The Violet's Wonderful Advertisement
With both wondrous color and charming scent, some violets advertise to the insects which, because of the flower's preference for moist shady places, rarely come. Wild, in the woods, are to be found violets which bear only colorless flowers as shown in the preceding print, as well as some which bear both kinds of flowers, and still others which, as if having succeeded in attracting the insects, bear only the delicate blossoms shown here.
This image is from: Luther Burbank: his methods and discoveries and their practical application. Volume 1 Chapter 4