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Biography
Redirect|SalixOther usestaxobox|name = Willow|image = Salix alba Morton.jpg|image_caption = Salix alba 'Vitellina-Tristis' Morton Arboretum acc. 58-95*1|regnum = Plant ae|unranked_divisio = Angiosperms |unranked_classis = Eudicots |unranked_ordo = Rosids |ordo = Malpighiales |familia = Salicaceae |tribus = Saliceae cite web |url= http://www.uniprot.org/taxonomy/40685 |title=Genus Salix (willows) |work=Taxonomy |publisher=UniProt |accessdate=2010-02-04|genus = Salix |genus_authority = Carl Linnaeus|L. |subdivision_ranks = Species|subdivision = About 400. See List of Salix species|List of Salix species | Willows , sallows , and osiers form the genus Salix , around 400 speciesMabberley, D.J. 1997. The Plant Book. Cambridge University Press #2: Cambridge. of deciduous tree s and shrub s, found primarily on moist soil s in cold and temperate regions of the Northern Hemisphere . Most species are known as willow, but some narrow-leaved shrub species are called osier , and some broader-leaved species are referred to as sallow (from Old English sealh , related to the Latin word salix , willow). Some willows (particularly arctic and alpine climate|alpine species) are low-growing or creeping shrubs; for example, the dwarf willow ( Salix herbacea ) rarely exceeds Convert|6|cm|in|0|abbr=on in height, though it spreads widely across the ground.
Willows are very cross-fertile, and numerous Hybrid (biology)|hybrid s occur, both naturally and in cultivation. A well-known ornamental plant|ornamental example is the weeping willow ( Salix × sepulcralis ), which is a hybrid of Peking willow ( Salix babylonica ) from China and white willow ( Salix alba ) from Europe .
Description
Willows all have abundant, watery bark , sap which is heavily charged with salicylic acid , soft, usually pliant, tough wood , slender branches, and large, fibrous, often stolon iferous root s. The roots are remarkable for their toughness, size, and tenacity to life, and roots readily grow from aerial parts of the plant.
The leaf|leaves are typically elongated, but may also be round to oval, frequently with a serrated margin. Most species are deciduous ; semi- evergreen willows; coriaceous leaves are rare, e.g. Salix micans and S. australior in the eastern Mediterranean. All the buds are lateral; no absolutely terminal bud is ever formed. The buds are covered by a single scale, enclosing at its base two minute, opposite buds, alternately arranged, with two small, opposite, scale-like leaves. This first pair soon falls, and the later leaves are alternately arranged. The leaves are simple, feather-veined, and typically linear-lanceolate. Usually they are serrate, rounded at base, acute or acuminate. The leaf petiole (botany)|petioles are short, the stipule s often very conspicuous, look like tiny, round leaves and sometimes remain for half the summer. On some species, however, they are small, inconspicuous, and fugacious (soon falling). In color, the leaves show a great variety of greens, ranging from yellowish to bluish.
Flowers
Willows are plant sexuality|dioecious , with male and female flower s appearing as catkin s on different plants; the catkins are produced early in the spring, often before the leaves, or as the new leaves open.
The staminate (male) flowers are without either Calyx (botany)|calyx or Corolla (flower)|corolla ; they consist simply of stamens, varying in number from two to ten, accompanied by a nectariferous gland and inserted on the base of a scale which is itself borne on the rachis of a drooping raceme called a catkin, or ament. This scale is square, entire and very hairy. The anthers are rose-colored in the bud, but orange or purple after the flower opens, they are two-celled and the cells open longitudinally. The filaments are threadlike, usually pale Brown, and often bald.
The pistillate (female) flowers are also without calyx or corolla, and consist of a single ovary accompanied by a small, flat nectar gland and inserted on the base of a scale which is likewise borne on the rachis of a catkin. The ovary is one-celled, the style two-lobed, and the ovules numerous.
Cultivation
Almost all willows take root very readily from cuttings or where broken branches lie on the ground. The few exceptions include the goat willow ( Salix caprea ) and Peachleaf willow ( Salix amygdaloides ). One famous example of such growth from cuttings involves the poet Alexander Pope , who begged a twig from a parcel tied with twigs sent from Spain to Lady Suffolk. This twig was planted and thrived, and legend has it that all of England's weeping willows are descended from this first one.cite web |url= http://www.uab.edu/english/hone/etexts/edb/day-pages/221-aug09.html |title=August 9 |first=William |last=Hone |authorlink=William Hone |work=The Every-Day Book (Electronic Edition) |year=1826 Hone quotes "Martyn", and notes that Martyn in turn cites "the ''St. James's Chronicle , for August, 1801".
Willows are often planted on the borders of streams so their interlacing roots may protect the bank against the action of the water. Frequently, the roots are much larger than the stem which grows from them.
Ecological issues
Willows are used as food plants by the larva e of some Lepidoptera species–see list of Lepidoptera that feed on willows .
A small number of willow species were widely planted in Australia, notably as erosion control measures along watercourses. They are now regarded as invasive weed s, and many Catchment Management Authority|catchment management authorities are removing them to be replaced with native trees.cite web |url= http://www.dse.vic.gov.au/dpi/nreninf.nsf/childdocs/-1C62D26CD3AF6FE44A2568B300051289-8E21A59E53B35BEFCA256BC80005C14F-E1EB709D7DCE1BC9CA256F070003E8D8-FAC3FFA202EA6384CA256BCF000AD522? open |title=Willows along watercourses: managing, removing and replacing |author=Albury/Wodonga Willow Management Working Group |month=December |year=1998 |publisher=Department of Primary Industries, State Government of Victoriacite web |url= http://www.hoadley.net/cremer/willows/docs/WillowInBiodiversity.pdf |title=Introduced willows can become invasive pests in Australia |first=Kurt W. |last=Cremer |year=2003 |format=PDF
Willow roots grow widespread and are very aggressive in seeking out moisture; for this reason, they can become problematic when planted in residential areas, where the roots are notorious for clogging French drain s, Drainage system (agriculture)|drainage systems , weeping tile s, septic system s, storm drain s, and sanitary sewer|sewer system s, particularly older, Pipe (material)#Materials|tile, concrete, or ceramic pipes . Newer, Pipe (material)#Materials|PVC sewer pipes are much less leaky at the joints, and are therefore less susceptible to problems from willow roots; the same is true of water supply piping. http://hort.ufl.edu/trees/SALSPPA.pdf Salix spp. UFL/edu, Weeping Willow Fact Sheet ST-576, Edward F. Gilman and Dennis G. Watson, United States Forest Service " http://www.extension.umn.edu/yardandgarden/YGLNews/YGLN-Oct0103.html#roots Rooting Around: Tree Roots", Dave Hanson, Yard & Garden Line News Volume 5 Number 15, University of Minnesota Extension, October 1, 2003
Uses
Medicine
The leaves and bark of the willow tree have been mentioned in ancient texts from Assyria , Sumer and Ancient Egypt|Egypt cite web|url= http://www.touregypt.net/edwinsmithsurgical.htm|title=The Edwin Smith Papyrus|author=James Breasted (English translation)|accessdate=2007-06-09 as a remedy for aches and fever ,cite web|url= http://www.nobelprizes.com/nobel/medicine/aspirin.html|title=An aspirin a day keeps the doctor at bay: The world's first blockbuster drug is a hundred years old this week|accessdate=2007-06-09 and the Ancient Greece|Ancient Greek physician Hippocrates wrote about its medicinal properties in the fifth century BC. Indigenous peoples of the Americas|Native Americans across the American continent relied on it as a staple of their medical treatments, because willows contain salicin , a substance that chemically resembles aspirin. It temporarily relieves headache, stomachache, and other body pain. Salicin is metabolized into salicylic acid in the human body, which is a precursor of aspirin .cite web|url= http://chestofbooks.com/health/materia-medica-drugs/Pharmacy-Pharmacology-And-Therapeutics/Salicinum-Salicin-Willow.html|title=Materia Medica Pharmacy, Pharmacology and Therapeutics|author=W. Hale White|accessdate=2011-04-02 In 1763, its medicinal properties were observed by the Reverend Edward Stone in England. He notified the Royal Society , who published his findings. The active extract of the bark, called salicin, was isolated to its crystalline form in 1828 by Henri Leroux , a French pharmacist, and Raffaele Piria , an Italian chemist, who then succeeded in separating out the compound in its pure state. In 1897, Felix Hoffmann created a synthetically altered version of salicin (in his case derived from the Spiraea plant), which caused less digestive upset than pure salicylic acid. The new drug, formally acetylsalicylic acid , was named Aspirin by Hoffmann's employer Bayer|Bayer AG . This gave rise to the hugely important class of drugs known as nonsteroidal anti-inflammatory drugs ( NSAID s).
Manufacturing
Some of man's earliest manufactured items may have been made from willow. Basic crafts, such as basket weaving|baskets , fish traps, wattle fence s and wattle and daub house walls, were often woven from osiers (rod-like willow shoots, often grown in coppice s). One of the forms of Welsh coracle traditionally uses willow in the 'lats'. Thin or split willow rods can be woven into wicker , which also has a long history. The relatively pliable willow is less likely to split while being woven than many other woods, and can be bent around sharp corners in basketry. Willow wood is also used in the manufacture of box es, broom s, cricket bat s (grown from certain strains of white willow ), cradle boards, chair s and other furniture, doll s, willow flute|flute s, Flagpole (structure)|pole s, sweat lodge s, toy s, turnery, tool handles, wood veneer|veneer , wand s and whistle s. In addition, tannin , fibre , paper , rope and string can be produced from the wood.
Food
Agriculture : Willows produce a modest amount of nectar that bees can make honey from, and are especially valued as a source of early pollen for bees. Poor people at one time often ate willow catkins that had been cooked to form a mash.Hageneder, Fred (2001). The Heritage of Trees . Edinburgh : Floris. ISBN 0-86315-359-3. p.172
Energy : Willow is grown for biomass or biofuel , in energy forestry systems, as a consequence of its high energy in-energy out ratio, large carbon mitigation potential and fast growth.cite journal
| title =Yield and spatial supply of bioenergy poplar and willow short-rotation coppice in the UK | journal =New Phytologist | volume =178 | issue =2 | pages =358–370 | year =2008 | url = http://www3.interscience.wiley.com/journal/119394739/abstract | format = PDF | accessdate = 2008-10-22 | doi =10.1111/j.1469-8137.2008.02396.x | author =Aylott, Matthew J. | pmid =18331429 | last2 =Casella | first2 =E | last3 =Tubby | first3 =I | last4 =Street | first4 =NR | last5 =Smith | first5 =P | last6 =Taylor | first6 =G Large scale projects to support willow as an energy crop are already at commercial scale in Sweden,cite journal | title =Yield models for commercial willow biomass plantations in Sweden | journal =Biomass and Bioenergy | volume =32 | issue =9 | pages =829–837 | year =2008 | url = http://www.sciencedirect.com/science? _ob=ArticleURL& _udi=B6V22-4S02D5N-1& _user=949127& _rdoc=1& _fmt=& _orig=search& _sort=d& _docanchor=& view=c& _searchStrId=1102089875& _rerunOrigin=google& _acct=C000049117& _version=1& _urlVersion=0& _userid=949127& md5=9a3b80e6d4a86a87261094ef833dee16 | format = PDF | accessdate = 2009-11-20 | doi =10.1016/j.biombioe.2008.01.002 | author =Mola-Yudego, Blas; Aronsson, Pär. and in other countries, others are being developed through initiatives such as the Willow Biomass Project in the US and the Energy Coppice Project in the UK.cite web|url= http://www.forestresearch.gov.uk/srcsite/INFD-5JPEYX |title=Forestresearch.gov.uk |publisher=Forestresearch.gov.uk |date= |accessdate=2011-12-18 Willow may also be grown to produce Charcoal .
Environment : As a plant, willow is used for biofiltration , constructed wetland s, Ecology|ecological wastewater treatment systems, hedge s, land reclamation , landscaping , phytoremediation , streambank stabilisation ( bioengineering ), slope stabilisation, soil erosion control, shelterbelt and windbreak , soil building, soil reclamation, tree bog compost toilet and wildlife habitat .
Art : Willow is used to make Charcoal#Art|charcoal (for drawing) and in living sculpture s. Living sculptures are created from live willow rods planted in the ground and woven into shapes such as domes and tunnels. Willow stems are used to weave baskets and three-dimensional sculptures, such as animals and figures. Willow stems are also used to create garden features, such as decorative panel and obelisks.
Religion : Willow is one of the " Four Species " used ritually during the Judaism|Jewish holiday of Sukkot . In Buddhism , a willow branch is one of the chief attributes of Kwan Yin , the bodhisattva of compassion. Willow is also one of the "nine sacred trees" mentioned in Wicca and witchcraft , with several magic (paranormal)|magic al uses. In the Wiccan Rede , it is described as growing by water, guiding the dead to " The Summerland ", a commonly used term in Wicca to refer to the afterlife . Christian churches in northwestern Europe often used willow branches in place of palms in the ceremonies on Palm Sunday .cite web|url= http://www.churchyear.net/palmsunday.html |title=ChurchYear.net |publisher=ChurchYear.net |date= |accessdate=2011-12-18
Culture : In China, some people carry willow branches with them on the day of their Tomb Sweeping or Qingming Festival . Willow branches are also put up on gates and/or front doors, which they believe help ward off the evil spirits that wander on Qingming. Legend states that on Qingming Festival, the ruler of Hades allows the spirits of the dead to return to earth. Since their presence may not always be welcome, willow branches keep them away.Cite book|title=Social Life of the Chinese|last=Doolittle|first=Justus|publisher=Routledge|year=2002|isbn=978-0-7103-0753-8|origyear=1876 In traditional pictures of the Goddess of Mercy Guanyin , she is often shown seated on a rock with a willow branch in a vase of water at her side. The Goddess employs this mysterious water and the branch for putting demons to flight. Taoism|Taoist witch es also use a small carving made from willow wood for communicating with the spirits of the dead. The image is sent to the nether world, where the disembodied spirit is deemed to enter it, and give the desired information to surviving relatives on its return.Cite book|title = Researches into Chinese Superstitions|last1=Doré S.J.|first1=Henry|last2=Kennelly, S.J. (Translator)|first2=M.|year=1914|publisher=Tusewei Press, Shanghai Vol I p. 2 The willow is a famous subject in many East Asian nations' cultures, particularly in pen and ink paintings from China and Japan.
:A gisaeng (Korean geisha ) named Hongrang, who lived in the middle of the Joseon Dynasty , wrote the poem "By the willow in the rain in the evening", which she gave to her parting lover (Choi Gyeong-chang).cite news|url= http://www.arirang.co.kr/Tv/TSymbols_Archive.asp? PROG_CODE=TVCR0271& view_cont_seq=4& code=St1& sys_lang=Eng|publisher=Arirang TV|title=The Forest of Willows in Our Minds|date= August 20, 2007. Retrieved September 10, 2007 Hongrang wrote:
"...I will be the willow on your bedside."
:In Japanese tradition, the willow is associated with ghosts. It is popularly supposed that a ghost will appear where a willow grows. Willow trees are also quite prevalent in folklore and myths.cite web|url= http://www.controverscial.com/Willow.htm | title=In Worship of Trees by George Knowles: Willow cite web|url= http://www.treesforlife.org.uk/forest/mythfolk/willow.html |title=Mythology and Folklore of the Willow
:In English folklore, a willow tree is believed to be quite sinister, capable of uprooting itself and stalking travellers. The Viminal hill, one of the Seven hills of rome|Seven Hills Of Rome , derives it name from the Latin word for osier, viminia (pl.).
Literature
:* In Psalm 137& nbsp;— "Upon the rivers of Babylon, there we sat and also cried in our remembering Zion. Upon the willows in the river's midst we hung our lyres." This Psalm is an ancient expression of Jews' yearning to return from the exile (Babylonian) to the Land of Zion. :* Hans Christian Andersen wrote a story called "Under the Willow Tree" (1853) in which children ask questions of a tree they call "willow-father", paired with another entity called " Elder Mother|elder-mother ".cite web|url= http://hca.gilead.org.il/under_wi.html |title=Under The Willow Tree |publisher=Hca.gilead.org.il |date=2007-12-13 |accessdate=2011-12-18 :* The Wind in the Willows :* Algernon Blackwood wrote a story called " The Willows (story)|The Willows " (1907) about two friends on a canoe trip down the Danube river who have a horrifying experience with the trees. This story was a personal favorite of H. P. Lovecraft . :* "Green Willow" is a Kaidan|Japanese ghost story in which a young samurai falls in love with a woman called Green Willow who has a close spiritual connection with a willow tree.cite web|url= http://www.spiritoftrees.org/folktales/martin/green_willow.html |title=Green Willow |publisher=Spiritoftrees.org |date= |accessdate=2011-12-18 "The Willow Wife" is another, not dissimilar tale. http://live-artist.com/fairytales/willow.html The Willow Wifedead link|date=December 2011 "Wisdom of the Willow Tree" is an Osage Nation story in which a young man seeks answers from a willow tree, addressing the tree in conversation as 'Grandfather'.cite web|url= http://tweedsblues.net/theparables/osage.html |title=Wisdom of the Willow Tree |publisher=Tweedsblues.net |date= |accessdate=2011-12-18 :* In J. K. Rowling 's Harry Potter and the Chamber of Secrets , and Harry Potter and the Prisoner of Azkaban , an old tree on the school grounds of Hogwarts is called the "Whomping Willow". It was planted to conceal a secret passageway through which Professor Remus Lupin roamed every full moon when he began his transformation into a Werewolf (Harry Potter)|werewolf . :* In William Shakespeare 's " Hamlet ", the character Ophelia climbed a willow tree; when a branch broke and dropped her into the river below, she drowned. In Shakespeare 's " Twelfth Night ", Viola (disguised as Cesario) tells Olivia "Make me a willow-cabin at your gate/ And call upon my soul within the house." - the willow here being an emblem of forsaken love. In Shakespeare 's " Othello ", Desdemona's song before her death uses the willow imagery to highlight her lost love. :* J. R. R. Tolkien 's The Lord of the Rings also features a character known as Old Man Willow who traps some of Frodo 's companions until they are rescued by Tom Bombadil . :* In Persian literature , the recognized adjective for 'willow' is lunatic (?????), and lover (or lovers' heart) is compared to willow in many texts. :* The willow is the symbol of wisdom. This is very clear in Disney's Pocahontas , in which Pocahontas asks the counsel of grandmother Willow. :* In Lloyd Alexander 's The Castle of Llyr the Companions follow Prince Rhun into a large sinkhole created when the Prince pulls too heartily on a clump of osiers, thus falling into the large cavern underneath the Isle of Mona.
Main species
The genus Salix is made up of around 400 species of deciduous tree s and shrub s:
Salix sitchensis C. A. Sanson ex Bong.& nbsp;– Sitka willow
Salix siuzevii Seemen
Salix starkeana Willd.
Salix subopposita Miq.
Salix subserrata Willd.
Salix suchowensis W. C. Cheng
Salix sungkianica Y. L. Chou & Skvortsov
Salix taxifolia Kunth& nbsp;– yew-leaf willow
Salix tenuijulis Ledeb.
Salix tetrasperma Roxb.& nbsp;– Indian willow
Salix triandra L.& nbsp;– almond willow or almond-leaved willow
Salix turanica Nasarow
Salix turfacea G. Haller ex Münchh.
Salix udensis Trautv. & C. A. Mey.
Salix uva-ursi Pursh.& nbsp;– bearberry willow
Salix variegata Franch.
Salix vestita Pursh.& nbsp;– silky willow
Salix viminalis L.& nbsp;– common osier
Salix vulpina Andersson
Salix waldsteiniana Willd.
Salix wallichiana Andersson
Salix wilhelmsiana M. Bieb.
Salix wilsonii Seemen
Salix yezoalpina Koidz.
See also
Portal|TreesCommons|Salix
Aravah (Sukkot)| Aravah , the Hebrew name of the willow, for its ritual use during the Jewish Feast of Tabernacles
List of Lepidoptera that feed on willows
Rhabdophaga rosaria , a willow gall
References
Reflist
Bibliography
Keeler, Harriet L. (1990). Our Native Trees and How to Identify Them. New York: Charles Scriber's Sons. Pages 393–395. ISBN 0-87338-838-0.
Newsholme, C. (1992). Willows: The Genus Salix . ISBN 0-88192-565-9
Warren-Wren, S.C. (1992). The Complete Book of Willows . ISBN 0-498-01262-X
Sviatlana Trybush, Šárka Jahodová, William Macalpine and Angela Karp. (2008). http://www.springerlink.com/content/t207v037633t21g6/ A genetic study of a Salix germplasm resource reveals new insights into relationships among subgenera, sections and species BioEnergy Research. 1(1):67& nbsp;– 79.
External links
http://www.pfaf.org/database/plants.php? Salix+alba Salix alba at plants for a futureDead link|date=March 2012
http://www.pfaf.org/database/plants.php? Salix+purpurea Salix purpurea at plants for a future
http://www.1911encyclopedia.org/Willow 1911 Encyclopaedia Britannica
http://www.cas.vanderbilt.edu/bioimages/species/frame/saca5.htm Salix caroliniana images at bioimages.vanderbilt.edu
http://www.cas.vanderbilt.edu/bioimages/species/frame/sani.htm Salix nigra images at bioimages.vanderbilt.edu