. Bulletin (Pennsylvania Department of Forestry), no. 11. Forests and forestry. PLATE LXVIII. BLACK JACK OAK. 1. Fldwrriiiii iM-iUK li witli immature leaves, (s) staniinate blossoms, (i) ininiatuit' a(<nns, x I. 2. Iliiincli Mitli mat lire Iravcs. immature ami mature , x â ^. '.',. All aeorn cup, X i. 4. An acorn, x i. , , , , ^ ^. i 5. WiiittT iwisi witii iinmntiiic :i""nis. ImkIs, ami ,;'al-scais, x u. 6. ,Sf-11011 of a winter twig, enlarged. ([)) pistillate blossoms, 145 BLACK JACK OAK. Quercus marilandica, Muench. FOBMâThis tree usually attains a height of 20-80 ft. wit
. Bulletin (Pennsylvania Department of Forestry), no. 11. Forests and forestry. PLATE LXVIII. BLACK JACK OAK. 1. Fldwrriiiii iM-iUK li witli immature leaves, (s) staniinate blossoms, (i) ininiatuit' a(<nns, x I. 2. Iliiincli Mitli mat lire Iravcs. immature ami mature , x â ^. '.',. All aeorn cup, X i. 4. An acorn, x i. , , , , ^ ^. i 5. WiiittT iwisi witii iinmntiiic :i""nis. ImkIs, ami ,;'al-scais, x u. 6. ,Sf-11011 of a winter twig, enlarged. ([)) pistillate blossoms, 145 BLACK JACK OAK. Quercus marilandica, Muench. FOBMâThis tree usually attains a height of 20-80 ft. with a diameter of 18 inches, but may reach a height of 60 ft. with a diameter of 3 feet. It reaches its maximum size in Texas and Arkansas. Crown usually compact, round-topped, and narrow on account of short branches. Upper branches are ascending, lower ones spreading. BARKâThick, roughened by deep fiissures which separate broad angular plates covered with dark brown to nearly black scales. TWIGSâStout, coated at first with pale woolly covering of hairs, later becoming emooth and dark brown to gray. BXJDSâAlternate, ovate, distinctly angular, sharp-pointed, } of an inch long, reddish-brown and rusty pubescent. LEAVESâAlternate, simple, broadly ovate In outline, 6-7 inches long with an almost equal width, rounded or heart-shaped at the base, 3-6-lobed. Mature leaves deep green, thick, leathery, and smooth above; often rusty brown below. LEAF-SCABSâSee "Loaf-Scars" under White Oak, page 132. FLOWEBSâAppear about May when the leaves are i developed. Stamlnate flowers in slender, often persistent aments 2-4 inches long. Pistillate flowers on short, stout, pubes- cent stalks. FBTTITâAn acorn, maturing at the end of the second season, solitary or paired, short stalked. Nut ovoid i of an inch long, nearly same width throughout, often striate, light brown. Cfup hemispheric, deep, covers one-half or over of nut, light brown and downy on inside, covered by large reddish-
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