I have a cut leaf black walnut tree, of value as an ornamental, which
originated in Pennsylvania. Although it had catkins for several seasons,
not until the past season did it produce, and then only one lone nut.
The husk of that nut had a smooth exterior similar to that of a Persian
walnut; but it lacked the characteristic black walnut odor. In fact, it
had none. If this tree has any Persian walnut blood in its makeup, that
hybrid strain may have manifested itself in the foliage; in any event,
there was an influence of some kind that caused the change in the usual
type of foliage. I was more interested in planting the nut to see what
kind of foliage the seedling will have rather than in cracking it for
examination to determine its value as a nut.