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Quercus macrocarpa, Michx. Bur Oak. Mossy Cup Oak. Fig. 3306. Tree, to 80, sometimes 160 ft., with large spreading branches, forming a broad, round head: bark light brown, deeply furrowed; younger branches sometimes with corky wings:lvs. obovate or oblong-obovate,lyrate-pinnatifid, with 4-10 pairs of lobes, the lower ones smaller, separated by wide and deep sinuses, the upper ones much larger, or sometimes the lvs. are only sinuately dentate above the middle, bright green and shining above, grayish or whitish tomentose beneath, 4-8 in. long: fr. sessile or short-stalked; acorn broadly ovate or ovoid, 3/4-1 1/2 in. high, embraced about one-half by the large 3/4-2-in.-wide
cup, with the upper scales awned and forming a fringe-like border. Nova Scotia to Pa., west to Man. and Texas. S.S. 8:371, 372. Em. 1:149. G.F. 2:500; 3:407. Mn. 2:153. Gng. 4:342.
Var. olivaeformis, Gray (Q. olivaeformis, Michx.). Lvs. deeply pinnatifid, lobes almost all narrow and separated by wide sinuses: cup usually elongated, much higher than broad. S.S.
8:373. M.D.G. 1901:167.—The bur oak is of vigorous growth and becomes a stately tree and
is of picturesque appearance in winter with its corky branches. The crown is often fan-shaped until tree is mature.
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==Cultivation==
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===Propagation===
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===Pests and diseases===
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==Species==
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==Gallery==
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==References==
*[[Standard Cyclopedia of Horticulture]], by L. H. Bailey, MacMillan Co., 1963
<!--- xxxxx *Flora: The Gardener's Bible, by Sean Hogan. Global Book Publishing, 2003. ISBN 0881925381 -->
<!--- xxxxx *American Horticultural Society: A-Z Encyclopedia of Garden Plants, by Christopher Brickell, Judith D. Zuk. 1996. ISBN 0789419432 -->
<!--- xxxxx *Sunset National Garden Book. Sunset Books, Inc., 1997. ISBN 0376038608 -->
==External links==
*{{wplink}}
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