large-flowered evening primrose

... In Japan, there are about 20 species that are cultivated or naturalized, including evening primrose and moonflower, but the following are some of the more commonly seen species. O. erythrosepala Borb. (Large-flowered evening primrose) was introduced to Japan in the early Meiji period and grew in colonies on riverbanks and beaches throughout the country, but has now been replaced by Oenothera aree and has become extremely rare, and is instead found scattered in mountainous areas. The plant is 1.5m tall, the flowers are yellow and about 8cm in diameter, and the style is longer than the stamen. ...

*Some of the terminology that refers to "large-flowered evening primrose" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…　日本ではマツヨイグサやツキミソウをはじめ，20種近くが栽培されたり帰化しているが，ふつうに見られるものに次のものがある。　オオマツヨイグサO.erythrosepala Borb.(英名large‐flowered evening primrose)は，明治初年ころに日本に渡来し，全国的に河原や海浜に群生していたが，現在ではアレチマツヨイグサなどに置き代わられてめっきり少なくなり，むしろ山間部に散見されるようになった。草丈は1.5m，花は黄色で径8cm内外，花柱がおしべより長い。…

※「large-flowered evening primrose」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。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報