bur oak Fagaceae Quercus macrocarpa Michx.   symbol: QUMA2
	Leaf: Alternate, simple, 6 to 12 inches long, roughly obovate in shape, with many lobes. The two middle sinuses nearly reach the midrib dividing leaf nearly in half. The lobes near the tip resemble a crown, green above and paler, fuzzy below. Flower: Monoecious; male flowers are yellow-green, borne in long, drooping slender catkins, 2 to 4 inches long; female flowers are green tinged in red and appear as single, short spikes, both appear shortly after the leaves. Fruit: Acorns are quite large (1 1/2 inches long) and 1/2 enclosed in a warty cap that has a long-fringed margin, maturing in one growing season in late summer and fall. Twig: Quite stout, yellow-brown, often with corky ridges; multiple terminal buds are small, round, and may be somewhat pubescent often surrounded by thread-like stipules; laterals are similar, but smaller. Bark: Ashy gray to brown in color and quite scaly, but noticeably ridged vertically on large trees. Form: A large tree that often reaches over 100 feet tall with a long clear bole. In the open it becomes a very wide, spreading tree.
	USDAFS Silvics of North America - USDAFS Additional Silvics - Landowner Factsheet - USDA Plants Database Quercus macrocarpa is native to North America. Range may be expanded by planting. See states reporting bur oak (opens a new window).