Trapa natans
Jacob Sturm, Johann Georg Sturm - Deutschlands Flora in Abbildungen (1796). - This image is in the public domain because its copyright has expired. - Foto visualizzata 1008 volte

Trapa natans
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. - Foto visualizzata 877 volte

Trapa natans
Credit: Photo by Patrizia Ferrari - Foto visualizzata 862 volte

Trapa natans
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: 612. - Foto visualizzata 878 volte