Many oaks in the white oak group and Quercus robur have highly variable, similar leaves with rounded lobes. Quercus alba often has deeply lobed leaves, light gray bark usually with smooth patches, and an acorn cup covered with warty scales. Quercus lyrata has leaves that are inversely egg-shaped with irregular, rounded lobes, and an acorn cup that nearly covers the nut. Quercus macrocarpa has deeply lobed leaves that are inversely egg-shaped and hairy beneath, often corky-ridged twigs, and an acorn cup with long fringes along the margin. Quercus robur has very short-stalked leaves with ear-like lobes at the base, and a long-stalked acorn cup.
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