Floristique du genre Oenothera L., section Oenothera, sous-section Euoenothera (Onagraceae) en France
http://www.tandfonline.com/doi/pdf/10.1080/12538078.1994.10515234?needAccess=true
Il genere Oenothera L. subsect. Oenothera, in Italia (Onagraceae)
bot.biologia.unipi.it/chiavi/Oenothera_Soldano.pdf
Oenothera - Flora Nordica
http://www.floranordica.org/Review/-Review_public/accounts/Oenothera.html
Systematics of Oenothera Sect. Oenothera Subsect. Oenothera (Onagraceae)
https://repository.si.edu/handle/10088/9721
The genus Oenothera (Onagraceae) in Belgium
http://www.br.fgov.be/DUMORTIERA/DUM_106/Dum_106_12-42_Rostanski%20and%20Verloove_Oenothera.pdf
The species of Oenothera L. in Britain
http://archive.bsbi.org.uk/Wats14p1.pdf
Oenothera indecora (Onagraceae) a neophyte new to Italy
http://www.herbmedit.org/flora/23-087.pdf
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