Populus nigra L. (Pioppo nero)
Jan Kops et al. - Flora Batava - 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".

Populus nigra L. (Pioppo nero)
Picture by Aldo De Bastiani

Populus nigra L. (Pioppo nero)
Picture by Franco Giordana

Populus nigra L. (Pioppo nero)
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. 1: 590.

Populus nigra L. (Pioppo nero)
Dipartimento di Scienze della Vita, Università di Trieste - Progetto Dryades - Picture by Andrea Moro - Comune di Ferrara, area di fronte alla Certosa., FE, Emilia Romagna, Italia, - Image licensed under a Creative Commons Attribution Non Commercial Share-Alike 3.0 License

Populus nigra L. (Pioppo nero)
Dipartimento di Scienze della Vita, Università di Trieste - Progetto Dryades - Picture by Andrea Moro - Vienna, centro cittadino, Hortus Botanicus Vindobonensis, Orto botanico dell'Università di Vienna. , Austria, - Image licensed under a Creative Commons Attribution Non Commercial Share-Alike 3.0 License

Populus nigra L. (Pioppo nero)
Picture modified from Bley, Franz - Botanisches Bilderbuch (1897/98) - 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.

Populus nigra L. (Pioppo nero)
Jan Kops et al. - Flora Batava - 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".

Populus nigra L. (Pioppo nero)
Photo by Leo Michels. Usage: Public Domain

Populus nigra L. (Pioppo nero)
Hippolyte Coste - Flore descriptive et illustrée de la France, de la Corse et des contrées limitrophes, 1901-1906 - This image is in public domain because its copyright has expired.