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Semi-Double Shastas

Here are some Shastas in which the tendency to increase of ray flowers shown in an earlier picture has been accentuated through selection, until comparatively little of the central seedbearing portion of the flower remains. Contrast this flower with the little ox-eye, as showing vividly the changes that may be wrought in a flower in the course of a few generations of selective breeding.

Semi-Double Shastas

This image is from: Luther Burbank: his methods and discoveries and their practical application. Volume 9 Chapter 5