Tree

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Tree
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For other uses, see Tree (disambiguation).
The coniferous Coast Redwood, the tallest tree species on earth.
The coniferous Coast Redwood, the tallest tree species on earth.
Trunk base of a Coast Redwood tree in Jedediah Smith Redwoods State Park: Simpson Reed Discovery Trail, near Crecent City, California
Trunk base of a Coast Redwood tree in Jedediah Smith Redwoods State Park: Simpson Reed Discovery Trail, near Crecent City, California

A tree is a large perennial woody plant, larger than a shrub. It is sometimes defined as a woody plant that attains diameter of 10 cm (30 cm girth) or more at breast height (130 cm above ground).[1] However, there is no set agreement regarding minimum size, the term generally applies to plants that grow to at least 5-6 meters (15-20 ft) high at maturity[citation needed] and having secondary branches supported on a main stem or stems, called a trunk. Most trees exhibit clear apical dominance, though this is not always the case.[2] Compared with most other plants, trees are long-lived, some of them getting to be several thousand years old and growing to up to 115 meters (375 ft) high.

Trees are an important component of the natural landscape due to their prevention of erosion and the provision of a specific weather-sheltered ecosystem in and under their foliage. Trees have also been found to play an important role in producing oxygen[citation needed] and reducing carbon dioxide in the atmosphere, as well as moderating ground temperatures. They are also significant elements in landscaping and agriculture, both for their aesthetic appeal and their orchard crops (such as apples). Wood from trees is a common building material. Trees also play an intimate role in many of the world's mythologies (see trees in mythology).
Contents
[hide]

* 1 Classification
* 2 Morphology
* 3 Champion trees
o 3.1 Tallest trees
o 3.2 Stoutest trees
o 3.3 Largest trees
o 3.4 Oldest trees
* 4 Trees in culture
* 5 Major tree genera
o 5.1 Flowering plants (Magnoliophyta; angiosperms)
+ 5.1.1 Dicotyledons (Magnoliopsida; broadleaf or hardwood trees)
+ 5.1.2 Monocotyledons (Liliopsida)
o 5.2 Conifers (Pinophyta; softwood trees)
o 5.3 Ginkgos (Ginkgophyta)
o 5.4 Cycads (Cycadophyta)
o 5.5 Ferns (Pterophyta)
o 5.6 Fossil Trees
* 6 See also
* 7 References
* 8 Bibliography
* 9 External links

Classification
An oak tree in Denmark
An oak tree in Denmark
A Sweet Chestnut tree in Ticino, Switzerland
A Sweet Chestnut tree in Ticino, Switzerland

A tree is a plant form that occurs in many different orders and families of plants. Trees show a wide variety of growth forms, leaf type and shape, bark characteristics, and reproductive organs.

The earliest trees were tree ferns and horsetails, which grew in vast forests in the Carboniferous Period; tree ferns still survive, but the only surviving horsetails are not of tree form. Later, in the Triassic Period, conifers, ginkgos, cycads and other gymnosperms appeared, and subsequently flowering plants in the Cretaceous Period. Most species of trees today are flowering plants (Angiosperms) and conifers. The listing below gives examples of many well-known trees and how they are typically classified.

A small group of trees growing together is called a grove or copse, and a landscape covered by a dense growth of trees is called a forest. Several biotopes are defined largely by the trees that inhabit them; examples are rainforest and taiga (see ecozones). A landscape of trees scattered or spaced across grassland (usually grazed or burned over periodically) is called a savanna.

Morphology
Leaves are an important feature of trees. These are Beech leaves.
Leaves are an important feature of trees. These are Beech leaves.
Tree roots anchor the structure and provide water and nutrients. The ground has eroded away around the roots of this young Pine tree.
Tree roots anchor the structure and provide water and nutrients. The ground has eroded away around the roots of this young Pine tree.

The basic parts of a tree are the roots, trunk(s), branches, twigs and leaves. Tree stems consist mainly of support and transport tissues (xylem and phloem). Wood consists of xylem cells, and bark is made of phloem and other tissues external to the vascular cambium. Trees may be broadly grouped into exogenous and endogenous trees according to the way in which their stem diameter increases. Exogenous trees, which comprise the great majority of modern trees (all conifers, and all broadleaf trees), grow by the addition of new wood outwards, immediately under the bark. Endogenous trees, mainly in the monocotyledons (e.g., palms), grow by addition of new material inwards.

As an exogenous tree grows, it creates growth rings. Also known as annual rings, each set of light/dark rings is equivalent to one year of growth in a small number of mostly temperate species. For the vast majority of tree species growth rings do not correspond to annual intervals and several may be layed down in a single year, or there may be intervals of several years between additions while in some tropical regions with constant year-round climate growth is continuous and distinct rings are not formed at all. In temperate climates, these rings are commonly visible due to changes in the rate of growth with temperature variation over an annual cycle. In temperate species these rings can be counted to determine the age of the tree, and used to date cores or even wood taken from trees in the past, a practice is known as the science of dendrochronology. Very few, if any, tropical trees can be accurately aged in this manner. Age determination is also impossible in endogenous trees.

The roots of a tree are generally embedded in earth, providing anchorage for the above-ground biomass and absorbing water and nutrients from the soil. It should be noted, however, that while ground nutrients are essential to a tree's growth the majority of its biomass comes from carbon dioxide absorbed from the atmosphere (see photosynthesis). Above ground, the trunk gives height to the leaf-bearing branches, aiding in competition with other plant species for sunlight. In many trees, the arrangement of the branches optimizes exposure of the leaves to sunlight.

Not all trees have all the plant organs or parts mentioned above. For example, most palm trees are not branched, the saguaro cactus of North America has no functional leaves, tree ferns do not produce bark, etc. Based on their general shape and size, all of these are nonetheless generally regarded as trees. Indeed, sometimes size is the more important consideration. A plant form that is similar to a tree, but generally having smaller, multiple trunks and/or branches that arise near the ground, is called a shrub. However, no sharp differentiation between shrubs and trees is possible. Given their small size, bonsai plants would not technically be 'trees', but one should not confuse reference to the form of a species with the size or shape of individual specimens. A spruce seedling does not fit the definition of a tree, but all spruces are trees.

Champion trees

The world's champion trees can be considered on several factors; height, trunk diameter or girth, total size, and age. It is significant that in each case, the top position is always held by a conifer, though a different species in each case; in most measures, the second to fourth places are also held by conifers.

Tallest trees

The heights of the tallest trees in the world have been the subject of considerable dispute and much (often wild) exaggeration. Modern verified measurement with laser rangefinders combined with tape drop measurements made by tree climbers, carried out by the U.S. Eastern Native Tree Society has shown that most older measuring methods and measurements are unreliable, often producing exaggerations of 5% to 15% above the real height. Historical claims of trees of 117 meters (384 ft), 130 meters (427 ft), and even 150 meters (492 ft), are now largely disregarded as unreliable, fantasy or outright fraud. The following are now accepted as the top five tallest reliably measured species:

1. Coast Redwood Sequoia sempervirens: 115.55 m (379.1 ft), Redwood National Park, California, United States[3]
2. Coast Douglas-fir Pseudotsuga menziesii: 99.4 m (326.1 ft), Brummit Creek, Coos County, Oregon, United States[4]
3. Australian Mountain-ash Eucalyptus regnans: 97.0 m (318.2 ft), Styx Valley, Tasmania, Australia[5]
4. Sitka Spruce Picea sitchensis: 96.7 m (317.3 ft), Prairie Creek Redwoods State Park, California, United States[6]
5. Giant Sequoia Sequoiadendron giganteum: 94.9 m (311.4 ft), Redwood Mountain Grove, Kings Canyon National Park, California, United States[7]

A view of a tree from below; this may exaggerate apparent height
A view of a tree from below; this may exaggerate apparent height

More about the coast redwood that is the tallest tree in the world.

Stoutest trees

The girth (circumference) of a tree is much easier to measure than the height, as it is a simple matter of stretching a tape round the trunk, and pulling it taut to find the circumference. Despite this, UK tree author Alan Mitchell made the following comment about measurements of yew trees in the British Isles:

"The aberrations of past measurements of yews are beyond belief. For example, the tree at Tisbury has a well-defined, clean, if irregular bole at least 1.5 m long. It has been found to have a girth which has dilated and shrunk in the following way: 11.28 m (1834 Loudon), 9.3 m (1892 Lowe), 10.67 m (1903 Elwes and Henry), 9.0 m (1924 E. Swanton), 9.45 m (1959 Mitchell) .... Earlier measurements have therefore been omitted".[citation needed]

As a general standard, tree girth is taken at 'breast height' (gbh); this is defined differently in different situations, with most foresters measuring girth at 1.3 meters (51 in) above ground, while ornamental tree measurers usually measure at 1.5 meters (59 in) above ground; in most cases this makes little difference to the measured girth. In the United States, measurements are mostly done at a height of 1.3 meters (51 in), while in the United Kingdom this is mostly done at 1.5 meters (59 in). On sloping ground, the "above ground" reference point is usually taken as the highest point on the ground touching the trunk, but some use the average between the highest and lowest points of ground. Some of the inflated old measurements may have been taken at ground level. Some past exaggerated measurements also result from measuring the complete next-to-bark measurement, pushing the tape in and out over every crevice and buttress.

Modern trends are to cite the tree's diameter rather than the circumference; this is obtained by dividing the measured circumference by π; it assumes the trunk is circular in cross-section (an oval or irregular cross-section would result in a mean diameter slightly greater than the assumed circle). This is cited as dbh (diameter at breast height) in tree literature.

A further problem with measuring baobabs Adansonia is that these trees store large amounts of water in the very soft wood in their trunks. This leads to marked variation in their girth over the year, swelling to a maximum at the end of the rainy season, minimum at the end of the dry season. Although baobabs have some of the highest girth measurements of any trees, no accurate measurements are currently available, but probably do not exceed 10-11 meter (33–36 ft) diameter.

An addition problem lies in cases where multiple trunks (whether from an individual tree or multiple trees) grow together. A good example of the difficulty of such cases is the Árbol del Tule, an 11.42 meter (37.5 ft) diameter Montezuma Cypress Taxodium mucronatum in Oaxaca, Mexico. Whether or not it is comprised of multiple trunks has long been a source of controversy. It is now known to be genetically a single organism (Dorado et al, 1996), but whether it is a single trunk or simply fused trunks/branches is not known[1][verification needed]. The Sacred Fig is another notorious example of this. A single tree can have hundreds of trunks, leading to diameter measurements of hundreds of meters[2].

The stoutest single-trunk species in diameter, excluding baobabs, are:

1. Kauri Agatha australis: 16.41 metres (54 feet) Te Matua Ngahere, Waipoua Forest of Northland Region, New Zealand
2. Jequitibá Cariniana excelsa Casar.: 10.5 m (34.4 ft) (http://www.cr.nps.gov/history/online_books/science/hartesveldt/chap2.htm)Template:Verify sourcedate
3. Giant Sequoia Sequoiadendron giganteum: 8.85 m (29 ft), General Grant tree, Grant Grove, California, United States[8]
4. Coast Redwood Sequoia sempervirens: 7.44 m (24.4 ft), Prairie Creek Redwoods State Park, California, United States [citation needed]
5. Kauri Agathis australis: 7.25 m (23.8 ft) , Mercury Bay, New Zealand[9]
6. Eucalyptus obliqua: 6.72 m (22 ft) , Reynolds Falls Nature Reserve, Tasmania, Australia[10] (E. regnans has similarly large diameters)
7. Western Redcedar: Thuja plicata, 5.94 m (19.5 ft), Lake Quinault, Washington (Van Pelt, 2001)

Charles Darwin reported finding Fitzroya cupressoides with trunk circumferences of up to 40 meters (130 ft)[3], implying a diameter of about 12 meters (40 ft), but this may be an anomaly as the largest known measurements are about 4.5 meters (15 ft).[4]

Largest trees

The largest trees in total volume are those which are both tall and of large diameter, and in particular, which hold a large diameter high up the trunk. Measurement is very complex, particularly if branch volume is to be included as well as the trunk volume, so measurements have only been made for a small number of trees, and generally only for the trunk. No attempt has ever been made to include root volume.

The top four species measured[11] so far are:

1. Giant Sequoia Sequoiadendron giganteum: 1,489 m³ (55,040 cu ft), General Sherman[11]
2. Coast Redwood Sequoia sempervirens: 1,045 m³ (36,890 cu ft), Del Norte Titan tree[11]
3. Western Redcedar Thuja plicata: 500 m³ (17,650 cu ft ), Quinault Lake Redcedar[11]
4. Kauri Agathis australis: circa 400 m³ (15,000 cu ft), Tane Mahuta tree[11] (total volume, including branches, 516.7 m³/18,247 cu ft)[11]

However, the Alerce Fitzroya cupressoides, as yet un-measured, may well slot in at third or fourth place, and Montezuma Cypress Taxodium mucronatum and other giants are also likely to be high in the list. The largest angiosperm tree is a Mountain Ash (Eucalyptus regnans) in Tasmania, known as the 'Two Towers' tree, with a volume of 430 cubic meters (15,185 cu ft).[12]

Oldest trees

The oldest trees are determined by growth rings, which can be seen if the tree is cut down or in cores taken from the edge to the center of the tree. Accurate determination is only possible for trees which produce growth rings, generally those which occur in seasonal climates; trees in uniform non-seasonal tropical climates grow continuously and do not have distinct growth rings. It is also only possible for trees which are solid to the center of the tree; many very old trees become hollow as the dead heartwood decays away. For some of these species, age estimates have been made on the basis of extrapolating current growth rates, but the results are usually little better than guesswork or wild speculation. White (1998)[13] proposes a method of estimating the age of large and veteran trees in the United Kingdom through the correlation between a tree's stem diameter, growth character and age.

The verified oldest measured ages are (Gymnosperm Database):

1. Great Basin Bristlecone Pine Pinus longaeva: 4844 years
2. Alerce Fitzroya cupressoides: 3622 years
3. Giant Sequoia Sequoiadendron giganteum: 3266 years
4. Huon-pine Lagarostrobos franklinii: 2500 years
5. Rocky Mountains Bristlecone Pine Pinus aristata: 2435 years

Other species suspected of reaching exceptional age include European Yew Taxus baccata (probably over 3000 years) and Western Redcedar Thuja plicata.

The oldest verified age for an angiosperm tree is 2293 years for the Sri Maha Bodhi Sacred Fig (Ficus religiosa) planted in 288 BC at Anuradhapura, Sri Lanka; this is also the oldest human-planted tree with a known planting date.

Trees in culture

Main article: Tree (mythology)

The tree has been and still is a popular cultural symbol in most of the world. Common icons are the World tree, for instance Yggdrasil, and the tree of life. The tree often represents nature or the environment itself. A tree can also symbolize investment for humans, and is featured in insignia of some banks, for instance Swedbank.

Major tree genera

Flowering plants (Magnoliophyta; angiosperms)

Dicotyledons (Magnoliopsida; broadleaf or hardwood trees)

* Altingiaceae (Sweetgum family)
o Sweetgum, Liquidambar species
* Anacardiaceae (Cashew family)
o Cashew, Anacardium occidentale
o Mango, Mangifera indica
Eucalyptus niphophila in Namadgi National Park
Eucalyptus niphophila in Namadgi National Park
o Pistachio, Pistacia vera
o Sumac, Rhus species
o Lacquer tree, Toxicodendron verniciflua
* Annonaceae (Custard apple family)
o Cherimoya Annona cherimola
o Custard apple Annona reticulata
o Pawpaw Asimina triloba
o Soursop Annona muricata
* Apocynaceae (Dogbane family)
o Pachypodium Pachypodium species
* Aquifoliaceae (Holly family)
o Holly, Ilex species
* Araliaceae (Ivy family)
o Kalopanax, Kalopanax pictus
Birch tree (foreground) and maple tree (background) in fall.
Birch tree (foreground) and maple tree (background) in fall.
* Betulaceae (Birch family)
o Alder, Alnus species
o Birch, Betula species
o Hornbeam, Carpinus species
o Hazel, Corylus species
* Bignoniaceae (family)
o Catalpa, Catalpa species
* Cactaceae (Cactus family)
o Saguaro, Carnegiea gigantea
* Cannabaceae (Cannabis family)
o Hackberry, Celtis species
* Cornaceae (Dogwood family)
o Dogwood, Cornus species
* Dipterocarpaceae family
o Garjan Dipterocarpus species
o Sal Shorea species
* Ebenaceae (Persimmon family)
o Persimmon, Diospyros species
* Ericaceae (Heath family)
o Arbutus, Arbutus species
* Eucommiaceae (Eucommia family)
o Eucommia Eucommia ulmoides
* Fabaceae (Pea family)
o Acacia, Acacia species
o Honey locust, Gleditsia triacanthos
o Black locust, Robinia pseudoacacia
o Laburnum, Laburnum species
o Pau Brasil, Brazilwood, Caesalpinia echinata
* Fagaceae (Beech family )
o Chestnut, Castanea species
o Beech, Fagus species
o Southern beech, Nothofagus species
o Tanoak, Lithocarpus densiflorus
o Oak, Quercus species
* Fouquieriaceae (Boojum family)
o Boojum, Fouquieria columnaris
* Hamamelidaceae (Witch-hazel family)
o Persian Ironwood, Parrotia persica
* Juglandaceae (Walnut family)
o Walnut, Juglans species
o Hickory, Carya species
o Wingnut, Pterocarya species
* Lauraceae (Laurel family)
o Cinnamon Cinnamomum zeylanicum
o Bay Laurel Laurus nobilis
o Avocado Persea americana
* Lecythidaceae (Paradise nut family)
o Brazil Nut Bertholletia excelsa
* Lythraceae Loosestrife family
o Crape-myrtle Lagerstroemia species
* Magnoliaceae (Magnolia family)
o Tulip tree, Liriodendron species
o Magnolia, Magnolia species
* Malvaceae (Mallow family; including Tiliaceae and Bombacaceae)
Baobab tree in South-Africa.
Baobab tree in South-Africa.
o Baobab, Adansonia species
o Silk-cotton tree, Bombax species
o Bottletrees, Brachychiton species
o Kapok, Ceiba pentandra
o Durian, Durio zibethinus
o Balsa, Ochroma lagopus
o Cacao (cocoa), Theobroma cacao
o Linden (Basswood, Lime), Tilia species
* Meliaceae (Mahogany family)
o Neem, Azadirachta indica
o Bead tree, Melia azedarach
o Mahogany, Swietenia mahagoni
* Moraceae (Mulberry family)
Eucalyptus bridgesiana on Red Hill, Australian Capital Territory.
Eucalyptus bridgesiana on Red Hill, Australian Capital Territory.
o Fig, Ficus species
o Mulberry, Morus species
* Myristicaceae (Nutmeg family)
o Nutmeg, Mysristica fragrans
* Myrtaceae (Myrtle family)
o Eucalyptus, Eucalyptus species
o Myrtle, Myrtus species
o Guava, Psidium guajava
Nyssaceae: a Dove tree in flower
Nyssaceae: a Dove tree in flower
* Nyssaceae (Tupelo family; sometimes included in Cornaceae)
o Tupelo, Nyssa species
o Dove tree, Davidia involucrata
* Oleaceae (Olive family)
o Olive, Olea europaea
o Ash, Fraxinus species
* Paulowniaceae (Paulownia family)
o Foxglove Tree, Paulownia species
* Platanaceae (Plane family)
o Plane, Platanus species
* Rhizophoraceae (Mangrove family)
o Red Mangrove, Rhizophora mangle
* Rosaceae (Rose family)
o Rowans, Whitebeams, Service Trees Sorbus species
o Hawthorn, Crataegus species
o Pear, Pyrus species
o Apple, Malus species
o Almond, Prunus dulcis
o Peach, Prunus persica
o Apricot, Prunus armeniaca
o Plum, Prunus domestica
o Cherry, Prunus species
* Rubiaceae (Bedstraw family)
o Coffee, Coffea species
* Rutaceae (Rue family)
o Citrus, Citrus species
o Cork-tree, Phellodendron species
o Euodia, Tetradium species
* Salicaceae (Willow family)
o Aspen, Populus species
o Poplar, Populus species
o Willow, Salix species

Yellow maple in fall.
Yellow maple in fall.

* Sapindaceae (including Aceraceae, Hippocastanaceae) (Soapberry family)
o Maple, Acer species
o Buckeye, Horse-chestnut, Aesculus species
o Mexican Buckeye, Ungnadia speciosa
o Lychee, Litchi sinensis
o Golden rain tree, Koelreuteria
* Sapotaceae (Sapodilla family)
o Argan, Argania spinosa
o Gutta-percha, Palaquium species
o Tambalacoque, or "dodo tree", Sideroxylon grandiflorum, previously Calvaria major
* Simaroubaceae family
o Tree of heaven, Ailanthus species
* Theaceae (Camellia family)
o Gordonia, Gordonia species
o Stewartia, Stewartia species
* Thymelaeaceae (Thymelaea family)
o Ramin, Gonystylus species
* Ulmaceae (Elm family)
o Elm, Ulmus species
o Zelkova, Zelkova species
* Verbenaceae family
o Teak, Tectona species

Monocotyledons (Liliopsida)
Coconut Palm, a monocotyledonous tree.
Coconut Palm, a monocotyledonous tree.

* Agavaceae (Agave family)
o Cabbage tree, Cordyline australis
o Dragon tree, Dracaena draco
o Joshua tree, Yucca brevifolia
* Arecaceae (Palmae) (Palm family)
o Areca Nut, Areca catechu
o Coconut Cocos nucifera
o Date Palm, Phoenix dactylifera
o Chusan Palm, Trachycarpus fortunei
* Poaceae (grass family)
o Bamboos Poaceae subfamily Bambusoideae
* Note that banana 'trees' are not actually trees; they are not woody nor is the stalk perennial.

Conifers (Pinophyta; softwood trees)

* Araucariaceae (Araucaria family)
o Araucaria, Araucaria species
o Kauri, Agathis species
o Wollemia, Wollemia nobilis
* Cupressaceae (Cypress family)
o Cypress, Cupressus species
o Cypress, Chamaecyparis species
o Juniper, Juniperus species
o Alerce or Patagonian cypress, Fitzroya cupressoides
o Sugi, Cryptomeria japonica
o Coast Redwood, Sequoia sempervirens
o Giant Sequoia, Sequoiadendron giganteum
o Dawn Redwood, Metasequoia glyptostroboides
o Western Redcedar Thuja plicata
o Bald Cypress, Taxodium species
* Pinaceae (Pine family)
o White pine, Pinus species
o Pinyon pine, Pinus species
o Pine, Pinus species
o Spruce, Picea species
o Larch, Larix species
o Douglas-fir, Pseudotsuga species
o Fir, Abies species
o Cedar, Cedrus species
* Podocarpaceae (Yellowwood family)
o African Yellowwood, Afrocarpus falcatus
o Totara, Podocarpus totara
o Miro, Prumnopitys ferruginea
o Kahikatea, Dacrycarpus dacrydioides
o Rimu, Dacrydium cupressinum
* Sciadopityaceae,
o Kusamaki, Sciadopitys species
* Taxaceae (Yew family)
o Yew, Taxus species

Ginkgos (Ginkgophyta)

* Ginkgoaceae (Ginkgo family)
o Ginkgo, Ginkgo biloba

Cycads (Cycadophyta)

* Cycadaceae family
o Ngathu cycad, Cycas angulata
* Zamiaceae family
o Wunu cycad, Lepidozamia hopei

Ferns (Pterophyta)

* Cyatheaceae and Dicksoniaceae families
o Tree ferns, Cyathea, Alsophila, Dicksonia (not a monophyletic group)

Fossil Trees

* Wattieza, the oldest known tree

See also
A moss-covered tree near Orosí, Costa Rica.
A moss-covered tree near Orosí, Costa Rica.
A tree at spring, before the coming of leaves
A tree at spring, before the coming of leaves

* Arboretum
o Pinetum
* Arboriculture (the care of trees)
* Arborsculpture (shaping trees)
* Bonsai
* Christmas tree
* Dendrology (the study of trees)
o Dendrochronology
o Dendroclimatology
* Ecology
o Tree line
* Exploding tree
* Forest
* Forestry
o Deforestation
o Plantation
o Urban forestry
o Woodland management
* Fruit trees
* List of famous trees
* List of garden plants
* Plants
* Prehistoric plants
* Tree climbing
* Trees in mythology
* Trees of the world
o Trees of Britain and Ireland
o Trees of Canada
o Identification of trees of the United States
o List of U.S. state trees
o Trees of the Caribbean Basin
o Trees of Iran
o List of trees native to New Zealand
* Wood
o List of woods
o Xiloteque

References

1. ^ Utkarsh Ghate. "Field Guide to Indian Trees", Text of the Introductory chapter: "Introduction to Common Indian Trees" (RTF). Retrieved on 2007-07-25.
2. ^ Mitchell, A. (1978). Trees of Britain & Northern Europe. Harper Collins. London. ISBN 0-00-219213-6
3. ^ Gymnosperm Database Sequoia sempervirens. Retrieved on 2007-06-10. “Hyperion, Redwood National Park, CA, 115.55 m”
4. ^ Gymnosperm Database Pseudotsuga menziesii. Retrieved on 2007-06-10. “The Brummit Fir: Height 99.4 m, dbh 354 cm, on E. Fork Brummit Creek in Coos County, Oregon; in 1998 (Robert Van Pelt e-mail 21-Apr-1998). This is the tallest known tree in the...”
5. ^ Ten Tallest Trees [of Tasmania]. Tasmanian Giant Trees. Retrieved on 2007-06-10. “Height (m): 97; Diameter (cm): 290; Volume (m3): 164; Species: E.regnans; Tree identification: TT326; Name: Icarus Dream; Location: Andromeda; Year last measured: 2005;”
6. ^ Gymnosperm Database Picea sitchensis. Retrieved on 2007-06-10. “This tree also has a sign nearby proclaiming it to be 'the world's largest spruce.' The tallest two trees on record, 96.7 m and 96.4 m, are in Prairie Creek Redwoods State Park, California...”
7. ^ Gymnosperm Database Sequoiadendron giganteum. Retrieved on 2007-06-10. “The tallest known giant sequoia is a specimen 94.9 m tall, first measured Aug-1998 by Michael Taylor in the Redwood Mountain Grove, California...”
8. ^ Gymnosperm Database Sequoiadendron giganteum. Retrieved on 2007-06-10. “...the General Grant tree in Kings Canyon National Park, CA, which is 885 cm dbh and 81.1 m tall....”
9. ^ The Giant Sequoia of the Sierra Nevada (Chapter 2). United States NATIONAL PARK SERVICE. Retrieved on 2007-06-10. “Agathis australis Salisb. One specimen, now destroyed, at Mercury Bay, New Zealand, measured 23.8 ft in diameter, and the first branch was 80 ft above the ground. Estimates, on unknown basis, put its age at 4000 years.”
10. ^ Tasmania's ten most massive giants. Tasmanian Giant Trees. Retrieved on 2007-06-10. “Height (m): 61; Diameter (cm): 672; Volume (m3): 341; Species: E.obliqua; Tree identification: TT360; Name:-- ; Location: Reynolds Falls Nature Reserve; Year last measured: 2005;”
11. ^ a b c d e f Gymnosperm Database: A Tale of Big Tree Hunting In California. Retrieved on 2007-06-10. “(Sequoiadendron giganteum), is 55,040 cubic feet,...(Sequoia sempervirens) at 36,890 cubic feet...Thuja plicata 17,650 cu ft 500 m3... Agathis australis ca. 15,000 cu ft 400 m3 ...”
12. ^ Tasmania's ten most massive giants. Tasmanian Giant Trees. Retrieved on 2007-06-10. “Height (m): 75; Diameter (cm): 580; Volume (m3): 430; Species: E.regnans; Tree identification: TT38; Name:Two Towers; Location: Jacques Road; Year last measured: 2006;”
13. ^ White, J. (1990). Estimating the Age of Large and Veteran Trees in Britain. Forestry Commission. Edinburgh.

Bibliography

* Pakenham, T. (2002). Remarkable Trees of the World. ISBN 0-297-84300-1
* Pakenham, T. (1996). Meetings with Remarkable Trees. ISBN 0-297-83255-7
* Tudge, C. (2005). The Secret Life of Trees. How They Live and Why They Matter. Allen Lane. London. ISBN 0-713-99698-6

External links
Wikimedia Commons has media related to:
Trees
Look up tree in Wiktionary, the free dictionary.

* International Society of Arboriculture
* Global Trees Campaign (campaigning to save the world's most threatened trees)
* Tree Guide at arborday.org
* Selecting Trees for Your Home
* Grow Your Own Trees
* Oak wood regeneration

Retrieved from "http://en.wikipedia.org/wiki/Tree"

Categories: Semi-protected | All articles with unsourced statements | Articles with unsourced statements since May 2007 | Articles with unsourced statements since August 2007 | Articles with unsourced statements since June 2007 | All pages needing cleanup | Wikipedia articles needing factual verification since June 2007 | Forestry | Trees | Plant morphology
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