The Orchid Awaiting an Insect
Flowers are usually not only designed by their general shape to attract insects, but their nectar store is often surrounded by a target of some kind-sometimes of color only, and sometimes as in the case of the orchid, a folded leaf which guides the insect in. Almost all flowers, in this way, have centers which are white, or more brilliant than, or different from the rest of their color as it to lead the insect to its work with the least possible delay. The orchid's pollen map be seen in this photograph print directly in the center of the flower.
This image is from: Luther Burbank: his methods and discoveries and their practical application. Volume 1 Chapter 3