Oenothera odorata; evening primrose

Japanese: マツヨイグサ(待宵草) - マツヨイグサ（英語表記）Oenothera odorata; evening primrose

A perennial plant of the Onagraceae family. Native to South America and Chile, it was introduced to Japan at the end of the Edo period, where it was planted in gardens for decorative purposes, but has now escaped and is occasionally seen growing wild in various places. The stem is upright, 60-90 cm tall, and the basal leaves form a rosette. The leaves are alternate, linear lanceolate, and sparsely serrated. From May to August, yellow four-petaled flowers bloom one at a time in the leaf axils. The flowers open in the evening, turn red by the next morning, and wilt. The capsule is four-lobed, and the lobes are slightly curled.

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:

アカバナ科の多年草。南アメリカ，チリの原産で江戸時代の末に日本に渡来し，当時は観賞用として庭に植えられたが，現在では逸出して各地にときおり自生しているのがみられる。茎は直立し，高さ 60～90cmで根出葉はロゼットをつくる。葉は互生し線状の披針形でまばらに鋸歯がある。5～8月頃，葉腋に黄色の4弁の花を1個ずつつける。花は夕方開き翌朝には紅色に変ってしぼむ。蒴果は4裂し，裂片は多少巻く。

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