English Oak (Quercus robur) - tree - September 2017
A large English oak at the Hill Barton industrial estate of Exeter, UK. === http://ift.tt/2xFTY0K... English oak is probably the best known and loved of British native trees. It is the most common tree species in the UK, especially in southern and central British deciduous woods. The acorns are not produced until the tree is at least 40 years old. Peak acorn fecundity usually occurs around 80 – 120 years. English oak is a large deciduous tree up to 20-40m tall. In England, the English oak has assumed the status of a national emblem. As common oaks mature they form a broad and spreading crown with sturdy branches beneath. Their open canopy enables light to penetrate through to the woodland floor, allowing bluebells and primroses to grow below. Their smooth and silvery brown bark becomes rugged and deeply fissured with age. Oak tree growth is particularly rapid in youth but gradually slows at around 120 years. Oaks even shorten with age in order to extend their lifespan. The leaves are around 10cm long with 4-5 deep lobes with smooth edges. Leaf-burst occurs mid-May and the leaves have almost no stem and grow in bunches. The flowers are long yellow hanging catkins which distribute pollen into the air. Its fruit, commonly known as acorns, are 2–2.5cm long, borne on lengthy stalks and held tightly by cupules (the cup-shaped base of the acorn). As it ripens, the green acorn takes on a more autumnal, browner colour, loosens from the cupule and falls to the canopy below. Most acorns will never get the chance to germinate, they are rich food source, eaten by many wild creatures including jays, mice and squirrels. Acorns need to germinate and root quickly to prevent drying out or becoming victims of the harvest. Following successful germination, a new sapling will appear the following spring. === Other common names common oak aac black oak French oak pedunculate oak Polish oak Slavonian oak === Least Concern (IUCN 3.1) Scientific classification Kingdom: Plantae (unranked): Angiosperms (unranked): Eudicots (unranked): Rosids Order: Fagales Family: Fagaceae Genus: Quercus Section: Quercus Species: Q. robur Binomial name Quercus robur
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