Juglans cinerea, commonly known as butternut or white walnut, is a species of walnut native to the eastern United States and southeast Canada.
Juglans cinerea
A butternut
Fossilized Juglans cinerea (fossil white walnut) in Pleistocene glacial sediments, Michigan
Butternuts killed by butternut canker
A walnut is the edible seed of any tree of the genus Juglans, particularly the Persian or English walnut, Juglans regia. They are accessory fruit because the outer covering of the fruit is technically an involucre and thus not morphologically part of the carpel; this means it cannot be a drupe but is instead a drupe-like nut.
Walnut kernel, halves
Walnuts
Inside of a walnut in growth
Three-segment walnut