This is an individual blossom of one of Mr. Burbank's best hybrid varieties of artichoke. The flowerhead has just passed the period when it would have been in ideal condition for eating, but has not yet fully presented its stamens and pistils. The improvement shown in some of these crossbred artichokes in Mr. Burbank's garden is remarkable; and they are still undergoing development.
This image is from: Luther Burbank: his methods and discoveries and their practical application. Volume 7 Chapter 6