Cape pondweed or water hawthorn (Aponogeton distachyus): flowering stems and leaves. Coloured zincograph by L. Constans, c. 1851, after himself. | Wellcome Collection
Aponogeton - Wikipedia
Aponogeton distachyos (Water Hawthorn)
Water hawthorn (Aponogeton Distachyos) - Wetland Plants
Aponogeton distachyos - Vanille d'eau – Une plante aquatique parfumée
Cape pondweed | Japanese Knotweed Control | Eradication