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.

Nick Upton / Hoverfly (Myathropa florea), using proboscis to feed on pollen from anthers of Ivy flowers (Hedera helix). Wiltshire garden, UK, September

Albert Lleal / Albany Bottlebrush (Callistemon speciosus) SEM close-up view of the pollen covered anther at 70x magnification

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

Nigel Cattlin / Crested dog's-tail grass (Cynosurus cristatus) amongst other grasses. Berkshire, England, UK. June.

Nigel Cattlin / Quaking grass (Briza media) spikelets flowering within panicle, close up. Berkshire, England, UK. June.

Nigel Cattlin / Quaking grass (Briza media) spikelets flowering within panicle, close up. Berkshire, England, UK. June.

Nigel Cattlin / Meadow fescue grass (Schedonorus pratensis) spikelets flowering in panicle, close up. Berkshire, England, UK. June.

Nigel Cattlin / Cocksfoot grass Dactylis glomerata) panicle, anthers releasing pollen. Berkshire, England, UK. June.