Monday, January 7, 2019
Black Jack Oak - Quercus marilandica
The Black Jack Oak - Quercus marilandica, is a small to mid sized deciduous tree that reaches heights of only 15 - 45 feet tall. Black Jack Oak often grows in an irregular shape with an open crown and crooked branches. It is one of the fews Red Oaks that produce and store a substance called tyloses, this substance seals the vessels and make the wood watertight. The small trees lumber is not highly valuable because of it's small size and knotty qualities it is used for fence posts, wooden water buckets, railroad ties, firewood and charcoal. Black Jack Oak is native to dry, sandy or soils from Iowa in the West, New Jersey and New York in the North, South through Florida, West through Texas and Northern Nebraska.
Image Citation: David Stephens, Bugwood.org
The leaves of the Black Jack Oak are tough and leathery, triangular and 4-8 inches long and wide. The leaf stalk or petiole and lower surface are covered with dense brown-orange hairs. The veins are raised on both the upper and lower leaf surfaces. Acorns occur singularly or in pairs on a short stalk with red-brown top shaped cups with hairy scales. The nuts are elliptic, 1/2 to 3/4 of an inch each, with a stout point.
Image Citation: Vern Wilkins, Indiana University, Bugwood.org