As an organisms evolves, the things it needs as well as the things that need it often evolves with it. This is basically how coevolution works. In this case, the picture is of a flower that is low to the ground. This could be a result of whatever organism that transports its pollen being close to the ground. Also, in general, flowers are often shaped in a way that would allow only one type of pollinator to pollinate it so that there would be a higher chance of pollination on the right flowers. This is a result of coevolution.