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CommentsShingle Oak is one of two oaks (Quercus spp.) in Illinois that has leaves with smooth margins; other oaks have pinnatifid leaves. The other oak species with smooth-margined leaves, Quercus phellos (Willow Oak), is found in southern Illinois. The leaves of Willow Oak are more narrow (½" or less) than those of Shingle Oak. At one time, the wood of Shingle Oak was used to make wooden shingles for houses, hence the common name. Other common names for this tree are Jack Oak and Northern Laurel Oak.