A Humming Bird Flower
The common nasturtium may be taken as a type of flower which advertises to the birds rather than to the bees. The honey is stored at the bottom of a long tube down which a bee could hardly stretch its proboscis. In many other ways, including the arrangement of the stamens and pistils, bird flowers show their adaptation to the partnership which their ancestors have built up.
This image is from: Luther Burbank: his methods and discoveries and their practical application. Volume 1 Chapter 3