Pollen Bearing Grape
The members of the grape family, like the strawberry, differ as to the character of their flowers. Some plants bear perfect blossoms, others are staminate with at most a rudimentary ovary. The plant thus occupies an intermediate position between those plants that all bear perfect flowers and those that always bear the pistils and stamens on separate blossoms. The various arrangements suggest the need of cross-fertilization in the economy of plant life.
This image is from: Luther Burbank: his methods and discoveries and their practical application. Volume 3 Chapter 3