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A pine is any conifer in the genus ''Pinus'' () of the family Pinaceae. ''Pinus'' is the sole genus in the subfamily Pinoideae. The Plant List compiled by the Royal Botanic Gardens, Kew and Missouri Botanical Garden accepts 126 species names of pines as current, together with 35 unresolved species and many more synonyms. Pine may also refer to the lumber derived from pine trees; pine is one of the more extensively used types of wood used as lumber.

Etymology

The modern English name "pine" derives from Latin ''pinus'', which some have traced to the Indo-European base ''*pīt-'' ‘resin’ (source of English ''pituitary''). Before the 19th century, pines were often referred to as firs (from Old Norse ''fura'', by way of Middle English ''firre''). In some European languages, Germanic cognates of the Old Norse name are still in use for pines—in Danish ''fyr'', in Norwegian ''fura/fure/furu'', Swedish ''fura/furu'', Dutch ''vuren'', and German ''Föhre''—but in modern English, ''fir'' is now restricted to fir (''Abies'') and Douglas fir (''Pseudotsuga'').

Description

Pine trees are evergreen, coniferous resinous trees (or, rarely, shrubs) growing tall, with the majority of species reaching tall. The smallest are Siberian dwarf pine and Potosi pinyon, and the tallest is an tall ponderosa pine located in southern Oregon's Rogue River-Siskiyou National Forest. Pines are long lived and typically reach ages of 100–1,000 years, some even more. The longest-lived is the Great Basin bristlecone pine, ''Pinus longaeva''. One individual of this species, dubbed "Methuselah", is one of the world's oldest living organisms at around 4,600 years old. This tree can be found in the White Mountains of California. An older tree, now cut down, was dated at 4,900 years old. It was discovered in a grove beneath Wheeler Peak and it is now known as "Prometheus" after the Greek immortal. The spiral growth of branches, needles, and cone scales may be arranged in Fibonacci number ratios. The new spring shoots are sometimes called "candles"; they are covered in brown or whitish bud scales and point upward at first, then later turn green and spread outward. These "candles" offer foresters a means to evaluate fertility of the soil and vigour of the trees.


Bark


The bark of most pines is thick and scaly, but some species have thin, flaky bark. The branches are produced in regular "pseudo whorls", actually a very tight spiral but appearing like a ring of branches arising from the same point. Many pines are uninodal, producing just one such whorl of branches each year, from buds at the tip of the year's new shoot, but others are multinodal, producing two or more whorls of branches per year.


Foliage


Pines have four types of leaf: * Seed leaves (cotyledons) on seedlings are borne in a whorl of 4–24. * Juvenile leaves, which follow immediately on seedlings and young plants, are 2–6 cm long, single, green or often blue-green, and arranged spirally on the shoot. These are produced for six months to five years, rarely longer. * Scale leaves, similar to bud scales, are small, brown and not photosynthetic, and arranged spirally like the juvenile leaves. * Needles, the adult leaves, are green (photosynthetic) and bundled in clusters called fascicles. The needles can number from one to seven per fascicle, but generally number from two to five. Each fascicle is produced from a small bud on a dwarf shoot in the axil of a scale leaf. These bud scales often remain on the fascicle as a basal sheath. The needles persist for 1.5–40 years, depending on species. If a shoot's growing tip is damaged (e.g. eaten by an animal), the needle fascicles just below the damage will generate a stem-producing bud, which can then replace the lost growth tip.

Cones

Pines are mostly monoecious, having the male and female cones on the same tree, though a few species are sub-dioecious, with individuals predominantly, but not wholly, single-sex. The male cones are small, typically 1–5 cm long, and only present for a short period (usually in spring, though autumn in a few pines), falling as soon as they have shed their pollen. The female cones take 1.5–3 years (depending on species) to mature after pollination, with actual fertilization delayed one year. At maturity the female cones are 3–60 cm long. Each cone has numerous spirally arranged scales, with two seeds on each fertile scale; the scales at the base and tip of the cone are small and sterile, without seeds. The seeds are mostly small and winged, and are anemophilous (wind-dispersed), but some are larger and have only a vestigial wing, and are bird-dispersed (see below). Female cones are woody and sometimes armed to protect developing seeds from foragers. At maturity, the cones usually open to release the seeds. In some of the bird-dispersed species, for example whitebark pine,), the seeds are only released by the bird breaking the cones open. In others, the seeds are stored in closed cones for many years until an environmental cue triggers the cones to open, releasing the seeds. This is called serotiny. The most common form of serotiny is pyriscence, in which a resin binds the cones shut until melted by a forest fire, for example in ''Pinus rigida''.

Evolutionary history

Conifers evolved about 300 million years ago, and pines perhaps 200 million years ago. ''Pinus'' is the largest genus of the Pinaceae, the pine family, which is the oldest and largest conifer family. It dates back to 206 million years ago. Based on recent Transcriptome analysis, ''Pinus'' is most closely related to the genus ''Cathaya'', which in turn is closely related to spruces. These genera, with firs and larches, form the pinoid clade of the Pinaceae. The oldest verified fossil of the genus is ''Pinus yorkshirensis'' from the Hauterivian-Barremian boundary (131-129 Ma) in the Speeton Clay, England. The evolutionary history of the genus ''Pinus'' has been complicated by hybridization. Pines are prone to inter-specific breeding. Wind pollination, long life spans, overlapping generations, large population size, and weak reproductive isolation make breeding across species more likely. As the pines have diversified, gene transfer between different species has created a complex history of genetic relatedness.

Taxonomy, nomenclature and codification

Pines are gymnosperms. The genus is divided into two subgenera based on the number of fibrovascular bundles in the needle. The subgenera can be distinguished by cone, seed, and leaf characters: *''Pinus'' subg. ''Pinus'', the yellow, or hard pine group, generally with harder wood and two or three needles per fascicle. The subgenus is also named ''diploxylon'', on account of its two fibrovascular bundles. *''Pinus'' subg. ''Strobus'', the white, or soft pine group. Its members usually have softer wood and five needles per fascicle. The subgenus is also named ''haploxylon'', on account of its one fibrovascular bundle. Each subgenus is further divided into sections and subsections. Many of the smaller groups of ''Pinus'' are composed of closely related species with recent divergence and history of hybridization. This results in low morphological and genetic differences. This, coupled with low sampling and underdeveloped genetic techniques, has made taxonomy difficult to determine. Recent research using large genetic datasets has clarified these relationships into the groupings we recognize today.

Distribution

Pines are native to the Northern Hemisphere, and in a few parts of the tropics in the Southern Hemisphere. Most regions of the Northern Hemisphere (see List of pines by region) host some native species of pines. One species (Sumatran pine) crosses the equator in Sumatra to 2°S. In North America, various species occur in regions at latitudes from as far north as 66°N to as far south as 12°N. Pines may be found in a very large variety of environments, ranging from semi-arid desert to rainforests, from sea level up to , from the coldest to the hottest environments on Earth. They often occur in mountainous areas with favorable soils and at least some water. Various species have been introduced to temperate and subtropical regions of both hemispheres, where they are grown as timber or cultivated as ornamental plants in parks and gardens. A number of such introduced species have become naturalized, and some species are considered invasive in some areas and threaten native ecosystems.

Ecology

Pines grow well in acid soils, some also on calcareous soils; most require good soil drainage, preferring sandy soils, but a few (e.g. lodgepole pine) can tolerate poorly drained wet soils. A few are able to sprout after forest fires (e.g. Canary Island pine). Some species of pines (e.g. bishop pine) need fire to regenerate, and their populations slowly decline under fire suppression regimens. Pine trees are beneficial to the environment, they can remove carbon dioxide from the atmosphere. Although several studies have indicated that after the establishment of pine plantations in grasslands, there is an alteration of carbon pools including a decrease of the soil organic carbon pool. Several species are adapted to extreme conditions imposed by elevation and latitude (e.g. Siberian dwarf pine, mountain pine, whitebark pine, and the bristlecone pines). The pinyon pines and a number of others, notably Turkish pine and gray pine, are particularly well adapted to growth in hot, dry semidesert climates. The seeds are commonly eaten by birds, such as grouse, crossbills, jays, nuthatches, siskins, and woodpeckers, and by squirrels. Some birds, notably the spotted nutcracker, Clark's nutcracker, and pinyon jay, are of importance in distributing pine seeds to new areas. Pine needles are sometimes eaten by some Lepidoptera (butterfly and moth) species (see list of Lepidoptera that feed on pines), the Symphytan species pine sawfly, and goats. Pine pollen may play an important role in the functioning of detrital food webs. Nutrients from pollen aid detritivores in development, growth, and maturation, and may enable fungi to decompose nutritionally scarce litter. Pine pollen is also involved in moving plant matter between terrestrial and aquatic ecosystems.

Uses




Lumber and construction


Pines are among the most commercially important tree species valued for their timber and wood pulp throughout the world. In temperate and tropical regions, they are fast-growing softwoods that grow in relatively dense stands, their acidic decaying needles inhibiting the sprouting of competing hardwoods. Commercial pines are grown in plantations for timber that is denser and therefore more durable than spruce (''Picea''). Pine wood is widely used in high-value carpentry items such as furniture, window frames, panelling, floors, and roofing, and the resin of some species is an important source of turpentine. Because pines have no insect- or decay-resistant qualities after logging, untreated they are generally recommended for construction purposes as indoor use only (indoor drywall framing, for example). For outside use, pine needs to be treated with copper azole, chromated copper arsenate or other suitable chemical preservative.


Ornamental uses


Many pine species make attractive ornamental plantings for parks and larger gardens with a variety of dwarf cultivars being suitable for smaller spaces. Pines are also commercially grown and harvested for Christmas trees. Pine cones, the largest and most durable of all conifer cones, are craft favorites. Pine boughs, appreciated especially in wintertime for their pleasant smell and greenery, are popularly cut for decorations. Pine needles are also used for making decorative articles such as baskets, trays, pots, etc., and during the U.S. Civil War, the needles of the longleaf pine "Georgia pine" were widely employed in this. This originally Native American skill is now being replicated across the world. Pine needle handicrafts are made in the US, Canada, Mexico, Nicaragua, and India. Pine needles are also versatile and have been used by Latvian designer Tamara Orjola to create different biodegradable products including paper, furniture, textiles and dye.


Wildlife


Pine needles serve as food for various Lepidoptera. Several species of pine are attacked by nematodes, causing pine wilt disease, which can kill some quickly. Some of these Lepidoptera species, many of them moths, specialize in feeding on only one or sometimes several species of pine. Beside that many species of birds and mammals shelter in pine habitat or feed on pine nuts.

Farming

When grown for sawing timber, pine plantations can be harvested after 25 years, with some stands being allowed to grow up to 50 (as the wood value increases more quickly as the trees age). Imperfect trees (such as those with bent trunks or forks, smaller trees, or diseased trees) are removed in a "thinning" operation every 5–10 years. Thinning allows the best trees to grow much faster, because it prevents weaker trees from competing for sunlight, water, and nutrients. Young trees removed during thinning are used for pulpwood or are left in the forest, while most older ones are good enough for saw timber. A 30-year-old commercial pine tree grown in good conditions in Arkansas will be about in diameter and about high. After 50 years, the same tree will be about in diameter and high, and its wood will be worth about seven times as much as the 30-year-old tree. This however depends on the region, species and silvicultural techniques. In New Zealand plantations maximum value is reached at around 28 years with height being as high as and diameter and maximum wood production around 35 years (again depending on factors such as site, stocking and genetics). Trees are normally planted 3–4 m apart, or about 1000 per hectare (100,000 per km2).

Food and nutrients

Some species have large seeds, called pine nuts, that are harvested and sold for cooking and baking. They are an essential ingredient of ''pesto alla genovese''. The soft, moist, white inner bark (cambium) beneath the woody outer bark is edible and very high in vitamins A and C. It can be eaten raw in slices as a snack or dried and ground up into a powder for use as an ersatz flour or thickener in stews, soups, and other foods, such as bark bread. Adirondack Indians got their name from the Mohawk Indian word ''atirú:taks'', meaning "tree eaters". A tea made by steeping young, green pine needles in boiling water (known as ''tallstrunt'' in Sweden) is high in vitamins A and C. In eastern Asia, pine and other conifers are accepted among consumers as a beverage product, and used in teas, as well as wine. Pine needles from ''Pinus densiflora'' were found to contain 30.54 mg/g of proanthocyanidins when extracted with hot water. Comparative to ethanol extraction resulting in 30.11 mg/g, simply extracting in hot water is preferable. In traditional Chinese medicine (TCM), pine resin is used for burns, wounds and dermal complaints.


In popular culture


Pines have been a frequently mentioned tree throughout history, including in literature, paintings and other art, and in religious texts.


Literature


Writers of various nationalities and ethnicities have written of pines. Among them, John Muir, Dora Sigerson Shorter, Eugene Field, the Chinese, Theodore Winthrop, and Rev. George Allan D.D.


Art


''Under the Pines, Evening'', Claude_Monet_(1888)_([[Philadelphia_Museum_of_Art).html" style="text-decoration: none;"class="mw-redirect" title="Philadelphia Museum of Art">Claude Monet (1888) ([[Philadelphia Museum of Art)">Philadelphia Museum of Art">Claude Monet (1888) ([[Philadelphia Museum of Art) Pines are often featured in art, whether painting and [[fine art, drawing, photography, or [[folk art.


Religious texts


Pine trees, as well as other conifers, are mentioned in [[Bible|The Bible. In [[Book of Nehemiah|Nehemiah 8:15, the King James Version renders the following translation:
"And that they should publish and proclaim in all their cities, and in Jerusalem, saying, Go forth unto the mount, and fetch olive branches, and ''pine branches'' mphasis added and myrtle branches, and palm branches, and branches of thick trees, to mak
booths
as it is written."
Pines are also mentioned in Isaiah 60:
"13: The glory of Lebanon shall come unto thee, the fir tree, the pine tree, and the box together, to beautify the place of my sanctuary; and I will make the place of my feet glorious."


Chinese culture

The pine is a motif in Chinese art and literature, which sometimes combines painting and poetry in the same work. Some of the main symbolic attributes of pines in Chinese art and literature are longevity and steadfastness: the pine retains its green needles through all the seasons. Sometimes the pine and cypress are paired. At other times the pine, plum, and bamboo are considered as the "Three Friends of Winter".Eberhard, Wolfram (2003 986 (German version 1983), ''A Dictionary of Chinese Symbols: Hidden Symbols in Chinese Life and Thought''. London, New York: Routledge. , ''sub'' "Pine". Many Chinese art works and/or literature (some involving pines) have been done using paper, brush, and Chinese ink: interestingly enough, one of the main ingredients for Chinese ink has been pine soot.

Gallery

File:Large eastern white Pine in Southern Ontario, Canada.jpg|A large eastern white pine (''Pinus strobus'') in Southern Ontario, Canada. File:Big bristlecone pine Pinus longaeva.jpg|Ancient ''Pinus longaeva'', California, USA File:Pinus kesiya Binga.jpg|A Khasi pine in Benguet, Philippines File:Huangshan.jpg|Huangshan pine (''Pinus hwangshanensis''), Anhui, China File:TianguisArtesanalPatzcuaro2016 113.jpg|Pine needle baskets. File:Young female Pinus virginiana cone.jpg|A growing female cone of a Scots pine on a mountain in Perry County, Pennsylvania. File:Prescribed burn in a Pinus nigra stand in Portugal.JPG|A prescribed fire in a European black pine (''Pinus nigra'') woodland, Portugal File:Pinus sylvestris prepared for transport, Hungary.jpg|''Pinus sylvestris'' prepared for transport, Hungary File:Pain floor.jpg|Tongue and groove solid pine flooring File:Tree Types and Barks 004.jpg|''Pinus taeda'' bark File:Chosui Yabu.jpg|Chosui Yabu's inscribed woodcut of “Three Auspicious Friends” (The Three Friends of Winter) in the Brooklyn Museum. The artist was active c. 1830-1864 and the woodcut is dated about 1860. File:Fully grown and fallen fresh female eastern-white pine (pinus strobus).jpg|A fully grown and freshly fallen female pine cone (''Pinus strobus.'') File:Nowe czarnowo-krzywy las.jpeg|Crooked Forest in Nowe Czarnowo, Poland File:Flowering young pine cones.jpg|Flowering young pine cones File:OP 9 The Turpentine Industry (9091242747).jpg|A picture portraying the turpentine industry. File:Rötter - Ystad-2020.jpg|Roots of an old pine in Ystad 2020. File:Forchem Rauma 2.jpg|Forchem tall oil refinery in Rauma, Finland.


See also


* Pine Tree Flag * Pine barrens * Pine-cypress forest * Three Friends of Winter * El Pino (The Pine Tree) * Tree of Peace * List of pines by region


References





Citations





Bibliography


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External links



40 Pine Trees From Around the World
by The Spruce
Key to Pinus
from the Jepson Manual, covers Californian species
Pinus in Flora of North AmericaPinus in the USDA Plants Database
{{Authority control Category:Pinaceae