Terry Whittaker / Water vole (Arvicola amphibius) feeding on Yellow flag iris (Iris pseudacorus) seed pods, Kent, England, UK. October.

Sven Zacek / Yellow Flag Iris (Iris pseudacorus) flowering in birch forest. Estonia, Europe, June.

Russell Cooper / Banded Demoiselle (Calopteryx splendens) male at rest on Yellow Flag Iris flower bud (Iris pseudacorus) Morden, South London. England, UK.

Stephen Dalton / Earwig {Labidura riparia} about to drop from yellow Iris flower, UK

Stephen Dalton / Close up of petal of Iris {Iris sp}

Wild Wonders of Europe / Shpilenok / Four Dwarf irises (Iris pumila) in flower, Rostovsky Nature Reserve Rostov Region, Russia, April 2009

Wild Wonders of Europe / Wothe / Male Roe deer (Capreolus capreolus) in flower meadow with Siberian irises (Iris sibirica) Eastern Slovakia, Europe, May 2009 WWE BOOK. WWE OUTDOOR EXHIBITION

Wild Wonders of Europe / Wothe / Male Roe deer (Capreolus capreolus) in flower meadow with Siberian irises (Iris sibirica) Eastern Slovakia, Europe, May 2009

Wild Wonders of Europe / Allofs / Flowering Yellow iris (Iris pseudacorus) Camargue, France, May 2009

Wild Wonders of Europe / Allofs / White Camargue horse grazing amongst Yellow flag irises, Camargue, France, April 2009

Mark Yates / Southern hawker dragonfly {Aeshna cyanea} on yellow iris. England, UK

Linda Pitkin / Yellow iris (Iris pseudacorus). River Thames Path, Hampton Court, Richmond Upon Thames, England, UK. May.

Ross Hoddinott / Male broad-bodied chaser (Libellula depressa) dragonfly resting on yellow flag iris flower bud (Iris pseudacorus), Broxwater, Cornwall, UK. May.

Ross Hoddinott / Four-spotted chaser dragionfly (Libellula quadrimaculata) dragonfly resting on Yellow Flag Iris flower bud (Iris pseudacorus), early morning, Broxwater, Cornwall, UK. May .

Will Watson / Yellow Iris (Iris pseudacorus), natural woodland pond, Shatsky National Natural Park, Volyn Oblast, Ukraine, May.

Heather Angel / Solitary bee (Apoidea) feeding on Crocus (Crocus korolkowii), covered in pollen. Ansob Pass, Tajikistan. April.

Heather Angel / Water tulip (Cypella aquatilis) from above, in garden pond. Native to Brazil.

Heather Angel / Afghanistan Juno iris (Iris cycloglossa) with yellow nectar guides. In cultivation, Kew Gardens, London, England, UK. Native to Afghanistan.

Rod Williams / Capsid bug (Closterotomus trivialis) on yellow iris Beverley Court Gardens, Lewisham, London, England, UK. May.

Edwin Giesbers / Wildflower meadow with Field gladiolus (Gladiolus italicus), Crown daisy (Glebionis coronaria) and Common poppy (Papaver rhoeas). Cyprus. April 2017.

Dave Bevan / Female Four-spotted chaser (Libellula quadrimaculata) landing and taking off from a Yellow iris (Iris pseudacorus) flower, Norfolk, England, UK, June.

Juan Carlos Munoz / Yellow flag iris (Iris pseudacorus), Liendo, Cantabria, Spain. May.

Chris Mattison / Yellow Iris (Iris pseudacorus) open seedpod with seeds. Whitelye Common, Monmouthshire, Wales, UK, October

Nick Upton / Teresa Sinclair watching a Short-haired bumblebee queen (Bombus subterraneus) nectaring on Yellow flag iris flowers (Iris pseudacorus) after releasing it during a UK reintroduction project run by the...

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...

MYN / Dirk Funhoff / Yellow flag iris (Iris pseudacorus) showing reproductive parts, Büchelberg, Germany. Meetyourneighbours.net project.

MYN / Dirk Funhoff / Yellow flag iris (Iris pseudacorus), Büchelberg, Germany. Meetyourneighbours.net project.

MYN / Dirk Funhoff / Yellow flag iris (Iris pseudacorus), Büchelberg, Pfalz, Germany. May. Meetyourneighbours.net project

MYN / Dirk Funhoff / Yellow flag iris (Iris pseudacorus), Büchelberg, Pfalz, Germany. May. Meetyourneighbours.net project

Jean E. Roche / Woodland tulip (Tulipa sylvestris) and Crimean iris (Iris chamaeiris) flowers and Irises, Alpilles, France. April.

David Kjaer / Southern hawker (Aeshna cyanea) emerging from larva/nymph case, Wiltshire, UK

Terry Whittaker / Water vole (Arvicola amphibius) feeding on Yellow flag iris (Iris pseudacorus) seed pods, Kent, England, UK. October.

Terry Whittaker / Water vole (Arvicola amphibius) feeding on seed pods of Flag iris (Iris pseudacorus ), Kent, England, UK. October.

Stephen Dalton / A small farm pond in healthy condition (no pollution or rubbish) with a variety of aquatic plants including Yellow flag Iris, Butterbur, Greater pondweed and Bogbean, Sussex, UK

Ann & Steve Toon / Yellow Cape tulip (Moraea collina) De Hoop Nature Reserve, Western Cape, South Africa

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

Olga Kamenskaya / Iris flower (Iris potaninii) Olkhon island, Lake Baikal, Russia, May.

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.

Adrian Davies / Stinking iris flower (Iris foetidissima), Surrey, England, May.

Paul Harcourt Davies / Eyed Mantis (Iris oratoria) female, Pescia Romana, near Orbetello, Lazio, Italy, October.

Martin Gabriel / Dutch yellow crocus (Crocus flavus flavus) occurs in Eastern Europe and Turkey, flowering in a private garden in Bavaria, Germany.

Martin Gabriel / Crocus flavus flavus, occurs in Eastern Europe and Turkey, flowering in a private garden in Bavaria, Germany

Nick Upton / Yellow flag irises (Iris pseudacorus) flowering in a ditch in a damp lowland meadow, Wiltshire, UK, June.

Nick Upton / Yellow flag irises (Iris pseudacorus) flowering in a ditch in a damp lowland meadow with a Snout / Duck-billed Hoverfly (Rhingia campestris) resting on a petal, Wiltshire, UK, June.

Fabrice Cahez / Yellow flag iris (Iris pseudacorus) flower, Vosges, France, June.

Tony Phelps / Wiry Clockflower (Moraea gawleri) deHoop Nature Reserve. Western Cape, South Africa.