Historische Abbildung von Potamogeton acutifolius (Spitzblaettriges Laichkraut - Sharp-leaved Pondweed). Das Bild zeigt Blatt, Bluete, Frucht und Same. ---- Historical Drawing of Potamogeton acutifolius (Spitzblaettriges Laichkraut - Sharp-leaved Pondweed).The image is showing leaf, flower, fruit and seed.