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The Blackjack Oak (Quercus marilandica) is a low to medium-sized scrubby tree with thick, glossy, leathery, shallow-lobed leaves that are brownish-scaly or with rusty hairs beneath. The club-shaped leaves account for the common name. The dark trunk bark is broken into squarish blocks. Blackjack Oaks grow in dry or sterile, especially sandy, soil with clay subsoils from southern New York to southern Iowa south to Florida and Texas (U.S.A.). This species may be found up to around 300 m elevation.

As is the case for many oak species, the acorns of the Blackjack Oak, which are borne singly or in pairs on short stalks, mature in two seasons on the previous year's branchlets. Dead branches may remain on the tree for years. This is one of the major species of the New Jersey Pine Barrens and is also often found in association with Post Oak (Q. stellata) in the "Post Oak savannah" that is a transition between the forests of the eastern United States and the western prairie. The Blackjack Oak hybridizes with the Bear Oak (Q. ilicifolia), forming a vegetatively persistent and often locally abundant hybrid known as Q. X brittonii W.T. Davis

(Elias 1980; Petrides 1988; Gleason 1991; Sibley 2009)

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