Occurrence: Grows in water.
Three species of Potamogeton have been recorded locally
Floating Pondweed (P. tricarinatus). Some leaves floating. Floating leaves oval, on long stalks.
Curly Pondweed (P. crispus). All leaves submerged. Leaves finely toothed, wavy (i.e. not flat), leaves without very fine veins bewteen the main veins.
Blunt Pondweed (P. ochreatus). All leaves submerged. Leaves not toothed, not wavy, rounded at the ends, with fine veins between the main leaf veins.