Mossy Oak Fence

- Februari 06, 2018

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Live oak or evergreen oak is a general term for a number of unrelated oaks in several different sections of the genus Quercus that share the characteristic of evergreen foliage.

The name live oak comes from the fact that evergreen oaks remain green and "live" throughout winter, when other oaks are dormant and leafless. The name is used mainly in North America, where evergreen oaks are widespread in warmer areas along the Atlantic coast from southeast Virginia to Florida, west along the Gulf Coast to Louisiana and Mexico, and across the southwest to California.

Evergreen oak species are also common in parts of southern Europe and Asia, and are included in this list for the sake of completeness. These species, although not having "live" in their common names in their countries of origin, are colloquially called live oaks when cultivated in North America.

When the term live oak is used in a specific rather than general sense, it most commonly refers to the southern live oak (Quercus virginiana), the first species so named, and an icon of the Old South, but can often refer to other species regionally.

The southern live oak is the official state tree of Georgia.

In Texas, a small grove of live oaks is known as a mott.


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Wood and lumber

Live oak was widely used in early American butt shipbuilding. Because of the trees' short height and low-hanging branches, lumber from live oak was specifically used to make curved structural members of the hull, such as knee braces (single-piece, inverted L-shaped braces that spring inward from the side and support a ship's deck). In such cuts of lumber, the line of the grain would fall perpendicularly to lines of stress, creating structures of exceptional strength. Live oaks were not generally used for planking because the curved and often convoluted shape of the tree did not lend itself to be milled to planking of any length. Red oak or white oak was generally used for planking on vessels, as those trees tended to grow straight and tall and thus would yield straight trunk sections of length suitable for milling into plank lengths.

Live oak was largely logged out in Europe by the latter half of the 19th century, and was similarly sought after and exported from the United States until iron- and steel-hulled commercial vessel construction became the standard early in the 20th century. Live oak lumber is rarely used for furniture due to warping and twisting while drying.

It continues to be used occasionally when available in shipbuilding, as well as for tool handles for its strength, energy absorption, and density, but modern composites are often substituted with good effect. Dry southern live oak lumber has a specific gravity of 0.88, among the highest of North American hardwoods


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List of evergreen species in genus Quercus

  • Section Quercus. The white oaks - Europe, Asia, North Africa, North America, styles short; acorns mature in 6 months, sweet or slightly bitter, inside of acorn shell is hairless
    • Quercus arizonica - Arizona white oak - southwestern North America
    • Quercus fusiformis - (also Quercus virginiana var. fusiformis) Texas live oak - south central North America
    • Quercus geminata - sand live oak - southeastern North America
    • Quercus greggii - Gregg oak - Mexico
    • Quercus hinckleyi - Hinckley oak - Texas
    • Quercus ilex - Holm oak - southern Europe
    • Quercus minima - dwarf live oak - southeastern North America
    • Quercus oblongifolia - Mexican blue oak - southwestern North America
    • Quercus polymorpha - Mexican white oak or Monterrey oak - Mexico
    • Quercus pungens - sandpaper oak - south central North America
    • Quercus turbinella - shrub live oak - southwestern North America
    • Quercus virginiana - southern live oak - southeastern North America
  • Section Cerris. Europe, Asia, north Africa. Styles long; acorns mature in 18 months, very bitter, inside of acorn shell is hairless or slightly hairy
    • Quercus calliprinos - Palestine oak - western Asia
    • Quercus coccifera - Kermes oak - southern Europe
    • Quercus semecarpifolia - Himalayan oak - eastern Asia
    • Quercus suber - Cork oak - southwestern Europe
  • Section Protobalanus - Southwest USA, California coastal ranges and northwest Mexico, styles short, acorns mature in 18 months, very bitter, inside of acorn shell is woolly
    • Quercus cedrosensis -- Cedros Island oak -- Baja California
    • Quercus chrysolepis - canyon live oak - southwestern North America, especially coastal ranges of California
    • Quercus palmeri - Palmer oak - southwestern North America
    • Quercus tomentella - Channel Island oak - Channel Islands of California
    • Quercus vacciniifolia - huckleberry oak - California and southwestern North America
  • Section Lobatae. The red oaks - North, Central and South America, styles long, acorns mature in 18 months, very bitter, inside of acorn shell is woolly
    • Quercus agrifolia - coast live and sharpacorn oaks - California and Mexico
    • Quercus canbyi - Canby oak - Mexico
    • Quercus emoryi - Emory oak - southwestern North America
    • Quercus hemisphaerica - laurel oak - southeastern North America
    • Quercus humboldtii - South American oak - northern South America
    • Quercus laurifolia - swamp laurel oak - southeastern U.S.
    • Quercus hypoleucoides - silverleaf oak - southwestern North America
    • Quercus parvula - Santa Cruz Island and Shreve oaks - California
    • Quercus rysophylla - loquat leaf oak - Mexico
    • Quercus wislizeni - interior live oak - California and Mexico

  • See the list of Quercus species for a fuller listing of oaks, including deciduous species.

Source of the article : Wikipedia



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