English oak Fagaceae Quercus robur
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:Species is 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.