Blackjack Oak - Quercus marilandica
Primarily a Southeastern tree, although its range extends to Pennsylvania and Iowa as well, Blackjack Oak is a small tree (40-50 feet) with a rounded top. This oak grows in sandy/clayey soils on rock outcroppings, to 3,000 feet. The bark is dark and broken into irregular plates, and the trunk is sometimes twisted. The branches are also thick and contorted. Nearly as broad as wide the 10-inch long leaves are oval, 3-5 lobed, and widened at the tip; they are covered with rusty-brown hairs beneath. The ¾-inch long acorns are rounded, and enclosed in a glossy cap.