The Primus Berry
This highly interesting plant is one of the first that could properly be termed a new species developed under the direct guidance of the hand of the experimenter. It is the progeny of the California dewberry and a hardy little berry indigenous to Siberia and Russia, called the Siberian raspberry. The remarkable Primus berry appeared as a first generation hybrid, and it breeds true, having the characteristics of a new and permanent species.
This image is from: Luther Burbank: his methods and discoveries and their practical application. Volume 6 Chapter 2