Branch of 1909 Cherries
The number 1909 here refers not to the actual number of cherries, but to the season In which they were first developed. They appeared that year on one of the branches of the famous tree, and they were at once seen to have such qualities as to merit further attention. The branch was therefore multiplied by grafting, and the new variety assured permanence. As yet, however, it has not been named.
This image is from: Luther Burbank: his methods and discoveries and their practical application. Volume 4 Chapter 3