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Quercus acutissima is a medium-sized deciduous tree growing to 25–30 metres (82–98 feet) tall with a trunk up to 1.5 m (5 ft) in diameter. The bark is dark gray and deeply furrowed. The leaves are 8–20 centimetres ( 3 + 1 ⁄ 4 – 7 + 3 ⁄ 4 inches) long and 3–6 cm ( 1 + 1 ⁄ 4 – 2 + 1 ⁄ 4 in) wide, with 14–20 small saw-tooth ...
It is fast-growing and usually has a pleasing red color in autumn, much more reliably so than the pin oak. This species was for years erroneously called Quercus nuttallii , but it is now known as Q. texana ; this has created much confusion with Texas red oak , which was known as Q. texana but is now known as Q. buckleyi .
On the one hand, the researchers found, trees in forests "desire" to grow as tall as possible to overtake neighboring trees and reach stronger sunlight. On the other hand, gravity makes it more and more difficult to haul water upwards from the roots to the canopy as the tree grows, and leaves thus become smaller near the top. They discovered ...
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 .
Overcup oak acorns, showing the nut largely enclosed by the acorn cup. Quercus lyrata is a medium to large-sized deciduous tree, growing as tall as 47 meters (154 feet), with an average height of 24 m (79 ft). [1] The trunk averages up to 80 centimetres (31 inches) in diameter, or rarely to 140 cm (55 in).
The Mexican blue oak is a small evergreen tree growing 5–8 metres (16–27 feet) tall with a rounded crown. At higher elevations it is typically a large shrub. The trunk is up to 50 centimetres (20 inches) in diameter and the bark is light gray and densely furrowed. The twigs are yellowish brown and hairless with reddish brown buds.
In the northern part of its range, Quercus velutina is a relatively small tree, reaching a height of 20–25 metres (66–82 feet) and a diameter of 90 centimetres (35 inches), but it grows larger in the south and center of its range, where heights of up to 42 m (138 ft) are known.
Quercus ellipsoidalis, the northern pin oak or Hill's oak, is a North American species of oak tree native to the north-central United States and south-central Canada, primarily in the Great Lakes region and the Upper Mississippi Valley. [2] It most commonly occurs on dry, sandy soils. [3]