B&S Draker / Pipevine Swallowtail Butterfly (Battus philenor) pair mating. Sinton, Corpus Christi, Coastal Bend, Texas, USA, June.

Andrew Parkinson / Puffin (Fratercula arctica) head portrait, and single flower of Thrift (Ameria maritima) Shetland Islands, Scotland, UK, July (non-ex)

Ross Hoddinott / Wood anemone (Anemone nemorosa) single flower, Halsdon woodland, Devon, England, UK. April 2010.

Rolf Nussbaumer / Single White Prickly Poppy (Argemone albiflora) flower, in wildflower meadow, Fennessey Ranch, Refugio, Coastal Bend, Texas Coast, USA

Rolf Nussbaumer / Wine-Cup (Callirhoe involucrata) in flower, Fennessey Ranch, Refugio, Corpus Christi, Coastal Bend, Texas Coast, USA

Aflo / N-17405 Sunflower {Helianthus annuus}

Stephen Dalton / Dandelion {Taraxacum officinale} single seed left on flower head, UK

Jose B. Ruiz / Almond trees (Prunus dulcis / Amygdalus communis) in blossom, close up of single flower, Spain

Nick Upton / Head on view of a Dark green fritillary butterfly (Argynnis aglaja) feeding on Greater knapweed flower (Centaurea scabiosa) with long proboscis, chalk grassland meadow, Wiltshire, UK, July

Nick Upton / Mint moth (Pyrausta aurata) feeding on Wild marjoram flower (Origanum vulgare), chalk grassland meadow, Wiltshire, UK, July

Nick Upton / Stemless / Dwarf carline thistle / Silver thistle (Carlina acaulis) with single large flower bud at 1800m in the Julian Alps, Triglav National Park, Slovenia, July

Nick Upton / Stemless / Dwarf carline thistle / Silver thistle (Carlina acaulis) with single large flower bud at 1800m in the Julian Alps, Triglav National Park, Slovenia, July

Laurie Campbell / Harebell (Campanula rotundifolia) single flower weighed down with raindrops, Inverness-shire, Scotland, August

Hanne & Jens Eriksen / Atlantic puffin (Fratercula arctica) portrait, sitting in grass near single Thrift flower, Iceland, June

Nick Upton / Single male of an overwintering species of Greenbottle (Eudasyphora cyanella) sunbasking in early spring sunshine on Forsythia flower. Wiltshire garden, UK, March.

Colin Varndell / Viper's buglos (Echium vulgare) single spike in flower. Porland, Dorset, UK, June

Paul Harcourt Davies / Turk's cap / Martagon Lily (Lilium martagon) close up of single flower, alpine mountain meadow, Apennine monutains, Italy, Europe.

Paul Harcourt Davies / Red Helleborine (Cephalanthera rubra) close-up of single flower, Monteccucco, Italy, Europe. Protected species.

Ross Hoddinott / Wood anemone (Anemone nemorosa) single flower rear view, Halsdon woodland, Devon, England, UK. April 2010.

Ross Hoddinott / Wood anemone (Anemone nemorosa) single flower, Halsdon woodland, Devon, England, UK. April 2010.

Jouan & Rius / Grass tree (Xanthorrhoea) with single flower spike, silhouetted against the sky, Lesueur National Park, Western Australia. August 2009

Jouan & Rius / Grass tree (Xanthorrhoea) with single flower spike, silhouetted against the sky, Lesueur National Park, Western Australia. August 2009

Jouan & Rius / Grass tree (Xanthorrhoea) with single flower spike, Lesueur National Park, Western Australia. August 2009

Jouan & Rius / Grass tree (Xanthorrhoea) with single flower spike, Lesueur National Park, Western Australia. August 2009

Aflo / N-17504 Sunflower close up {Helianthus annuus}

Aflo / N-17401 Sunflower {Helianthus annuus}

Aflo / N-23401 Red rose {Rosa sp}

Aflo / N-17501 Sunflower {Helianthus annuus}

Aflo / N-17409 Sunflower {Helianthus annuus}

Aflo / N-17408 Sunflower {Helianthus annuus}

Andy Sands / Figwort Weevil (Cionus scrophulariae) adult on single flower of Figwort {Scrophularia sp}, UK, Captive

Andy Sands / Figwort Weevil (Cionus scrophulariae) adult on single flower of Figwort {Scrophularia sp}, UK, Captive

Paul Hobson / Burnt tip orchid (Neotinea ustulata) single flower head with blooms fading, Peak District, Derbyshire, UK

Paul Hobson / Burnt tip orchid (Neotinea ustulata) single flower head, Peak District, Derbyshire, UK

Russell Cooper / Fly orchid {Ophrys insectifera} with single flower, UK

WILLIAM OSBORN / Self heal {Prunella vulgaris} single flower portrait, Gloucestershire, UK

Philippe Clement / Single flower knapweed {Centaurea uniflora} Gran Paradiso NP, Alps, Italy

Adrian Davies / Meadow cranesbill flower {Geranium pratense} Surrey, May, UK.

Michael & Patricia Fogden / Orchid (Sobralia sp) portrait, single flower with dew drops, Costa Rica

Jose B. Ruiz / Bird of paradise flower {Strelizia sp} Tenerife, Canary Is

Ben Osborne / Bluebell, single plant in flower {Hyacinthoides non-scripta} Isle of Rhum, Scotland, UK

Paul D Stewart / Illustration of Rafflesia arnoldi, hand tinted copperplate engraving from 'Bilderbuch fur Kinder' BD XI, No 14, plate CLXXIII. c1820 around the time of the flower's first description. The largest sing...

Pete Oxford / Single water lily flower {Nymphaea nouchali caerulea} Okavango Delta Botswana

Ben Osborne / Bluebell single plant in flower {ymion nonscriptus} Scotland UK