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Burrs on a tree trunk in Norfolk, England. A burl (American English) or burr (British English) is a tree growth in which the grain has grown in a deformed manner. It is commonly found in the form of a rounded outgrowth on a tree trunk or branch that is filled with small knots from dormant buds. Burl formation is typically a result of some form ...
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 .
The tree was already around 200 years old when the Lewis and Clark Expedition passed nearby. The size of the tree has made coring and accurate dating difficult. It has been the state champion Bur Oak since 1987. [2] The tree has survived many droughts and floods, including the Great Flood of 1993, when water stood nearly 6.5 ft deep around its ...
The green ball-shaped fruits appear in early summer and remain on the tree until fall. The burs split open when ripe, revealing 1 to 4 edible nuts inside. Dean Schoeppner . Sweet Gum.
A bur (also spelled burr) [1] is a seed or dry fruit or infructescence that has hooks or teeth. The main function of the bur is to spread the seeds of the bur plant, often through epizoochory . The hooks of the bur are used to latch onto fur or fabric, enabling the bur – which contain seeds – to be transported to another location for ...
Unlike many other members of the family Asteraceae, whose seeds are airborne with a plume of silky hairs resembling miniature parachutes, cocklebur seeds are produced in a hard, spiny, globose or oval double-chambered, single-seeded bur 8–20 mm (0.32–0.79 in) long. It is covered with stiff, hooked spines, which stick to fur and clothing and ...
Maclura pomifera, commonly known as the Osage orange (/ ˈ oʊ s eɪ dʒ / OH-sayj), is a small deciduous tree or large shrub, native to the south-central United States.It typically grows about 8 to 15 metres (30–50 ft) tall.
Quercus bicolor, the swamp white oak, is a North American species of medium-sized trees in the beech family. It is a common element of America's north central and northeastern mixed forests. It can survive in a variety of habitats. It forms hybrids with bur oak where they occur together in the wild.