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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. In wider definitions, the taller palms, tree ferns, bananas, and bamboos are also trees. 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. Trees tend to be long-lived, some reaching several thousand years old. Trees have been in existence for 370 million years. It is estimated that there are some three 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.

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 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 among 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. Because of their longevity and usefulness, trees have always been revered, with sacred groves in various cultures, and they play a role in many of the world's mythologies.

Tree Media

5,409 media by topicpage 1 of 55
[Title page] [Sarlawh?] with "marginal drawings of gold plants, trees, and animals".
Other patterns for powder boxes; other patterns for patch boxes.
For ye topp or lid of a combe box[sic]; [...]
The lidd of a powder box; the lidd of a patch box. [sic]
For a standish for pen inks & paper wch; allso may sarve for a comb box[sic] [...]
Design of trees; bird in one tree
Toddy gatherers in landscape with palm trees
Ruined abbey among trees
Bogres, province de St. Catherine.
After torrent with oak trees, original by Jacob van Ruisdael.
Die heilige Familie.
Seybo tree.
Aussicht in dem Hof aus einem der Empfangsäale.
The king performing a religious ceremony.
Winged figures kneelling before the sacred tree. (Nimroud) [Calah]
Fugitives crossing a river to a castle.
Felix Bracquemond - [Gros troncs d'arbres disposés régulièrement...]
[Deux gros troncs de charme devant un mur.]
Botanical profile representing the forest trees along the route explored by Lieut. A.W. Whipple, Corps of Topl. Engrs. near the parallel of 35° north latitude, 1853-1854 : from Fort Smith to San Pedro
Utagawa Hiroshige - Kawasaki, Rokugō watashi-bune
Abraham's Oak at Hebron, Palestine
Gramercy Park, west side looking southeast, Manhattan.
Giovanni Battista Piranesi - Ara antica.
Two circular images, trees with a snake climbing one tree and a bird perched on another ; a human figure with two animal-like figures.
An old Oak, in Aloey Forest, Northamptonshire, belonging to the Crown. Ranger, The Earl Euston.
1. Conseil Arabe. 2. Repas Arabe.
Der Morgen.
The king in his chariot and horsemen ascending mountains (Kouyunjik) [Quyunjik].
The invasion of a mountainous country. [Quyunjik]
A battle in a forest. [Quyunjik]
A city taken by assault - Prisoners driven away. [Quyunjik]
Siege of the city. Warriors cutting down palm trees. (Kouyunjik) [Quyunjik]
Warriors ascending a mountain to a besieged city. [Quyunjik]
An Assyrian army passing through a mountainous country. (Kouyunjik) [Quyunjik].
A. Idols and captives from a conquered Nation [Calah]; B. Fisherman in a lake. (Kouyunjik) [Quyunjik]
A battle in a mountainous country. [Quyunjik]
Felix Bracquemond - Les saules des Mottiaux.
Felix Bracquemond - [Rue des Bruyères, à Sèvres.]
Felix Bracquemond - [Croquis fait au Luxembourg.]
Felix Bracquemond - Les saules des Mottiaux.
Felix Bracquemond - Deux études de paysage sur la même planche.
Felix Bracquemond - Les saules des Mottiaux.
Felix Bracquemond - Les saules des Mottiaux.
Felix Bracquemond - Étude de paysage.
Fra Bartolommeo, M. Léon Bonnat, Paris, 499 verso. [St. John in the wilderness.]
Patchin Place, Manhattan.
On Jazîrat Salâmatah, there is a type of fish that can leave the water and climb trees in order to eat the fruit. The illustration shows a man holding one of these fish while two others climb a tree and to more swim in silver - colored water, f. 81
Ligustrum vulgare = Troëne commun. [Common privet]
Suite de la panorama de la baie de Rio de Janeiro [above]; Rond-Point mênagé pour la station ombragée des chevaux des voyageurs; Profil du bloc de granit qui forme la sommité presque nûe du pic; Tronc d'arbre sur lequel l'empereur D. Pedro grava son chiffre, et la date da mois et de l'année de l'achèvement du chemin praticable. Travail tracé et dirigé par lui personnelment [below].
Sonnenuntergang.
Die Wahrsagerin.
Hollændische Hirten.
Dynastie V. Pyramiden von Saqara [.Saqqârah], Grab 16.
Dynastie V. Pyramiden von Giseh [Jîzah], Grab 16.
Felix Bracquemond - Trembles au bord de la Seine.
Crossing the Lower Plateau towards the Colorado River, Grand View Trail, Grand Cañon of Arizona
Neues Reich. Dynastie XVII.  El  Kab [el-Kab], a - d Grab 3; e. f. Grab 7.
Neues Reich. Dynastie XVII.  El  Kab [el-Kab], Grab 3.
Trees for timber; timber transportation
Quarries; trees for timber
Summit of Mt. Hoffman. Sterescope Cards NYPL Collection.
[View of rocks, water and trees.]
Logging views, including men and women near a giant fallen tree.
Dear native land
Felix Bracquemond - Une allée du parc de Saint-Cloud en hiver.
Felix Bracquemond - Une allée du parc de Saint-Cloud en hiver.
Friday got out to the small end of a large limb of the tree, and the bear got about halfway to him.
Pyramid, trees and camels with handlers.
North American Hotel; on the summit of Sierra Nevada. [no. 636].
Summit Sierra Nevada Mountains, California. Sterescope Cards NYPL Collection.
Long Ravine Bridge, C.P.R.R. California. Sterescope Cards NYPL Collection.
Beauties of the Sierra Nevada Mountains, Lake Angeline, California.
Summit of the western ridge of the Sierras, on the Big Tree and Carson Valley Road looking north.
My dear old home
From clouds rest (N.E.) to Cathedral Peaks, in the snow-clad Sierra Nevada Mountians, California.
Fallen Leaf Lake in the Sierra Nevada Mountains, California, U.S.A.
Alexandrie [Alexandria]. 1-4. Vues d'une mosquée ruinée et de plusieurs tours de l'enceinte des arabes; 5. Vue de l'arbre des pélerins et de l'aquéduc; 6.7. Plans d'une maison particulière.
Neues Reich. Dynastie XIX. Theben [Thebes]. Memnonia [Ramesseum]. Tempel Ramses II. Hypostyl. Westwand, rechts von der Thür.
Felix Bracquemond - Paysage, d'après Français.
[Trees and animals of Tabago.], Montanus Arnoldus 1625-1683, cartographer
John Ogilby - [Trees and animals of Porto Rico (Puerto rico.).], Montanus Arnoldus 1625-1683, cartographer
Ptolemaeer. Ptol. IV. Philopator I. Edfu [Idfû]. Grosser Tempel: a. Säulenhalle; b. Aus einem innern Raume; c. Tempel von Dakkeh [el-Dakka].
Aethiopen. Begerauîeh [Begrawiya]. Pyramidengruppe A. Pyr. 14. Norwand, östlicher Theil.
Drawing bull and forest with stags and pigs. (Kouyunjik) [Quyunjik].
At the base of the Grizzly Giant (cir. 106 ft), Mariposa Grove, California., U.S.A.
The Two Brothers, Mariposa Grove. Sterescope Cards NYPL Collection.
The Pioneer's Cabin. Sterescope Cards NYPL Collection.
Keystone State. Sterescope Cards NYPL Collection.
The Two Brothers, Mariposa Grove. Sterescope Cards NYPL Collection.
House over the Stump of the Original Big Tree.
Auger holes through the Original Big Tree showning means by which it was felled.
Section of the Original Big Tree, 92 ft. in circumference.
Section of the Original Big Tree, 92 ft. in circumference.
The Grizzled Giant, 30 feet. in diameter.
The Pioneer's Cabin. Sterescope Cards NYPL Collection.
Section of the Original Big Tree, 92 feet in Circumference.
The Grizzled Giant, 30 ft. in diameter.
The Grizzled Giant, 30 feet in diameter, Mariposa Grove.
Mother of the Forest, 327 feet high, 26 feet in Diameter.
Schuyler Colfax, 73 ft. in circumference.
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