Firm Sweet Plum Fruits
The surface dotting of the American varieties and the shape of the Japanese plum are shown in this attractive fruit, which is a complicated hybrid, the result of repeated crossing and selection. The native plums of America have had an important share, in producing some of Mr. Burbank's most prized varieties.
This image is from: Luther Burbank: his methods and discoveries and their practical application. Volume 5 Chapter 7