Portal:Trees
The Trees Portal
angiosperm
) treeIn botany, a tree is a perennial plant with an elongated stem, or trunk, usually supporting branches and leaves. 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. In wider definitions, the taller palms, tree ferns, bananas, and bamboos are also trees.
Trees are not a
angiosperms or hardwoods; of the rest, many are gymnosperms
or softwoods. Trees tend to be long-lived, some reaching several thousand years old. Trees evolved around 370 million years ago, and it is estimated that there are around three trillion mature trees in the world currently.
A tree typically has many secondary branches supported clear of the ground by the trunk, which typically contains
woody tissue for strength, and vascular tissue to carry materials from one part of the tree to another. For most trees the trunk 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.
Trees usually reproduce using seeds. Flowers and fruit may be present, but some trees, such as conifers, instead have pollen cones and seed cones. Palms, bananas, and bamboos also produce seeds, but tree ferns produce spores instead.
Trees play a significant role in reducing
mythologies. (Full article...
)
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leaf cutter ants.
microsatellites. It is genetically diverse, indicating gene flow occurs between populations and seeds can be dispersed up to 1 km. The leaves of S. amara are eaten by several species of caterpillar, particularly those in the genus Atteva. Several species of termite and ants live on or around the tree and lianas and epiphytes grow on the tree. (Full article...
)Did you know? -
- ... that veneration of the Amla tree (pictured), in particular on Amalaka Ekadashi, is due to the belief that the god Vishnu resides in and near the tree?
- ... that the future of the tropical tree gall fly, Phytolyma lata?
- ... that the churchyard of All Saints Church, Ulcombe in England contains a yew tree claimed to be more than 2,000 years old?
- ... that seeds of the extinct tree Eucommia eocenica have been found with latex covered fossils?
- ... that the fruits of the Lecythis ampla tree resemble little wooden pots with lids?
- ... that fossilized seeds of the extinct tree Eucommia montana are found from British Columbia to Colorado?
- ... that the Australian tree Agathis atropurpurea is known as the black kauri or the blue kauri because of the colour of its bark?
Selected article -
coniferous trees within the family Cupressaceae, that range in the northern hemisphere. It includes the largest and tallest trees in the world. The trees in the subfamily are amongst the most notable trees in the world and are common ornamental trees. The subfamily reached its peak of dominance during the early Cenozoic. (Full article...
)
General images
The following are images from various tree-related articles on Wikipedia.
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Proportion of forest in protected areas, by region, 2020 (from Forest) -
4000 years oldCypress of Abarqu is the oldest tree in Iran and the second oldest tree in the world. (from List of trees of Iran) -
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Roof trusses made from softwood (from Tree) -
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People trees, by Pooktre (from Tree) -
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Recently stripped cork oak (Quercus suber) (from Tree) -
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The Amazon rainforest alongside the Solimões River, a tropical rainforest. These forests are the most biodiverse and productive ecosystems in the world. (from Forest) -
Spiny forest at Ifaty, Madagascar, featuring various Adansonia (baobab) species, Alluaudia procera (Madagascar ocotillo) and other vegetation (from Forest) -
Common ash (angiosperm) tree (from Tree) -
Form, leaves and reproductive structures of queen sago (Cycas circinalis) (from Tree) -
Even, denseold-growth stand of beech trees (Fagus sylvatica) prepared to be regenerated by their saplings in the understory, in the Brussels part of the Sonian Forest. (from Forest) -
A section ofheartwood (from Tree) -
Wind dispersed seed of elm (Acer) (from Tree) -
Buds, leaves, flowers and fruit of oak (Quercus robur) (from Tree) -
Tallherbaceous monocotyledonous plants such as banana lack secondary growth, but are trees under the broadest definition. (from Tree) -
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Buttress roots of the kapok tree (Ceiba pentandra) (from Tree) -
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Diagram ofconiferous tree showing idealised vertical and horizontal sections. A new layer of wood is added in each growing season, thickening the stem, existing branches and roots. (from Tree) -
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Northern beech (Fagus sylvatica) trunk in autumn (from Tree) -
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TheGeneral Sherman Tree, thought to be the world's largest by volume (from Tree) -
Palms and cycads as they might have appeared in the middleTertiary (from Tree) -
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CrackedAesculus tree seed (from Tree) -
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Forest in the Scottish Highlands (from Forest) -
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Share of land that is covered by forest (from Forest) -
lycophyte tree (from Tree) -
Priest River winding through Whitetail Butte with lots of forestry to the east—these lot patterns have existed since the mid-19th century. The white patches reflect areas with younger, smaller trees, where winter snow cover shows up brightly to the astronauts. Dark green-brown squares are parcels (from Forest) -
Since the 13th century, the Niepołomice Forest in Poland has had special use and protection. In this view from space, different coloration can indicate different functions. (from Forest) -
The Daintree Rainforest (from Tree) -
A youngred pine (Pinus resinosa) with spread of roots visible, as a result of soil erosion (from Tree) -
Proportion and distribution of global forest area by climatic domain, 2020 (from Forest) -
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Olive trees in Pakistan (from Trees of Pakistan) -
Conifers in the Swabian alps (from Tree) -
Share of forest area in total land area, top countries (2021) (from Forest) -
World production of selected forest products (from Forest) -
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Rowan tree in Wicklow, Ireland (from List of trees of Great Britain and Ireland) -
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Buds, leaves and reproductive structures of white fir (Abies alba) (from Tree) -
Neem tree at Sant Nenuram Ashram (from Trees of Pakistan) -
Selling firewood at a market (from Tree) -
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