Strawberry Blossom Ready for Pollenating
Some varieties of strawberries bear perfect flowers as illustrated in this specimen, and others have blossoms that bear the pistils separately. It is necessary, in cultivating the strawberry, to bear this in mind, and if a pistillate variety is planted there must be pollen-bearers in the neighboring rows, otherwise there would be no crop of berried. The bees are depended on to effect the transfer of pollen. In the perfect flowers, the stamens and pistils mature at different periods, to guard against self-fertilization.
This image is from: Luther Burbank: his methods and discoveries and their practical application. Volume 3 Chapter 3