Alex Hyde / Purple emperor butterfly (Apatura iris) male on English Oak (Quercus robur) leaf basking with wings open, UK, Captive.

Andy Sands / Orange tip butterfly (Anthocharis cardamines) on bluebell flower in English woodland, Hertfordshire, England, UK, April.

Matthew Maran / Bluebells (Hyacinthoides non-scripta) within an ancient semi-natural woodland, Woodbury, Devon, England, UK, May.

Matthew Maran / Bluebells (Hyacinthoides non-scripta) within an ancient semi-natural woodland, Woodbury, Devon, England, UK, May.

Juan Carlos Munoz / English iris (Iris xiphioides), Ordesa y Monte Perdido National Park, Aragon, Spain, July.

Juan Carlos Munoz / English iris (Iris xiphioides) growing in limestone pavement, Ordesa y Monte Perdido National Park, Aragon, Spain, July.

Juan Carlos Munoz / English iris (Iris xiphioides) growing in limestone pavement, Ordesa y Monte Perdido National Park, Aragon, Spain, July.

Steve Downer / Bluebells (Hyancinthoides non-scripta) in birch woodland, pan from right to left. Millison's Wood, Meriden, Birmingham UK.

Phil Savoie / Beech tree (Fagus sylvatica) and Common Bluebells (Hyacinthoides non-scripta), Monmouthshire, Wales, May.

Phil Savoie / Common Bluebells (Hyacinthoides non-scripta), Monmouthshire, Wales, May.

Phil Savoie / Beech tree (Fagus sylvatica) and Common Bluebells (Hyacinthoides non-scripta), Monmouthshire, Wales, May.

Mike Read / Spanish iris (Iris latifolia) beside the Lac des Gloriettes with the Breach of Tuquerouye, Pyrenees National Park, France. July.