Nick Upton / Short-haired bumblebee queen (Bombus subterraneus) collected in Sweden nectaring on a Yellow flag iris flower (Iris pseudacorus) with its long tongue after release during a UK reintroduction project r...

Ross Hoddinott / Newly emerged Emperor dragonfly (Anax imperator) resting on Yellow iris (Iris pseudacorus) Broxwater, Cornwall, UK. June 2015.

Pascal Tordeux / Yellow flag iris (Iris pseudacorus) in pond with reflections of clouds, medicinal plant. France, May.

Pascal Tordeux / Yellow flag iris (Iris pseudacorus) not yet in flower, at pond edge, medicinal plant. France, April.

Chris Mattison / Flag iris (Iris pseudacorus) on black background. Focus stacked image.

Heike Odermatt / Bogbean (Menyanthes trifoliata) and Yellow Iris (Iris pseudacorus) flowering at edge of coastal lagoon, De Bollekammer Nature Reserve, Texel, Netherlands

Ernie Janes / Yellow Flag Iris (Iris psueudacorus) and Banded Snail (Cepaea nemoralis) North Norfolk, UK, June

Philippe Clement / Yellow Iris / Yellow Flag (Iris pseudacorus) in flower. Belgium, May.

Philippe Clement / Yellow Iris / Yellow Flag (Iris pseudacorus) in flower. Belgium, May.

Adrian Davies / Yellow Iris (Iris pseudacorus), unopened buds. UK, May.

MYN / Niall Benvie / Yellow iris (Iris pseudacorus) flower on white background, Scotland, UK, June meetyourneighbours.net project

MYN / Niall Benvie / Yellow iris (Iris pseudacorus) flower on white background, Scotland, UK, June meetyourneighbours.net project