Chris Mattison / Stigma and anthers of Cactus flower (Notocactus crassigibbus). Cultivated plant. Focus-stacked image.

Gabriel Rojo / Close up of Passionflower (Passiflora caerulea) La Pampa, Argentina.

Wild Wonders of Europe / Bartocha / Common peony (Paeonia officinalis) close up of stamens and stigma, Monti Sibillini National Park, Italy, May.

Wild Wonders of Europe / Lilja / Tulips (Tulipa bakeri) close-up of flowers, Omalos, Crete, Greece, April 2009

Wild Wonders of Europe / Zupanc / Fire lily (Lilium bulbiferrum) flower, Triglav National Park, Slovenia, June 2009

Wild Wonders of Europe / Shpilenok / Close-up inside Wild tulip (Tulipa schrenkii, ) Rostovsky Nature Reserve, Rostov Region, Russia, April 2009

Wild Wonders of Europe / Widstrand / Close-up of Poppy flower stamens and stigma, La Serena, Extremadura, Spain, April 2009

Wild Wonders of Europe / Schandy / Close-up of blue flower (Campanula stevenii) Mount Cheget, Caucasus, Russia, June 2008

Konrad Wothe / Grass of Parnassus (Parnassia palustris) flower detail with dewdrops, Bavaria, Germany, Europe. September.

Nigel Cattlin / Lenten rose (Helleborus hybridus) red flower of an ornamental garden plant showing typical structure of flowering Ranunculaceae, Berkshire, UK, February.

Robert Thompson / Woodland crocus (Crocus tommasinianus) close-up of anthers and stigma , Banbridge, County Down, Northern Ireland.

Robert Thompson / Woodland crocus (Crocus tommasinianus) close-up of anthers and stigma , Banbridge, County Down, Northern Ireland.

Robert Thompson / Tulip (Tuplia species) close up of stigma, Banbridge, County Down, Northern Ireland.

Robert Thompson / Tulip (Tuplia species) close up stigma seen through petals, Banbridge, County Down, Northern Ireland.

Robert Thompson / Tulip (Tuplia species) close up of stigma, Banbridge, County Down, Northern Ireland.

Robert Thompson / Tulip (Tuplia species) Banbridge, County Down, Northern Ireland.

Robert Thompson / Tulip (Tuplia species) close up of anthers, Banbridge, County Down, Northern Ireland.

Robert Thompson / Tulip (Tuplia species) close up of anthers, Banbridge, County Down, Northern Ireland.

Robert Thompson / Tulip (Tuplia species) close up of stigma and anthers, Banbridge, County Down, Northern Ireland.

Robert Thompson / Tulip (Tuplia species) close up of stigma and anthers, Banbridge, County Down, Northern Ireland.

Robert Thompson / Tulip (Tuplia species) close up of stigma and anthers, Banbridge, County Down, Northern Ireland.

Robert Thompson / Tulip (Tuplia species) close up of stigma, Banbridge, County Down, Northern Ireland.

Robert Thompson / Herb-robert (Geranium robertianum) close up of anthers and stigma, Clare Glen, Northern Ireland.

Dave Watts / Long purpleflag (Patersonia occidentalis). Tasmania, Australia. December.

Nick Upton / Herb Paris (Paris quadrifolia), close up. Wiltshire, England, UK. May.

Robert Thompson / Tulip (Tulipa sp) close up of stigma and anthers, County Down, Ireland, March

Robert Thompson / Tulip (Tulipa sp) close up of stigma and anthers County Down, Ireland, February

Paul Harcourt Davies / Turk's cap lily (Lilium martagon). Dolomites, Italy. July.

Paul Harcourt Davies / One-flowered wintergreen (Moneses uniflora). Fassa Valley, Dolomites, Trentino, Italy. June.

Phil Savoie / Dandelion (Taraxacum officinale) stigma open to receive pollen for fertilization, Monmouthshire, Wales, UK, July.

Phil Savoie / Chicory (Cichorium intybus) composite flower, close up of stigmas with pollen, Monmouthshire, Wales, UK, July.

Phil Savoie / Chicory (Cichorium intybus) composite flower, close up of stigmas with pollen, Monmouthshire, Wales, UK, July.

Linda Pitkin / Blue passionflower (Passiflora caerulea) non native, garden escape, along the River Thames Path at Kingston, England, UK. July.

Steve Nicholls / Wild daffodil (Narcissus pseudonarcissus) stamens and stigma

Nigel Cattlin / A section of a Tulip (Tulipa) flower showing its structure, red orange sepals, anthers, stamens, style, stigma and ovary

Nigel Cattlin / Blossom on a Pear tree (Pyrus) on a fine spring day, the green leaves are just developing, Berkshire, England, UK, April

Nigel Cattlin / Blossom on a Pear tree (Pyrus) on a fine spring day, the green leaves are just developing, Berkshire, England, UK, April

Nigel Cattlin / Blossom on a Pear tree (Pyrus) on a fine spring day, the green leaves are just developing, Berkshire, England, UK, April

Nigel Cattlin / Blossom on a Pear tree (Pyrus) on a fine spring day, the green leaves are just developing, Berkshire, England, UK, April

Nigel Cattlin / White flowers of a Victoria plum (Prunus domestica) with anthers, stamens, style and stigma, with leaves unfolding in early spring, Berkshire, England, UK, April.

Nigel Cattlin / Blue flower of garden ornamental Anemone coronaria with petals, sepals, calyx, central anthers, stamens, stigma and style

Heather Angel / Black coral vine (Kennedia nigricans) flowers, pollinated by honeyeaters (flowers triggered by honeyeater, releasing the stamens, style and stigma), Western Australia Sequence 2 of 2

Heather Angel / Stigmas in female flowers of single Wax begonia (Begonia semperflorens group) mimic pollen laden stamens produced by male flowers but offer no reward to pollinators, which land on them and pollinate t...

Nigel Cattlin / Cape pondweed (Aponogeton distachyos) on garden pond, Fly on petal. Berkshire, England, UK. May.

Nigel Cattlin / Tulip (Tulipa sp) flower cross section with mature anthers and style, close up. Berkshire, England, UK. April.

Nigel Cattlin / Tulip (Tulipa sp) flower cross section with immature anthers and style, close up. Berkshire, England, UK. April.