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The leaves are 3–6 centimetres (1– 2 + 1 ⁄ 2 inches) long, simple or wavy-toothed, leathery, dark green above, paler below. The acorns are 1.5–2 cm ( 5 ⁄ 8 – 3 ⁄ 4 in) long, blackish-brown, and mature in 6–8 months from pollination; the kernel is sweet, and is an important food for people and for certain other mammals .
Quercus agrifolia, the California live oak, [3] or coast live oak, is an evergreen [4] live oak native to the California Floristic Province.Live oaks are so-called because they keep living leaves on the tree all year, adding young leaves and shedding dead leaves simultaneously rather than dropping dead leaves en masse in the autumn like a true deciduous tree. [5]
Several oak trees hold cultural importance; such as the Royal Oak in Britain, [116] the Charter Oak in the United States, [117] and the Guernica oak in the Basque Country. [118] " The Proscribed Royalist, 1651 ", a famous painting by John Everett Millais , depicts a Royalist hiding in an oak tree while fleeing from Cromwell's forces.
Bark on a mature Gambel oak. Quercus gambelii trees differ in size from one location to another. The average mature height is from 3–9 metres (10–30 feet), but occasionally reaches heights of 18 m (59 ft) in some locations. Dwarf stands of plants under 1 m (3 + 1 ⁄ 4 ft) tall are common in marginal areas where heavy browsing occurs. [4]
The cork oak grows as an evergreen tree, reaching an average height of 10 to 15 metres (33 to 49 feet) or in rare cases up to 25 m and a trunk diameter of 50 to 100 centimetres (20 to 39 inches). It forms a dense and asymmetrical crown that starts at a height of 2–3 m (6 + 1 ⁄ 2 –10 ft) and spreads widely in free-standing trees. The crown ...
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The Jurupa Oak, or Hurungna Oak, [1] [2] is a clonal colony of Quercus palmeri (Palmer's oak) trees in the Jurupa Mountains in Crestmore Heights, Riverside County, California. The colony has survived an estimated 13,000 years through clonal reproduction, [ 3 ] [ 4 ] [ 5 ] making it one of the world's oldest living trees . [ 5 ]
The larvae (or caterpillars) emerge in April and initially eat the buds of oak trees and young leaves inside them. [1] [6] When fully grown, the larvae are between 25 and 29 millimetres (0.98 and 1.14 in) long with a body that can be yellow-green or darker shades of green.