Chris Mattison / Broad-leaved pondweed (Potamogeton natans) growing among Sphagnum moss in a small pond in Woorgreens Nature Reserve, Gloucestershire, UK

Nick Upton / Broad-leaved pondweed (Potamogeton natans) flowering in a marshland pond, Devon, UK, June

Konrad Wothe / Broad-leaved Pondweed (Potamogeton natans), Dolomites, Italy

Alex Hyde / Broad-leaved pondweed (Potamogeton natans) growing in moorland pool, with raindrops beading on the hydrophobic surface of the leaves. Peak District National Park, Derbyshire, UK. December.

Nick Upton / Broad-leaved pondweed (Potamogeton natans) in heathland pond. Dorset, England, UK. June.

Nick Upton / Common European toad toadlet (Bufo bufo) sitting on a Broad-leaved pondweed (Potamogeton natans) leaf in a pond, Dorset, UK, June.

Nick Upton / Pondweed leafhopper (Erotettix cyane) nymph resting on a leaf of Broad-leaved pondweed (Potamogeton natans), its sole host plant in a heathland pond, Dorset, UK, June. This tiny insect is one of the U...

Nick Upton / Pondweed leafhopper (Erotettix cyane) adult resting on a Broad-leaved pondweed (Potamogeton natans) leaf, its sole food plant, in a heathland pond, Dorset, UK, June. This tiny insect is one of the UK'...

Willem Kolvoort / Common toad (Bufo bufo) tadpoles eating algae on Floating pondweed (Potamogeton natans). Netherlands. May.

Will Watson / Reed Beetle (Donacia veriscolorea) on Broad-leaved Pondweed (Potamogeton natans), Shatsky National Natural Park, Volyn Oblast, Ukraine, May.

Will Watson / Fen raft spider (Dolomedes plantarius) and Reed beetle (Donacia veriscolorea) on Broad-leaved Pondweed (Potamogeton natans), River, Volyn Oblast, Ukraine, May.