A Shirley Poppy-Showing Reproductive Organs
The petals of a flower are designed to attract insects. The essential organs are the pollen-bearing stamens and the pistil joining the ovule at the center of the flower. This picture shows the large number of stamens of the poppy, each with a terminal anther, bearing pollen, growing in a circle about the pistil with its curiously rounded end, called a stigma, designed to receive the pollen. The office of the insect is to transfer pollen from the stamens of one flower to the pistil of another.
This image is from: Luther Burbank: his methods and discoveries and their practical application. Volume 3 Chapter 3