Lemna trisulca L. (Lenticchia d'acqua spatolata)
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: 447.

Lemna trisulca L. (Lenticchia d'acqua spatolata)
Picture modified from Richard Wettstein - Handbuch der Systematischen Botanik (1924) - 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'.

Lemna trisulca L. (Lenticchia d'acqua spatolata)
Dipartimento di Scienze della Vita, Università di Trieste - Progetto Dryades - Picture by Andrea Moro - Image licensed under a Creative Commons Attribution Non Commercial Share-Alike 3.0 License

Lemna trisulca L. (Lenticchia d'acqua spatolata)
Walter Hood Fitch - Illustrations of the British Flora (1924) - 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".

Lemna trisulca L. (Lenticchia d'acqua spatolata)
Dipartimento di Scienze della Vita, Università di Trieste - Progetto Dryades - Picture by Andrea Moro - Comune di Padova, Orto Botanico. , PD, Veneto, Italia, - Image licensed under a Creative Commons Attribution Non Commercial Share-Alike 3.0 License

Lemna trisulca L. (Lenticchia d'acqua spatolata)
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.

Lemna trisulca L. (Lenticchia d'acqua spatolata)
Picture modified from Graebner, Paul - Taschenbuch zum Pflanzenbestimmen (1918) - 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.