Within the Carya laciniosa article...


'Keystone'

An annually cropping, usually highly productive variety. The nuts are very large, tend to fall free of the husk and are unusually thin shelled, making them one of the easiest Shellbarks to crack. Selected in 1954 by Fayette Etter of Franklin County, Pennsylvania (Crawford 2016; Grauke 2019; Grimo Nut Nursery 2019).

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