The shingle oak is a distinct species with narrow, smooth-edged leaves with no lobes. Bark is similar to several other red oak species; leaves are the best method to ID this tree.
Central eastern US, extending from eastern Kansas to southern Michigan to North Carolina. The distribution is spotty around the outer edges of its range.
Moist upland soils and bottomlands, well-drained soil, not usually in swamps.
Small, 1/2" to 3/4" with shallow caps that cover about 1/3 of the nut. Dark in color when ripe.
Willow Oak - Leaves of both species have no lobes, but those of shingle oak are larger and broader, and acorns are larger.
Laurel Oak - Similar leaf shape, but laurel oak is a small tree of the deep south, where shingle oak is nearly absent.