Water lily, Nymphaea cultivar. Single white flower with pink tipped petals and yellow centre.

Water lily, Nymphaea cultivar. White flower with yellow centre raised on stem above water and lily pads with another, part seen in immediate foreground.

Water Snowflake, two white flowers with yellow centres and feathery edges to the petals. Leaves of Giant Water Sensitive Plant, Aeschynomene fluitans part seen behind.

Water Snowflake, two white flowers with yellow centres and feathery edges to the petals. Leaves of Giant Water Sensitive Plant, Aeschynomene fluitans behind.

Gerbera cultivar. Four individual flower stems in shades of yellow and orange arranged in a row and photographed on a lightbox.

Yellow Oleander, Thevetia peruviana. Single open flower and buds growing in Phrao, Chiang Mai, Thailand.

Slipper orchid, Paphiopedilum Concolor with pale yellow, spotted flower at the 2011Orchid Festival in Chiang Mai, Thailand.

Spurge, Euphorbia characias wulfenii. Close, cropped large rounded head of small greenish yellow flowers held within cupped bracts.

Spurge, Euphorbia characias wulfenii. Shrub with clustered leaves and large rounded head of small greenish yellow flowers held within cupped bracts.

Cutleaf coneflower, Rudbeckia laciniata Herbstsonne. Yellow flower with green central cone.

Cutleaf coneflower, Rudbeckia laciniata Herbstsonne. Bumble bee on green central cone of yellow flower.

Inula. Bumble bee on yellow flower of Inula Hookeri. England, West Sussex, Chichester.