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Quercus macrocarpa, the bur oak or burr oak, is a species of oak tree native to eastern North America. It is in the white oak section, Quercus sect. Quercus, and is also called mossycup oak, mossycup white oak, blue oak, or scrub oak.
bur oak, (Quercus macrocarpa), North American timber tree belonging to the white oak group, distributed primarily throughout the central United States. It has become a popular ornamental and shade tree in urban areas because of its resistance to insect and fungal attack, drought, and air pollution.
26 cze 2023 · Bur oaks have large leaves—some of the largest of all oak species—with two deep sinuses in the middle. The oak leaf margins have five to seven lobes and a wedge shape. These round-lobed leaves measure 6” to 12” (15 – 30 cm) long. A distinguishing feature of the bur oak tree is its large round acorns sitting in deeply fringed caps.
Burr oak is mostly a tree of prairie edges, and is uncommon in New England. It produces the largest acorns of all the oaks, nearly the size of golf balls. Being exceptionally tolerant of drought, this tree is often used in roadside plantings and shelterbelts.
A bur oak tree can grow up to 80 feet tall and has a trunk diameter of 3-4 feet with a spread of 40-60 feet. They have a rounded crown and thick, bury leaves that give the tree its name. Bur oak leaves are large, thick, and have a deep, lobe-shaped indentation in the center. They are 6-12 inches long and have a hairy underside.
Bur oak leaves are alternate (single at each node) and simple, typically smooth and dark green on the upper surface and slightly hairy and pale green on the underside. They display pinnate venation, being oblong and obovate (broader at the tip than the base).
Majestic, Quercus macrocarpa (Bur Oak) is a large deciduous tree adorned with a very wide, open crown. The foliage of leathery, dark green, 5-9 lobed leaves, 12 in. long (30 cm), turns yellow to golden brown in the fall. Inconspicuous yellow-green catkins appear in spring as the leaves emerge.
