The field guide helps identify common Indiana woodlot trees. Each week ... Under the surface of the bark is a dark, chocolate brown color. Black walnut trees produce nuts, which are ridged and rounded ...

A nut used in herbal tea has become a hydrogel ... "You never saw the fruit from a tree expand in that kind of volume," said first author Changxu Sun, a UChicago PME Ph.D. student.

Another variety that’s common in Louisiana is Stuart ... which have been bred to produce larger nuts). Nuts from native pecan trees tend to be small, flavorful and have high oil content.