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(First upload on June 1 2010. Last on December 20 2018) [ 日本語 | English ]

Oenothera biennis L.






Mount Usu / Sarobetsu post-mined peatland
From left: Crater basin in 1986 and 2006. Cottongrass / Daylily

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.

索引

Oenothera biennis in Hokkaido


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ST3 ST3 ST3
[1/2] at an openland along Ishikari Coast, where a wind power will be established, on September 3 2015. [3] 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


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

ST1 ST2 ST3
[1-3] in a Miscanthus sinensis grassland on the Nishiyama Craters on July 27 2017.

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