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

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.

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