Common water-plantain  (Alisma plantago-aquatica)

Widespread throughout much of Britain, but rarer in the north of Scotland, Shetland, the Outer Hebrides and Orkney. Elsewhere, it is found in temperate Europe (2), and has become widely naturalised outside of its natural range (3).

This species is usually found growing at the edge of still or slow-flowing water, as well as in swamps and marshes (3).