English oak Fagaceae Quercus robur L.   symbol: QURO2
	Leaf: Alternate, simple, obovate to oblong, 4 to 6 inches long, 3 to 7 pairs of rounded lobes with sinuses going halfway to midvein, very small ear-lobes at leaf base, very short petiole, dark shiny green above, paler blue-green beneath. Flower: Monoecious; males are slender yellow-green catkins 2 to 3 inches long; females are very small, in clusters of 2 to 4 in leaf axils, appear in early spring with the leaves. Fruit: Acorn, 3/4 to 1 inch long, narrow, borne singly or in clusters on a long stalk, cap covers about 1/3 of acorn, matures in one season. Twig: Moderate, yellow-brown, smooth; brown buds are angled, short and round with each scale edged in light brown. Bark: Gray-brown, and becoming deeply fissured with age. Form: A large tree with a round crown that can reach over 100 feet tall.
	USDA Plants Database Quercus robur is planted in the highlighted USDA hardiness zones to the left and is not known to widely escape cultivaton.