Typical American Wild Plums
The American wild plum varies a good deal in different regions, but those here shown are typical-reddish in color, small in size, yellowish flesh, attractive though slight bloom, small stone clinging vigorously to the flesh. These plums possess a rich, characteristic flavor which has been introduced into many crossbred new varieties by Mr. Burbank.
This image is from: Luther Burbank: his methods and discoveries and their practical application. Volume 5 Chapter 2