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  • Three types of pondweed (Potamogeton species). Coloured engraving by J. Pass, c. 1825.
  • Fennel-leaved pondweed (Potamogeton pectinatus): flowering stem, root and floral segments. Coloured engraving after J. Sowerby, 1795.
  • Seven aquatic flowering plants, all types of pondweed (Potamogeton species). Chromolithograph by W. Dickes & co., c. 1855.
  • Four flowering plants, including cuckoo-pint, sweet flag and two pondweeds. Chromolithograph by W. Dickes & co., c. 1855.
  • Fennel-leaved pondweed (Potamogeton pectinatus) with an associated beetle and its anatomical segments. Coloured etching, c. 1831.