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While the list of varieties of pecans is comparatively small, yet a surprisingly large number of names has been used. The attempt has been made to collect all the names which have appeared in different publications. These have presumably all been applied to some pecan at some time or other, but many of them have never been propagated by budding or grafting and a very large proportion of them have been lost track of entirely. In short, they are now represented by names only. However, they are all given, for the reason that it would be well not to apply any of these names to other varieties. It might be well to emphasize the fact that many meritorious varieties would be the better for re-naming.

In the original descriptions, it will be noted that the thickness of the shell is given in millimeters. A piece of the shell about the center of the side covering the back of the half kernels, was accurately measured. These measurements must not be regarded as absolute, but they are comparative. All nut illustrations are natural size.

For the origin and synonomy of many varieties credit must be given to the excellent work of Mr. William A. Taylor, of the United States Department of Agriculture, who has probably done more than any one else to straighten out the tangled nomenclature of the pecan.