Ultraviolet photograph of a pink Clematis flower on a garden cultivar of Clematis montana. Some flowers have hidden 'nectar guides' - markings only visible in ultraviolet, which bees and other insects can see. This clematis does not seem to have any UV markings, but the stamens appear much darker in UV than they do in visible light.
Clematis montana or the Anemone Clematis is an early flowering plant of the genus Clematis. It is a vigorous climbing plant and is used by gardeners to hide unsightly structures such as sheds and walls. It is native to mountain areas of Asia from Afghanistan to Taiwan.
Description adapted from Wikipedia: http://en.wikipedia.org/wiki/Clematis_montana