Oenothera biennis L. (Enagra comune)
Hugo de Vries - Gruppenweise Artbildung unter spezieller Berücksichtung der Gattung Oenothera (1913) - Permission granted to use under GFDL by Kurt Stueber. Source: www.biolib.de - Permission is granted to copy, distribute and/or modify this image under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License.

Oenothera biennis L. (Enagra comune)
Steve Hurst - USDA-NRCS PLANTS Database - Not copyrighted image

Oenothera biennis L. (Enagra comune)
Hugo de Vries - Gruppenweise Artbildung unter spezieller Berücksichtung der Gattung Oenothera (1913) - Permission granted to use under GFDL by Kurt Stueber. Source: www.biolib.de - Permission is granted to copy, distribute and/or modify this image under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License.

Oenothera biennis L. (Enagra comune)
USDA-NRCS PLANTS Database / Britton, N.L., and A. Brown. 1913. An illustrated flora of the northern United States, Canada and the British Possessions. Vol. 2: 595.

Oenothera biennis L. (Enagra comune)
Hugo de Vries - Gruppenweise Artbildung unter spezieller Berücksichtung der Gattung Oenothera (1913) - Permission granted to use under GFDL by Kurt Stueber. Source: www.biolib.de - Permission is granted to copy, distribute and/or modify this image under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License.

Oenothera biennis L. (Enagra comune)
Dipartimento di Scienze della Vita, Università di Trieste - Progetto Dryades - Picture by Andrea Moro - Comune di Venezia, Isola del Lido, località Alberoni, dune nei pressi dello stabilimento balneare., TS, FVG, Italia, - Image licensed under a Creative Commons Attribution Non Commercial Share-Alike 3.0 License

Oenothera biennis L. (Enagra comune)
Photo by Leo Michels. Usage: Public Domain

Oenothera biennis L. (Enagra comune)
Hugo de Vries - Gruppenweise Artbildung unter spezieller Berücksichtung der Gattung Oenothera (1913) - Permission granted to use under GFDL by Kurt Stueber. Source: www.biolib.de - Permission is granted to copy, distribute and/or modify this image under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License.

Oenothera biennis L. (Enagra comune)
Flowers at Crater rd Kula, Maui - Credit: Forest and Kim Starr - Plants of Hawaii - Image licensed under a Creative Commons Attribution 3.0 License, permitting sharing and adaptation with attribution.

Oenothera biennis L. (Enagra comune)
Flowers at Crater rd Kula, Maui - Credit: Forest and Kim Starr - Plants of Hawaii - Image licensed under a Creative Commons Attribution 3.0 License, permitting sharing and adaptation with attribution.