red oak but does not get as large and is heavier
branched. The northern pin oak can be found in northeastern Iowa on moist,
sandy soils and clay upland.The leaf lobes are bristle tipped, with lobe sinuses reaching almost toleaf mid-vein. The leaves are leathery in texture, dark shiny green above. The twigs are bright reddish brown to dark gray-brown.
The acorn is oval with the cap covering almost one-half. The edge of the cup is not deeply fringed.
The tree has a pale yellow, thin underbark. The outer bark is rather smooth, with shallow, connected fissures. It is dark brown near the base of tree to gray brown above.
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