the world, and has also become naturalized. It was introduced to Japan in the early Meiji period. It grows in a clumping pattern, with a height of about 40 to 80 cm. Young leaves emerge rolled into a cone shape, and in early summer it produces flat ears with two rows of spikelets. ...

From "Dokumugi (Poisonous Barley)"

...It is not poisonous unless it is infected by a fungus. Plants of the Lolium genus are called rye grasses in English, and many of them are used as pasture grass. Lolium multiflorum Lam. (also known as Italian rye-grass) and Lolium perenne L. (also known as perennial rye-grass), which have awns on their spikelets, are both native to Europe and were imported for pasture and lawn use, respectively, but escaped and became naturalized plants. ...

*Some of the terminology explanations that mention "ryegrass" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…牧草として利用するイネ科の一～二年草（イラスト）。ネズミムギともいう。ドクムギ属Loliumを一般にライグラスryegrassと呼び，この種はイタリアで栽培が始まったところからこの名がついた。原産地は地中海沿岸で，現在では世界中の温帯で栽培がみられ，また野生化もしている。日本へは明治初期に渡来した。草高は40～80cmほどで叢生（そうせい）する。若い葉は円錐状に巻いて現れ，初夏に小穂が2列に並んだ平たい穂を出す。…

【ドクムギ(毒麦)】より

…菌に侵されなければ毒ではない。　ドクムギ属Loliumの植物は英名をrye grassといい，牧草になるものが多い。小穂に芒（のぎ）のあるネズミムギL.multiflorum Lam.(別名イタリアンライグラスItalian rye‐grass)やホソムギL.perenne L.(別名ペレニアルライグラスperennial rye‐grass)はともにヨーロッパ産でそれぞれ牧草，芝生用に輸入されたが逸出して帰化植物となった。…

※「ryegrass」について言及している用語解説の一部を掲載しています。

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