Big and Handsome but Nameless Plum
This big flat plum is of very mixed ancestry. In shape it suggests the Kelsey, which was doubtless one ot its ancestors. Note the hollow under the seeds, from the breaking of the flesh which is a characteristic and an interesting peculiarity of this plum.
This image is from: Luther Burbank: his methods and discoveries and their practical application. Volume 5 Chapter 7