A Pecan Tree
The pecan is closely related to the hickory, but is a much less hardy tree, being confined to our southern states. It sometimes hybridizes with the hickory in the wild state, and it is possible that new and hardy varieties of nuts might be produced by selection among the progeny of such a cross. The pecan is rapidly assuming importance as a commercial nut.
This image is from: Luther Burbank: his methods and discoveries and their practical application. Volume 11 Chapter 5