Bluejack oak is a small tree that only reaches heights of 30' to 50'. It is often shrubby, with an irregular crown and short, crooked trunk. Bark: The grayish black bark is thick with blocky furrows and rough ridges. Leaves: The leaves are simple, alternately arranged, and may persist on the tree until spring. Blackjack Oak The blackjack oak (Quercus marilandica) is also known as the Jack oak, black oak, and barren oak. A small deciduous tree that grows 20 to 30 feet (maximum 90 feet) with a trunk diameter of 1 foot or less. It is similar to the post oak which also grows with blackjack oak, but the leaf lobes are more pronounced and not bristle-tipped. Most people chose this as the best definition of blackjack-oak: Quercus marilandica. See the dictionary meaning, pronunciation, and sentence examples. On March 25th 2017, the Blackjack Oak leafed out nicely. On April 1st 2017, the new leaves of the Blackjack Oak were slowly fading from pink to pastel green, and taking on their unique shape. In the summer of 2017, this tree became afflicted with the same mysterious yellow spots as the Nuttall Oaks and the Red Maple. This week we are looking at an oak species, one that is native here in the Southeastern states, the Blackjack oak, Quercus marilandica. Now, oaks are all contained within the genus.
Also found in: Thesaurus, Encyclopedia, Wikipedia.| Noun | 1. | blackjack oak - a common scrubby deciduous tree of central and southeastern United States having dark bark and broad three-lobed (club-shaped) leaves; tends to form dense thickets blackjack, jack oak, Quercus marilandica scrub oak - any of various chiefly American small shrubby oaks often a dominant form on thin dry soils sometimes forming dense thickets |
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Blackjack Oak Tree Definition Biology
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Blackjack Oak
Latin: Quercus marilandica
This summer's drought has been tough on trees. The drive between Fayetteville and Little Rock is punctuated with whole hillsides of brown and seemingly lifeless trees.
While these trees - mostly oaks, hickories, dogwoods and elms - look bad from a distance, most will survive the rigors of the 2000 drought without much problem. Summers like this help one appreciate the really tough trees such as the blackjack oak.
A kid I knew in my youth was scrappy and always getting into fights. His favorite saying was, 'When you're ugly you gotta be tough.' Mother Nature has applied this simple truism to the blackjack oak because it is one ugly, but tough tree.
Blackjacks are found throughout most of the eastern woodlands, occupying sites with soil too poor or dry for oaks with more stature and substance to flourish. It was one of the few tree species to venture onto the Great Plains before white settlement, occupying a region from central Texas northeast through Oklahoma known as the cross timber region.
The blackjack is a small, gnarly tree usually under 35 feet tall with a round crown and leathery, three-lobed leaves. It is a member of the red oak tribe and has the characteristic leaf spine at the end of each lobe. The leaves hang on the tree through the winter to be pushed off by new leaves the following spring. It's trunk is often deeply furrowed and black, giving it a brooding wintertime appearance.
The Rodney Dangerfield of oaks, blackjacks are given but one use - firewood - by most authors who seem overly hung up on the notion that all oaks reach the pinnacle of their glory at the saw mill.
It might be instructive to speculate on the long term effects of this summer's drought on the survival and health of the forest. As bad as the trees look, most will survive the drought because they have been forced into an early dormancy to conserve water.
Unfortunately, that is not the end of the story. The oaks of our eastern forest are systemically infected with a fungus called Hypoxylon canker - sort of the athlete's foot of the oak kingdom.
Survey work conducted by Dr. Pat Finn at the UofA following the severe drought of 1980 showed that about 80 percent of the oaks of northwest Arkansas have this systemic infection. This fungus is usually benign and does no apparent harm, but droughts cause it to flare up. Certain trees -- with no discernable pattern -- are killed by the multiplying hyphae of the fungus as it produces its spores on fungal mats under the bark of the tree. These fungal mats push the bark off which accumulates at the base of the tree like a rain of deadly dandruff.
For the health of the forest, Hypoxylon is a beneficial fungus because it thins the stand of trees. In 1980, the disease killed about 12 percent of the oaks in some areas, thus allowing the survivors more opportunity to obtain water.
Unfortunately most of us that build our homes in the woodland have difficulty taking the long view on ecology when the tree in front of our house is the one that dies. About all that can be done to ward off the effects of this problem is to keep the drought at bay by watering before conditions become too severe.
Blackjacks are not in the nursery trade and many who have them on their property treat them with little respect. But, before dismissing this tough tree as a scrub oak and relegating it to the woodpile, reflect on its toughness and adaptability under adverse conditions.
By: Gerald Klingaman, retired
Extension Horticulturist - Ornamentals
Extension News - September 22, 2000
Blackjack Oak Tree Pictures
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