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The stylized leaves of the white oak in their fall colors on this Pennsylvania Dutch hex sign are a symbol of strength; acorns denote youth and great prospects.{{{1}}} Template documentation [ view ] [ edit ] [ history ] [ purge ]
English: Vector illustration based on photo of a Silver Oak leaf cluster awarded by the United States Department of Defense to be worn as an add-on device on various awards and decorations to denote more than one bestowal of the decoration.
Quercus robur (from the Latin quercus, "oak" + robur derived from a word meaning robust, strong) was named by Carl Linnaeus in Species Plantarum (1753). [11] [12] It is the type species of the genus and classified in the white oak section (Quercus section Quercus). [13] It has numerous common names, including "common oak", "European oak" and ...
Conversely, oak groves in wetter areas that historically had closed canopies of large trees are becoming crowded with young oaks that grow thin and spindly, due to lack of fires that would clear out seedlings. [15] Chionodes petalumensis caterpillars feed on oak leaves, including those of Quercus garryana [20] and valley oak (Q. lobata). [21]
The Bigelow oak grows to a height of 12 metres (39 feet), with a diameter at breast height of 81 centimetres (32 inches) and gray flaking bark. [1] The leaves range from 3–8 cm (1 + 1 ⁄ 4 – 3 + 1 ⁄ 4 in) long by 2–4.5 cm wide, with shapes Duncan & Duncan describe as "narrowly obovate to oblanceolate or narrowly elliptic", with "broadly rounded and bristleless" tips. [1]
Chart illustrating leaf morphology terms. The following terms are used to describe leaf morphology in the description and taxonomy of plants. Leaves may be simple (that is, the leaf blade or 'lamina' is undivided) or compound (that is, the leaf blade is divided into two or more leaflets). [1]
Quercus acerifolia (also called maple-leaf oak) is a rare North American species of oak in the red oak section of Quercus (known as Lobatae). It is endemic to just four locations within the Ouachita Mountains of the State of Arkansas. [3] [4] The tree sometimes reaches a height of 15 meters (50 feet).
Quercus marilandica is a small deciduous tree growing to 15 meters (49 feet) tall, with bark cracked into rectangular black plates with narrow orange fissures. The leaves are 7–20 centimeters (3–8 inches) long and broad, and typically flare from a tapered base to a broad three-lobed bell shape with only shallow indentations.