Northern Pin Oak (Quercus ellipsoidalis)?
DBH:87.4 (cm) measured on 9/18/2020
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Quercus ellipsoidalis, thenorthern pin oakorHill's oak, is a North American species of trees native to the north-centraland south-central, primarily in theand the.It most commonly occurs on dry, sandy soils.
Although the common name suggests a resemblance to the(Q. palustris),Q. ellipsoidalishas traditionally been thought to be closely related to the(Q. coccinea), and was in fact included in that species by many botanists. Recent work suggests that there is more gene flow between Hill's oak and(Q. velutina), but the phylogenetic position of these species is still uncertain (Hipp and Weber 2008). The morphological similarity betweenQ. ellipsoidalisandQ. coccinearemains a source of confusion, especially in northwestern Indiana and southern Cook County, Illinois.
Quercus ellipsoidalisis a medium-sizedgrowing to 20 meters (66 feet) tall with an open, rounded crown. Theare glossy green, 7鈥�13cm (23鈦�4鈥�5in) long and 5鈥�10cm (2鈥�4in) broad, lobed, with five or seven lobes, and deep sinuses between the lobes. Each lobe has 3-7 bristle-tipped teeth. The leaf is nearly hairless, except for small tufts of pale orange-brown down where the lobe veins join the central vein. Thetend to be ellipsoid (-shaped, from which its scientific name derives), though they tend to be highly variable and range to globose, 6鈥�11mm (1鈦�4鈥�7鈦�16in) long and 10鈥�19mm (13鈦�32鈥�3鈦�4in) broad, a third to a half covered in a deep cup, green maturing pale brown about 18 months after; the kernel is very bitter. The inner surface of the acorn cap is glabrous (hairless) to sparsely or moderately pubescent, and the hairs if present tend to be kinky rather than straight.