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.

Stephen Dalton / Close up of the inside of a foxglove (Digitalis purpurea) showing the pistil and stamen, UK.

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

Paul Harcourt Davies,Paul Harcourt Davies / Martagon lily (Lilium martagonium) flower, Terminillo, Rieti, Lazio, Italy, July

Rolf Nussbaumer / Texan spider lily (Hymenocallis liriosme) stamens close up, Texas Coast, USA

Edwin Giesbers / Yellow horned poppy (Glaucium flavum) close up of pistil and stamens, Menorca, Balearic Islands, Spain

Wild Wonders of Europe / Lilja / Tulips (Tulipa bakeri) close-up of flowers, Omalos, Crete, Greece, April 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 / Anemone sp flower, close up of stamens, Mount Cheget, Caucasus, Russia, June 2008

Ross Hoddinott / Close-up of Wood anemone (Anemone nemorosa) flower, Devon, UK. April