Feverfew, Tanacetum parthenium.

Poppy, Papaver commutatum 'Ladybird', black and white flower against a black background.

Poppy, Papaver commutatum 'Ladybird', black and white flower shot from behind.

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.

Yarrow, Achillea filipendulina 'Gold Plate', multiple stems backlit against a clear blue sky.

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

Opium poppy, Papaver somniferum 'Danish Flag', red and white coloured flower showing fringed petals and stamens.

Gerbera jamesonii, black and white flower viewed from underneath against a solid black background.

Opium poppy, Papaver somniferum 'Danish Flag', red and white coloured flower showing fringed petals and stamens.