Quercus ellipsoidalis, the northern pin oak or Hill's oak, is a North American species of trees native to the north-central United States and south-central Canada, primarily in the Great Lakes region and the Upper Mississippi Valley. It most commonly occurs on dry, sandy soils. Although the common name suggests a resemblance to the pin oak (Q. palustris), Q. ellipsoidalis has traditionally been thought to be closely related to the scarlet oak (Q. coccinea), and was in fact included in that species ...
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