Isoetes duriei
Credit: Photo by Giuseppe Trombetti - Foto visualizzata 23 volte

Isoetes echinospora
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 12 volte

Isoetes histrix
Credit: Photo by Giuseppe Trombetti - Foto visualizzata 20 volte

Isoetes lacustris
USDA-NRCS PLANTS Database / USDA NRCS. Wetland flora: Field office illustrated guide to plant species. USDA Natural Resources Conservation Service. - Not copyrighted image - Foto visualizzata 12 volte