Siberian iris, Iris sibirica 'Sparkling rose', purple flower against lilac background.

Siberian iris, Iris sibirica 'Sparkling rose', purple flower against dappled background.

Siberian iris, Iris sibirica 'Sparkling rose', purple flower against dappled background.

Siberian iris, Iris sibirica 'Sparkling rose', purple flower against pale lilac coloured background.

Iceland poppy, Papaver nudicaule, front view showing stigma and stamens.

Helen's flower, Sneezeweed, Helenium, viewed side on showing the domed central mass of stamens.

Helen's flower, Sneezeweed, Helenium, viewed side on showing the domed central mass of stamens.

Helen's flower, Sneezeweed, Helenium, viewed side on showing the domed central mass of stamens.

Helen's flower, Sneezeweed, Helenium, viewed side on showing the domed central mass of stamens.

Avens, Geum 'Tangerine dream', viewed from underneath showing the sepals and stamen.

Dahlia, red flower shot against similar colour backgound.

Dahlia, red flower shot against similar colour backgound.