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[166] Trees are not a taxonomic group but include a variety of plant species that have independently evolved a trunk and branches as a way to tower above other plants to compete for sunlight.

Because of the collaborative nature of WikiTree, members who have documented the genealogy of their family are expected to work on open profiles in conjunction with other members to ensure the information provided is as accurate as possible. Many trees produce it when injured but the main source of the latex used to make natural rubber is the Pará rubber tree (Hevea brasiliensis). They can provide shade and cooling through evapotranspiration, absorb greenhouse gases and pollutants, intercept rainfall, and reduce the risk of flooding. [123], Wood smoke can be used to preserve food. [145], The papery bark of the white birch tree (Betula papyrifera) was used extensively by Native Americans. When Tree is fed up, he'll walk away and tell people that he is "leafing". [85], The flame tree Delonix regia does not rely on fire but shoots its seeds through the air when the two sides of its long pods crack apart explosively on drying.

They are grown for the beauty of their forms, their foliage, flowers, fruit and bark and their siting is of major importance in creating a landscape.

In parts of the world, forests are shrinking as trees are cleared to increase the amount of land available for agriculture. In Norse mythology, Yggdrasil is a central cosmic tree whose roots and branches extend to various worlds.

[46] In tropical regions with a drier savanna climate and insufficient rainfall to support dense forests, the canopy is not closed, and plenty of sunshine reaches the ground which is covered with grass and scrub. In conifers such as fir trees, the branches hang down at an angle to the trunk, enabling them to shed snow. [106], In ecosystems such as mangrove swamps, trees play a role in developing the habitat, since the roots of the mangrove trees reduce the speed of flow of tidal currents and trap water-borne sediment, reducing the water depth and creating suitable conditions for further mangrove colonisation. [73], Leaves are structures specialised for photosynthesis and are arranged on the tree in such a way as to maximise their exposure to light without shading each other. The roots require oxygen to respire and only a few species such as mangroves and the pond cypress (Taxodium ascendens) can live in permanently waterlogged soil.

[88] Nuts may be gathered by animals such as squirrels that cache any not immediately consumed. Light is very limited under their dense cover and there may be little plant life on the forest floor, although fungi may abound. [5] The crown is the spreading top of a tree including the branches and leaves,[29] while the uppermost layer in a forest, formed by the crowns of the trees, is known as the canopy. FREE . [130] The wood of conifers is known as softwood while that of broad-leaved trees is hardwood. The site's goal is to have one profile for every person, whether living or dead. [146] Aspirin was synthesised to replace the sodium salicylate derived from the bark of willow trees (Salix) which had unpleasant side effects. Many towns have initiated tree-planting programmes. The first tree may have been Wattieza, fossils of which have been found in New York State in 2007 dating back to the Middle Devonian (about 385 million years ago).

These brace the tree rather like angle brackets and provide stability, reducing sway in high winds. It is a viscous liquid composed mainly of volatile terpenes and is produced mostly by coniferous trees.

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[167], Trees have a theoretical maximum height of 130 m (430 ft),[168] but the tallest known specimen on earth is believed to be a coast redwood (Sequoia sempervirens) at Redwood National Park, California.

Previously: Ray Bradbury and Mars science fiction authors. Gifts are left at the tree periodically and when the individual dies, their spirit is believed to live on in the tree.

[169] In 2006, it was reported to be 379.1 ft (115.5 m) tall. Originally used to create bouncy balls and for the waterproofing of cloth, natural rubber is now mainly used in tyres for which synthetic materials have proved less durable. [116] A variety of nut oils are extracted by pressing for culinary use; some such as walnut, pistachio and hazelnut oils are prized for their distinctive flavours, but they tend to spoil quickly. This process enables the tree to live in low nitrogen habitats where they would otherwise be unable to thrive. Many seeds such as birch are small and have papery wings to aid dispersal by the wind.

The quinine bark tree (Cinchona officinalis) contains bitter substances to make the bark unpalatable.

As a tree grows, it may produce growth rings as new wood is laid down around the old wood. "It's been wonderful to experience how collaborative genealogy in WikiTree makes all of us better genealogists. They can be grouped informally, often surrounded by plantings of bulbs, laid out in stately avenues or used as specimen trees.

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