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.

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

Tim Fitzharris / Blanketflower (Gaillardia sp) close-up showing pollen covered anthers and dense pistils in center, North America

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.

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

Nigel Cattlin / Daffodil (Narcissus cyclamineus 'Jetfire') cross section of flower trumpet with stamens, style and ovules inside ovary. March.

Nigel Cattlin / Daffodil (Narcissus cyclamineus 'Jetfire') cross section of flower trumpet with stamens, style and ovules inside ovary. March.