FAGACEAE - - Beech Family

Quercus marilandica Muenchhausen — Blackjack Oak

Blackjack Oak (Quercus marilandica) - Tree becoming 20 m. tall, the bark dark-brown or nearly black, broken into irregular plates or blocks, very rough; leaf-blades broadly or narrowly obovate in outline, 8—17 cm. long, 3—5 lobed or with a single dilated terminal lobe, brownish-pubescent beneath; acorns sessile or short-stalked; cup turbinate or hemispheric-turbinate, 16—20 mm. wide; nut subglobose or ovoid, 10—20 mm. long.

Habitat:

Upland forests and woodlands, usually on periodically droughty soils, as over shrink-swell clays, sandstones, deep sands, sands with clay lenses, and shallow soils over acidic bedrock. Blackjack oak has long been considered an indicator of poor soil and is avoided by farmers, as unproductive.

Habitat information from:
Weakley, Alan S., Flora of the Southern and Mid-Atlantic States, Working Draft of 21 May 2015.

The range of Quercus marilandica (Blackjack Oak)

Kartesz, J.T., The Biota of North America Program (BONAP). 2015. North American Plant Atlas. (http://bonap.net/napa). Chapel Hill, N.C. [maps generated from Kartesz, J.T. 2015. Floristic Synthesis of North America, Version 1.0. Biota of North America Program (BONAP). (in press)].

The Georgia range of Quercus marilandica (Blackjack Oak)

Zomlefer, W.B., J.R. Carter, & D.E. Giannasi. 2014 (and ongoing). The Atlas of Georgia Plants. University of Georgia Herbarium (Athens, Georgia) and Valdosta State University Herbarium (Valdosta, Georgia). Available at: http://www.georgiaherbaria.org/.