Cape pondweed or water hawthorn (Aponogeton distachyus): flowering stems and leaves. Coloured zincograph by L. Constans, c.… https://www.rawpixel.com/image/13951971/image-flower-plant-artFree Image from public domain licenseCape pondweed or water hawthorn (Aponogeton distachyus): flowering and fruiting stems. Coloured engraving by F. Sansom, c.… https://www.rawpixel.com/image/13952801/image-flower-plant-medicineFree Image from public domain license