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

Willem Kolvoort / Longleaf Pondweed (Potamogeton nodosus) River Ijesell, Holland. July.

Wild Wonders of Europe / Lundgren / Current pulling weeds possibly Potamogeton sp, along riverbed, Danube Delta, Romania, June.

Wild Wonders of Europe / Lundgren / Aquatic plant, possibly Potamogeton sp, in river current, Danube Delta, Romania, June.

Adrian Davies / Leaves of Bog Pondweed {Potamageton polygonifolius} New Bridge Marsh, Dartmoor, Devon, England

Niall Benvie / Pondweed {Potamogeton sp} Tansley bog, Beinn Eighe NNR, W Ross, Scotland

Willem Kolvoort / Broad leaved pondweed (Potamogeton sp) underwater in brook, Holland

Willem Kolvoort / Looking up at Shining pondweed (Potamogeton lucens) from bottom of sand winning pit, Holland

Willem Kolvoort / Pondweed (Potamogeton sp) covered with colonies of Bellanimacules (Vorticella), in sand-winning pit, Holland

Heidi & Hans-Juergen Koch / Giant Fire-bellied Toad (Bombina maxima) emerging from pond weed, native to China

Franco Banfi / Northern pike (Esox lucius) amongst Shining pondweed (Potamogeton lucens), Sion, Valais canton, southwestern Switzerland, Europe