These are the pecans I have at my home
1) is called a southern giant, as you can see, it's considerably larger than the others
2) is a stuart
4) Sure crop
6& 7) are unknown. these are old trees and no one knows what variety they are.
The Southern giant, Colby, Sure Crop, and hardy Giant are all grafted trees purchased from Stark Bros. Nursery Louisianna, MO. The stuart tree was given to me.
We do have pecans in Illinois, just not as big as in the south.