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(First upload on June 1 2010. Last on February 1 2024) [ 日本語 | English ]

Oenothera L. (マツヨイグサ) Mematsuyoigusa (メマツヨイグサ, 雌待宵草), common evening primrose Lifeform: usually categorized into biennial forb (changeable) Distribution: originally from north America, now naturalized worldwide (exotic to Japan) reported from Japan in Meiji Era Habitat: sunny sites, such as sandy or gravely beaches

生命環境野外実習 統合環境調査法実習 (fauna and flora 種リスト) flora on: Mount Usu, Mount Koma Seedbank: persistent (Tsuyuzaki 2006) Morphology: diverse - cp. O. glazioviana Leaf: sharp at the top of rosette leaf, somtimes reddish on the mid-vein Synonyms: Onagra biennis (L.) Scop.

Oenothera biennis in Hokkaido

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[1] at an openland along Ishikari Coast, where a wind power will be established, on September 3 2015. [2] at a roadside near North 26th Satsudora Drug Store, North Ward, Sapporo, on October 9 2023. [3] a giant rosette at a construction field in N24/W2, North Ward, Sapporo, on July 31 2009. We see a secondary succession there. [4] faced to Japan Sea in Tomamae where the construction of wind powers is planned, northern Hokkaido, on September 21 2017. [5/6] in a Hokko Green Space, East Ward, Sapporo, on September 1 2018.

Mount Usu

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[1-3] at a trail to go K-1 Crater created by the 2000 eruptions, taken on July 26 2013.

Oenothera parviflora L. in Hokkaido

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Arechimatsuyoigusa/Arejimatsuyoigusa (アレチマツヨイグサ/アレヂマツヨイグサ) Often merged with O. biennis

Distribution: north America Habitat: openlands, riversides, coasts, roadsides, etc.

Flower: developing gaps between the petals Chromosome number: 2n = 14

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[1-3] in a Miscanthus sinensis grassland on the Nishiyama Craters on July 27 2017.