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| May 2007 at roadside |
May 2007 at roadside |
May 2007 at roadside |
| Family | Onagraceae |
| Tribe | Onagreae |
| Scientific name | Oenothera stricta Ledebour ex Link |
| Synonyms | Oenothera odorata Jacquin; Oenothera sulphurea auct. Raimannia odorata Sprague & Riley |
| Common name | (Japanese common name) matsu-yoi-0gusa (マツヨイグサ, 待宵草 [meaning: waiting evening weed]) |
| (English common name) evening primrose, Chilean evening-primrose, South-American evening-primrose, sweet sundrop | |
| Distribution | (Japan) Hokkaido, Honshu, Shikoku, Kyushu, Okinawa |
| (Other nations) [native] South America (naturalized worldwide) | |
| Habitat | Riverside, field |
| Chromosomal number | 2n=14 (2x) |
| Description | Plants electing 30-150cm tall. Leaves 6-10cm long, 0.6-1.2cm wide. Flowers yellow petals each 1.5-2.5cm long, flowering in May to November. Annual or winter annuall plants. |
| Reference | Oenothera stricta Ledeb. ex Link |
| Note | Naturalized plants. (introduced in 1848-1854) |
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| May 2007 at roadside |
May 2007 at roadside |
May 2007 at roadside |
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| May 2007 at roadside |
