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.

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

Colin Varndell / Female Common yellow dung fly (Scathophaga stercoraria) resting on a Yellow flag iris (Iris pseudacorus) flower, Dorset, England, UK, June

David Pattyn / Yellow flag iris (Iris pseudacorus) in a lake, Texel Island, Wadden Sea, The Netherlands June

Will Watson / Watercress (Rorippa nasturtium-aquaticum) and Yellow flag iris (Iris pseudacorus) growing in spring-fed pond, with backdrop of ancient woodland, Herefordshire, England, June 2008.

David Woodfall / Yellow flag iris (Iris peudacorus ) and Greater water dock ( Rumex hydropathum ) in overgrown Alder wetland, Oxwich National Nature reserve, Gower, Wales, UK, June

MYN / Denis Palanque / Orb web spider (Meta segmentata) on Yellow flag iris (Iris pseudacorus) wetlands, Optevoz, Isere, Rhones-Alpes, France, April. meetyourneighbours.net project

MYN / Denis Palanque / Yellow flag iris (Iris pseudacorus) wetlands, Optevoz, Isere, Rhones-Alpes, France, April. meetyourneighbours.net project

Adrian Davies / Yellow Iris (Iris pseudacorus) UK

Alan Williams / Yellow flag iris (Iris pseudacorus) bed growing on ruined croft, South Uist, Outer Hebrides, Scotland, UK, May 2011

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

Nick Upton / Yellow flag irises (Iris pseudacorus) growing alongside a drainage channel. The Camargue, France, May.

Donald M. Jones / Yellow-headed Blackbird (Xanthocephalus xanthocephalus) male calling from blooming Yellow Iris (Iris pseudacorus), western Montana

Wild Wonders of Europe / della Ferrera / Yellow flag iris (Iris pseudacorus) in flower and Yellow water lily (Nuphar lutea) leaves on water, Hutovo Blato Nature Park, Bosnia and Herzegovina, May 2009

Michel Poinsignon / Yellow iris {Iris pseudacorus} and Cotton grass {Eriophorum sp} Lorraine, France

Wild Wonders of Europe / della Ferrera / Yellow flag iris (Iris pseudacorus) flowers and Yellow water lily (Nuphar lutea) leaves on water, with White willow (Salix alba) trees along a channel in the Hutovo Blato Nature Park, Bosnia and Herze...

Bernard Castelein / Cow wading in the water and Yellow Flag irises (Iris pseudacorus) flowering around dune lake in the Grote Vlake, Texel, The Netherlands

Bernard Castelein / Yellow Flag irises (Iris pseudacorus) flowering around dune lake in the Grote Vlake, Texel, The Netherlands

Bernard Castelein / Eurasian / White Spoonbill (Platalea leucorodia) in wetlands with Yellow Flag iris (Iris pseudacorus), Texel, the Netherlands

Juan Carlos Munoz / Yellow iris (Iris pseudacorus) flowering in wetlands, Andalucia, Spain, March

Juan Carlos Munoz / Yellow iris (Iris pseudacorus) flowering in wetlands, Andalucia, Spain, March

Juan Carlos Munoz / Yellow iris (Iris pseudacorus) flowering in wetlands, Andalucia, Spain, March

Martin Gabriel / Stands of Yellow iris (Iris pseudacorus) along the White Laber river, near Dietfurt, Bavaria, Germany, May 2007.

Mark Yates / Southern hawker dragonfly (Aeshna cyanea) resting on yellow iris (Iris pseudacorus) UK

Bernard Castelein / Dew-covered Yellow iris {Iris pseudacorus} buds, Belgium

David Pike / Yellow Flag {Iris pseudacorus} River Nene, Water Newton, Cambridgeshire, UK

MYN / Niall Benvie / Yellow iris {Iris pseudacorus} UK, June meetyourneighbours.net project

Willem Kolvoort / Underwater view of Yellow iris plant (Iris pseudacorus) showing tuber, Lake Naarden, Holland

Willem Kolvoort / Split level view of Yellow iris (Iris pseudacorus) growing by side of sand winning pit, Holland

GEORGETTE DOUWMA / Yellow iris {Iris pseudacorus} UK.

Niall Benvie / Yellow iris {Iris pseudacorus} flower, Estonia.

Philippe Clement / Yellow / Flag iris {Iris pseudacorus} Belgium

Bernard Castelein / Yellow iris {Iris pseudacorus} Belgium

Adrian Davies / Yellow iris, Iris pseudacorus, South England, UK, Europe.

Adrian Davies / Yellow iris seed heads (Iris pseudacorus) South England, UK, Europe

Bernard Castelein / Yellow iris flower and morning dew {Iris pseudacorus} Belgium, Europe

Bernard Castelein / Yellow iris flower about to unfurl {Iris pseudacorus} Belgium, Europe

Artur Tabor / Yellow / Flag iris {Iris pseudocorus} flowering in woodland. Poleski NP, Poland

Robert Thompson / Yellow iris (Iris pseudacorus) flowering beside lake, Hillsborough Park, County Down, Northern Ireland, UK