In botany, a tree is a perennial plant with an elongated stem, or trunk, supporting branches and leaves in most species. In some usages, the definition of a tree may be narrower, including only woody plants with secondary growth, plants that are usable as lumber or plants above a specified height. Trees are not a taxonomic group but include a variety of plant species that have independently evolved a woody trunk and branches as a way to tower above other plants to compete for sunlight. In looser senses, the taller palms, the tree ferns, bananas and bamboos are also trees. Trees tend to be long-lived, some reaching several thousand years old. The tallest known tree, a coast redwood named Hyperion, stands 115.6 m (379 ft) high. Trees have been in existence for 370 million years. It is estimated that there are just over 3 trillion mature trees in the world.
A tree typically has many secondary branches supported clear of the ground by the trunk. This trunk typically contains woody tissue for strength, and vascular tissue to carry materials from one part of the tree to another. For most trees it is surrounded by a layer of bark which serves as a protective barrier. Below the ground, the roots branch and spread out widely; they serve to anchor the tree and extract moisture and nutrients from the soil. Above ground, the branches divide into smaller branches and shoots. The shoots typically bear leaves, which capture light energy and convert it into sugars by photosynthesis, providing the food for the tree's growth and development. Flowers and fruit may also be present, but some trees, such as conifers, instead have pollen cones and seed cones; others, such as tree ferns, produce spores instead.
Trees play a significant role in reducing erosion and moderating the climate. They remove carbon dioxide from the atmosphere and store large quantities of carbon in their tissues. Trees and forests provide a habitat for many species of animals and plants. Tropical rainforests are one of the most biodiverse habitats in the world. Trees provide shade and shelter, timber for construction, fuel for cooking and heating, and fruit for food as well as having many other uses. In parts of the world, forests are shrinking as trees are cleared to increase the amount of land available for agriculture. Read more ...
Trees hold great fascination for humanity from their beauty, symbology, and a connectedness to nature. The forest has been the backdrop for poetry, stories, and art since ancient times. Mythologies always mention trees, often linking them symbolically to Creation and the World Tree in one design or another.
Trees have been venerated since time immemorial. In Norse mythology, Yggdrasil is a central cosmic tree whose roots and branches extend to various worlds. Various creatures live on it.
To the ancient Celts, certain trees, especially the oak, ash and thorn, held special significance as providing fuel, building materials, ornamental objects and weaponry.
Other cultures have similarly revered trees, often linking the lives and fortunes of individuals to them or using them as oracles.
In Greek mythology, dryads were believed to be shy nymphs who inhabited trees.
The Oubangui people of west Africa plant a tree when a child is born. As the tree flourishes, so does the child but if the tree fails to thrive, the health of the child is considered at risk. When it flowers it is time for marriage. Gifts are left at the tree periodically and when the individual dies, their spirit is believed to live on in the tree.
Trees have their roots in the ground and their trunk and branches extended towards the sky. This concept is found in many of the world's religions as a tree which links the underworld and the earth and holds up the heavens.
In India, Kalpavriksha is a wish-fulfilling tree, one of the nine jewels that emerged from the primitive ocean. Icons are placed beneath it to be worshipped, tree nymphs inhabit the branches and it grants favors to the devout who tie threads round the trunk.
Democracy started in North America when the Great Peacemaker formed the Iroquois Confederacy, inspiring the warriors of the original five American nations to bury their weapons under the Tree of Peace, an eastern white pine (Pinus strobus).
In the creation story in the Bible, the tree of life and the knowledge of good and evil was planted by God in the Garden of Eden.
Sacred groves exist in China, India, Africa and elsewhere. They are places where the deities live and where all the living things are either sacred or are companions of the gods. Folklore lays down the supernatural penalties that will result if desecration takes place for example by the felling of trees. Because of their protected status, sacred groves may be the only relicts of ancient forest and have a biodiversity much greater than the surrounding area. Some Ancient Indian tree deities, such as Puliyidaivalaiyamman, the Tamil deity of the tamarind tree, or Kadambariyamman, associated with the kadamba tree were seen as manifestations of a goddess who offers her blessings by giving fruits in abundance.
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Do Trees Sleep at Night? Live Science - May 24, 2016
After a long a long day of photosynthesizing, do trees fall asleep? It depends on how you define "sleep," but trees do relax their branches at night, which might be a sign of snoozing, scientists said. In the only reported study to look at tree siestas, researchers set up lasers that measured the movements of two silver birch trees (Betula pendula) at night. One tree was in Finland and the other in Austria, and both were monitored from dusk until morning on dry, windless nights in September. This was close to the solar equinox, when daylight and nighttime are about equal.
Trees that can walk up to 20 meters a year BBC - December 18, 2015
It takes a whole day to travel from Ecuador's capital, Quito, to the heart of the Unesco Sumaco Biosphere Reserve, some 100km to the southeast. The journey entails three hours by car to the edge of the forest, and then anywhere from seven to 15 hours by boat, mule and foot, mostly uphill and on a muddy road, to reach the interior. But the effort is worth it, considering you wind up in the middle of a pristine forest that houses a rather unusual find: walking palm trees.
Earth's trees number 'three trillion' BBC - September 3, 2015
There are just over three trillion trees on Earth, according to a new assessment. The figure is eight times as big as the previous best estimate, which counted perhaps 400 billion at most.
How to make trees grow bigger and quicker Science Daily - April 16, 2015
Scientists at The University of Manchester have discovered a way to make trees grow bigger and faster, which could increase supplies of renewable resources and help trees cope with the effects of climate change. The genes, called PXY and CLE, control the growth of a tree trunk. When over-expressed, making them more active than in their normal state, the trees grew twice as fast as normal and were taller, wider and had more leaves.
World's Oldest Trees: 3,000 to 9,500 Years Old The Epoch Times - August 19, 2014
1. Norway Spruce, Sweden
2. Methuselah, Bristlecone Pine, California
3. Llangernyw Yew, Wales
4. Sarv-e Abar, Cypress, Iran
5. The General Sherman Tree, Sequoia, California
6. The Senator, Bald Cypress, Florida
7. Te Matua Ngahere, Kauri, New Zealand
8. Jomon Sugi, Japan
9. Pando, Quaking Aspens, Utah
Pine Tree Yields Longest Genome Ever Sequenced Live Science - March 22, 2014
Scientists say they've generated the longest genome sequence to date, unraveling the genetic code of the loblolly pine tree. Conifers have been around since the age of the dinosaurs and they have some of the biggest genomes of all living things. Native to the U.S. Southeast, the loblolly pine (Pinus taeda) can grow over 100 feet (30 meters) tall and it has a lengthy genome to match, with 23 billion base pairs. That's more than seven times the size of the human genome, which has 3 billion base pairs. (These pairs form sequences called genes that tell cells how to make proteins.)
180 million-year-old fossilized fern nearly identical to modern relative PhysOrg - March 21, 2014
A trio of researchers in Sweden has unearthed a fossilized fern that has been dated to 180 million years ago, that remarkably, is in near pristine condition. The calcified stem of a royal fern dating back to the early Jurassic period was apparently preserved by mineral precipitation from hydrothermal brines as they rapidly crystalized, trapping the fern, which was clearly alive at the time, encasing it in an airtight environment. Although very small (just 5.8 x 4.1 cm) the fossil was so well preserved that the researchers were still able to make out cell cytoplasm, nuclei and even chromosomes.
Iconic Australasian trees found as fossils in South America PhysOrg - January 9, 2014
Today in Australia they call it Kauri, in Asia they call it Dammar, and in South America it does not exist at all unless planted there; but 52 million years ago the giant coniferous evergreen tree known to botanists as Agathis thrived in the Patagonian region of Argentina, according to an international team of paleobotanists, who have found numerous fossilized remains there. These spectacular fossils reveal that Agathis is old and had a huge range that no one knew about from Australia to South America across Antarctica.
Weird Forests Once Sprouted in Antarctica Live Science - November 2, 2013
Strange forests with some features of today's tropical trees once grew in Antarctica, new research finds. Some 250 million years ago, during the late Permian and early Triassic, the world was a greenhouse, much hotter than it is today. Forests carpeted a non-icy Antarctic. But Antarctica was still at a high latitude, meaning that just as today, the land is bathed in round-the-clock darkness during winter and 24/7 light in the summer.
Gold in trees leads to hidden deposits BBC - October 22, 2013
Money might not grow on trees, but scientists have confirmed that gold is found in the leaves of some plants. Researchers from Australia say that the presence of the particles in a eucalyptus tree's foliage indicates that deposits are buried many metres below. They believe that the discovery offers a new way to locate the sought-after metal in difficult-to-reach locations.
Study: Just 227 tree species dominate Amazon landscape BBC - October 17, 2013
Despite being home to about 16,000 tree species, just 227 "hyperdominant" species account for half of Amazonia's total trees, a study suggests.
Poland's Mysterious Crooked Forest Discovery - June 29, 2011
In a tiny corner of western Poland a forest of about 400 pine trees grow with a 90 degree bend at the base of their trunks - all bent northward. Surrounded by a larger forest of straight growing pine trees this collection of curved trees, or "Crooked Forest," is a mystery. Planted around 1930, the trees managed to grow for seven to 10 years before getting held down, in what is understood to have been human mechanical intervention. Though why exactly the original tree farmers wanted so many crooked trees is unknown.
Seeing the forest through the trees PhysOrg - February 21, 2011
University of Arizona researcher Brian Enquist and his colleagues have discovered the secret of patterns within individual trees that can be used to describe the structure and functioning of the world's forests. Imagine you are walking through a forest. All around you are trees of different species, age, size and height. It looks pretty random, right? Wrong. Brian Enquist of the department of evolutionary biology at the University of Arizona and his team have discovered a secret in the trees: Hidden among and within the architecture of the branches are fundamental rules that link the size, shape, age and in fact everything about a single tree to all the trees in a forest. This rule or code reoccurs as the tree grows, creating a fractal - a repeating pattern - like a spiral of daughter branches emanating from the mother branch or tree trunk. These rules hold true across species, so the ratios of lengths and radii of a mother branch to daughter branches are the same for almost all trees.
Giant Sequoias Yield Longest Fire History from Tree Rings Science Daily - April 21, 2010
A 3,000-year record from 52 of the world's oldest trees shows that California's western Sierra Nevada was droughty and often fiery from 800 to 1300, according to new research. Scientists reconstructed the region's history of fire by dating fire scars on ancient giant sequoia trees, Sequoiadendron giganteum, in the Giant Forest of Sequoia National Park. Individual giant sequoias can live more than 3,000 years and are considered the world's largest trees by volume.
This Tree's a Lady! Live Science - February 4, 2010
Scientists have discovered the female sex hormone progesterone in a walnut tree, shaking up what's known about the different between plants and animals. Until now, scientists thought that only animals could make progesterone. A steroid hormone secreted by the ovaries, progesterone prepares the uterus for pregnancy and maintains pregnancy. A synthetic version, progestin, is used in birth control pills and other medications.
Trees evolved camouflage defense against long extinct predator: First evidence of camouflage defense in plants PhysOrg - July 22, 2009
Many animal species such as snakes, insects and fish have evolved camouflage defenses to deter attack from their predators. However research published in New Phytologist has discovered that trees in New Zealand have evolved a similar defense to protect themselves from extinct giant birds, providing the first evidence of this strategy in plant life.
Ancient trees recorded in mines BBC - September 9, 2008
Spectacular fossil forests have been found in the coal mines of Illinois by a US-UK team of researchers. The group reported one discovery last year, but has since identified a further five examples. The ancient vegetation - now turned to rock - is visible in the ceilings of mines covering thousands of hectares. These were among the first forests to evolve on the planet.
"Methuselah" Tree Grew From 2,000-Year-Old Seed National Geographic - June 12, 2008
The oldest-sprouted seed in the world is a 2,000-year-old plant from Jerusalem, a new study confirms. "Methuselah," a 4-foot-tall (1.2-meter-tall) ancestor of the modern date palm, is being grown at a protected laboratory in the Israeli capital.
Study: Tree Leaves Have Built-In Thermostat Live Science - June 11, 2008
Although Native Americans used to burn forests to farm, such practices were nowhere close to damaging "as the drastic deforestation that came with the Europeans," Roddick said. The colonists, like the Native Americans, cleared forests to farm, and felled trees for their timbers as well. "White pine was used a lot for shipbuilding," he explained. As deforestation leveled native trees, so too have infestations of disease and insects decimated forests.
Oldest Living Tree Found in Sweden - 9,550 years old National Geographic - April 14, 2008
The world's oldest known living tree, a conifer that first took root at the end of the last Ice Age, has been discovered in Sweden, researchers say. The visible portion of the 13-foot-tall (4-meter-tall) "Christmas tree" isn't ancient, but its root system has been growing for 9,550 years, according to a team led by Leif Kullman, professor at UmeŚ University's department of ecology and environmental science in Sweden. Discovered in 2004, the lone Norway spruce of the species traditionally used to decorate European homes during Christmas represents the planet's longest-lived identified plant, Kullman said. The researchers found the shrubby mountain survivor at an altitude of 2,985 feet (910 meters) in Dalarna Province. The spruce's stems or trunks have a lifespan of around 600 years, "but as soon as a stem dies, a new one emerges from the same root stock.
Texas: Mysterious 'Fairyland' Spider Web Found Live Science - August 30, 2007
Entomologists are debating the origin and rarity of a sprawling spider web that blankets several trees, shrubs and the ground along a 200-yard stretch of trail in a North Texas park. Officials at Lake Tawakoni State Park say the massive mosquito trap is a big attraction for some visitors, while others won't go anywhere near it.
Paleontology: Tree Fossils
Tree worship (dendrolatry) refers to the tendency of many societies throughout history to worship or otherwise mythologize trees. Trees have played an important role in many of the world's mythologies and religions, and have been given deep and sacred meanings throughout the ages. Human beings, observing the growth and death of trees, the elasticity of their branches, the sensitivity and the annual decay and revival of their foliage, see them as powerful symbols of growth, decay and resurrection. The most ancient cross-cultural symbolic representation of the universe's construction is the world tree.
The image of the Tree of Life is also a favorite in many mythologies. Various forms of trees of life also appear in folklore, culture and fiction, often relating to immortality or fertility. These often hold cultural and religious significance to the peoples for whom they appear. For them, it may also strongly be connected with the motif of the world tree.
Other examples of trees featured in mythology are the Banyan and the Peepal trees in Hinduism, and the modern tradition of the Christmas Tree in Germanic mythology, the Tree of Knowledge of Judaism and Christianity, and the Bodhi tree in Buddhism.
In folk religion and folklore, trees are often said to be the homes of tree spirits. Historical Druidism as well as Germanic paganism appear to have involved cultic practice in sacred groves, especially the oak. The term druid itself possibly derives from the Celtic word for oak.
Trees are a necessary attribute of the archetypical locus amoenus in all cultures. Already the Egyptian Book of the Dead mentions sycomores as part of the scenery where the soul of the deceased finds blissful repose.
The evidence for tree-worship is almost unmanageably large, and since comparative studies do not as yet permit a concise and conclusive synopsis of the subject, this article will confine itself to some of the more prominent characteristics.
On an emotional level, trees are often calming and 'speak' to people.
The Circle of Life.
Reality is a consciousness hologram created by electromagnetic energy.
Trees were created at the beginning of the Hologram.
Trees hold the Illusion in place.
Trees connect day and night and above and below.
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