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