Fraxinus

Classification System: APG IV

Superregnum: Eukaryota
Regnum: Plantae
Cladus: Angiosperms
Cladus: Eudicots
Cladus: Core eudicots
Cladus: Asterids
Cladus: Lamiids
Ordo: Lamiales

Familia: Oleaceae
Tribus: Oleeae
Subtribus: Fraxininae
Genus: Fraxinus
Sectiones: F. sect. Dipetalae – F. sect. Fraxinus – F. sect. Melioides – F. sect. Ornus – F. sect. Pauciflorae – F. sect. Sciadanthus – Incertae sedis
Species: F. albicans – F. americana – F. angustifolia – F. anomala – F. apertisquamifera – F. × aucubifolia – F. baroniana – F. × borzae – F. berlandieriana – F. bungeana – F. caroliniana – F. × cataubiensis – F. chiisanensis – F. chinensis – F. cuspidata – F. depauperata – F. dimorpha – F. dipetala – F. dubia – F. excelsior – F. ferruginea – F. floribunda – F. gooddingii – F. greggii – F. griffithii – F. hookeri – F. hubeiensis – F. × hybrida – F. insularis – F. lanuginosa – F. latifolia – F. longicuspis – F. malacophylla – F. mandshurica – F. micrantha – F. nigra – F. odontocalyx – F. ornus – F. pallisiae – F. papillosa – F. paxiana – F. pennsylvanica – F. platypoda – F. potosina – F. pringlei – F. profunda – F. punctata – F. purpusii – F. quadrangulata – F. raibocarpa – F. reflexiflora – F. × rehderiana – F. rufescens – F. sieboldiana – F. smallii – F. sogdiana – F. stenolepis – F. stylosa – F. suaveolens – F. trifoliolata – F. uhdei – F. velutina – F. xanthoxyloides
Name

Fraxinus L., Sp. Pl.: 1057 (1753).

Type species Fraxinus excelsior L.

Synonyms

Heterotypic
Aplilia Raf., New Fl. 3: 93. 1836 publ. 1838.
Type species: non design.
Calycomelia Kostel., Allg. Med.-Pharm. Fl. 3: 1003. 1834.
Type species: non design.
Fraxinoides Medik., Vorles Churpfälz. Phys.-Okon. Ges. 1: 198. 1791.
Type species: non design.
Leptalix Raf., New Fl. 3: 93. 1836 publ. 1838.
Type species: non design.
Meliopsis Rchb., Deut. Bot. Herb.-Buch 135. 1841.
Type species: non design.
Ornus Boehm. in Ludwig, Def. Gen., ed. Boehmer, 476. 1760.
Mannaphorus Raf., Amer. Monthly Mag. & Crit. Rev. 2: 175. 1818, nom. illeg.
Ornanthes Raf., New Fl. 3: 93. 1836 publ. 1838, nom. illeg.
Type species: Ornus europaea Pers.
Petlomelia Nieuwl., Amer. Midl. Naturalist 3: 187. 1914.
Type species: Petlomelia dipetala (Hook. & Arn.) Nieuwl.
Samarpses Raf., New Fl.3: 93. 1836.
Type species: Samarpses triptera (Nutt.) Raf.

References
Primary references

Linnaeus, C. 1753. Species Plantarum 1: 1057.

Additional references

Komarov, V.L. et al. (eds.). 1934–1964. Flora SSSR. 30 vols. Moscow/Leningrad: Botanicheskii institut, Izdatel'stvo Akademii Nauk SSSR. Reference page.
Wu Zhengyi, Raven, P.H. & Hong Deyuan (eds.) 1994–2013. Flora of China. 25 vols. Science Press, Beijing & Missouri Botanical Garden Press, St. Louis. Online at eFloras.org Reference page.
Govaerts, R.H.A. 2001. World Checklist of Seed Plants Database in ACCESS E-F: 1-50919. [unavailable to the public] Reference page.
Wallander, E. 2008. Systematics of Fraxinus (Oleaceae) and evolution of dioecy. Plant Systematics and Evolution 273(1–2): 25–49. DOI: 10.1007/s00606-008-0005-3 Paywall. JSTOR Paywall. ResearchGate Open access. Reference page.
Dobignard, A. & Chatelain, C. 2013. Index synonymique de la flore d'Afrique du Nord. Volume 5: Dicotyledoneae: Oleaceae – Zygophyllaceae. Conservatoire et jardin botaniques, Genève, ISBN 978-2-8277-0128-5, 451 pp. PDF Reference page.
Dimopoulos, P., Raus, Th., Bergmeier, E., Constantinidis, Th., Iatroú, G., Kokkini, S., Strid, A. & Tzanoudakis, D. 2013. Vascular Plants of Greece: An Annotated Checklist. Englera 31: 1–368. Reference page.
Wallander, E. 2013. Systematics and floral evolution in Fraxinus (Oleaceae). Belgische Dendrologie Belge 2012: 38–58. PDF. Reference page.
Chang, C.S., Kim, H. & Chang, K.S. 2014. Provisional checklist of vascular plants for the Korea peninsula flora (KPF). 563 p. Seoul: T.B. Lee Herbarium. PDF Reference page.

Links

Govaerts, R. et al. 2019. Fraxinus in World Checklist of Selected Plant Families. The Board of Trustees of the Royal Botanic Gardens, Kew. Published on the internet. Accessed: 2019 Oct. 29. Reference page.
Hassler, M. 2019. Fraxinus. World Plants: Synonymic Checklists of the Vascular Plants of the World In: Roskovh, Y., Abucay, L., Orrell, T., Nicolson, D., Bailly, N., Kirk, P., Bourgoin, T., DeWalt, R.E., Decock, W., De Wever, A., Nieukerken, E. van, Zarucchi, J. & Penev, L., eds. 2019. Species 2000 & ITIS Catalogue of Life. Published on the internet. Accessed: 2019 Oct 26. Reference page.
International Plant Names Index. 2019. Fraxinus. Published online. Accessed: 26 October 2019.

Vernacular names
Ænglisc: Æsc
asturianu: Fresnu
беларуская: Ясень
български: Ясен
català: Freixe
čeština: Jasan
dansk: Ask
Deutsch: Eschen
English: Ash
Esperanto: Frakseno
español: Fresno
eesti: Saar
euskara: Lizar
suomi: Saarnet
français: Frêne
galego: Freixo
italiano: Frassino
lietuvių: Uosis
македонски: Јасен
Nederlands: Es
norsk: Askeslekten
polski: Jesion
português: Freixo
română: Frasin
русский: Ясень
slovenščina: Jesen
svenska: Askar
Türkçe: Dişbudak
українська: Ясен

Fraxinus /ˈfræksɪnəs/,[4] English name ash, is a genus of flowering plants in the olive and lilac family, Oleaceae. It contains 45–65 species of usually medium to large trees, mostly deciduous, though a number of subtropical species are evergreen. The genus is widespread across much of Europe, Asia, and North America.[3][5][6][7][8]

The leaves are opposite (rarely in whorls of three), and mostly pinnately compound, though simple in a few species. The seeds, popularly known as "keys" or "helicopter seeds", are a type of fruit known as a samara. Some Fraxinus species are dioecious, having male and female flowers on separate plants but sex in ash is expressed as a continuum between male and female individuals, dominated by unisexual trees. With age, ash may change their sexual function from predominantly male and hermaphrodite towards femaleness ;[9] if grown as an ornamental and both sexes are present, ashes can cause a considerable litter problem with their seeds. Rowans or mountain ashes have leaves and buds superficially similar to those of true ashes, but belong to the unrelated genus Sorbus in the rose family.

Etymology

The tree's common English name, "ash", traces back to the Old English æsc, which relates to the proto-Indo-European for the tree, while the generic name originated in Latin from a proto-Indo-European word for birch. Both words are also used to mean "spear" in their respective languages, as the wood is good for shafts.[10]
Selected species

Species are arranged into sections supported by phylogenetic analysis:[11][12]

Section Dipetalae

Fraxinus anomala Torr. ex S.Watson – singleleaf ash
Fraxinus dipetala Hook. & Arn. – California ash or two-petal ash
Fraxinus quadrangulata Michx. – blue ash
Fraxinus trifoliolata

Section Fraxinus

Fraxinus angustifolia Vahl – narrow-leafed ash
Fraxinus angustifolia subsp. oxycarpa – Caucasian ash
Fraxinus angustifolia subsp. syriaca
Fraxinus excelsior L. – European ash
Fraxinus holotricha Koehne
Fraxinus mandshurica Rupr. – Manchurian ash
Fraxinus nigra Marshall – black ash
Fraxinus pallisiae Wilmott – Pallis' ash
Fraxinus sogdiana Bge

Section Melioides sensu lato

Fraxinus chiisanensis
Fraxinus cuspidata Torr. – fragrant ash
Fraxinus platypoda
Fraxinus spaethiana Lingelsh. – Späth's ash

Section Melioides sensu stricto

Fraxinus albicans Buckley – Texas ash
Fraxinus americana L. – white ash or American ash
Fraxinus berlandieriana DC. – Mexican ash
Fraxinus caroliniana Mill. – Carolina ash
Fraxinus latifolia Benth. – Oregon ash
Fraxinus papillosa Lingelsh. – Chihuahua ash
Fraxinus pennsylvanica Marshall – green ash
Fraxinus profunda (Bush) Bush – pumpkin ash
Fraxinus uhdei (Wenz.) Lingelsh. – Shamel ash or tropical ash
Fraxinus velutina Torr. – velvet ash or Arizona ash

Section Ornus

Fraxinus apertisquamifera
Fraxinus baroniana
Fraxinus bungeana DC. – Bunge's ash
Fraxinus chinensis Roxb. – Chinese ash or Korean ash
Fraxinus floribunda Wall. – Himalayan manna ash
Fraxinus griffithii C.B.Clarke – Griffith's ash
Fraxinus japonica – Japanese ash
Fraxinus lanuginosa – Japanese ash
Fraxinus longicuspis
Fraxinus malacophylla
Fraxinus micrantha Lingelsh.
Fraxinus ornus L. – manna ash or flowering ash
Fraxinus paxiana Lingelsh.
Fraxinus sieboldiana Blume – Japanese flowering ash

Section Pauciflorae

Fraxinus dubia
Fraxinus gooddingii – Goodding's ash
Fraxinus greggii A.Gray – Gregg's ash
Fraxinus purpusii
Fraxinus rufescens

Section Sciadanthus

Fraxinus dimorpha
Fraxinus hubeiensis Ch'u & Shang & Su – 湖北梣 hu bei qin
Fraxinus xanthoxyloides (G.Don) Wall. ex DC. – Afghan ash[13][14]

Closeup of European ash seeds

F. ornus

Unusual "treelets" growing from a fallen ash tree in Lawthorn Wood, Ayrshire, Scotland

Ecology

North American native ash tree species are a critical food source for North American frogs, as their fallen leaves are particularly suitable for tadpoles to feed upon in ponds (both temporary and permanent), large puddles, and other water bodies.[15] Lack of tannins in the American ash makes their leaves a good food source for the frogs, but also reduces its resistance to the ash borer. Species with higher leaf tannin levels (including maples and non-native ash species) are taking the place of native ash, thanks to their greater resistance to the ash borer. They produce much less suitable food for the tadpoles, resulting in poor survival rates and small frog sizes.[15]

Ash species native to North America also provide important habit and food for various other creatures native to North America. This includes the larvae of multiple long-horn beetles, as well as other insects including those in the genus Tropidosteptes, lace bugs, aphids, larvae of gall flies, and caterpillars. Birds are also interested in black, green, and white ash trees. The black ash alone supports wood ducks, wild turkey, cardinals, pine grosbeaks, cedar waxwings, and yellow-bellied sapsuckers, with habitat and food (such as the sap being of interest to the sapsucker) among others. Many mammalian species from meadow voles eating the seeds, white-tailed deer eating the foliage, to silver-haired bats nesting, will also make use of ash trees. [16][17][18][19]

Ash is used as a food plant by the larvae of some Lepidoptera species (butterflies and moths).
Threats
Canker on an ash tree in North Ayrshire, Scotland
North America
Emerald ash borer

The emerald ash borer (Agrilus planipennis, EAB) is a wood-boring beetle accidentally introduced to North America from eastern Asia via solid wood packing material in the late 1980s to early 1990s. It has killed tens of millions of trees in 22 states in the United States[20] and adjacent Ontario and Quebec in Canada. It threatens some seven billion ash trees in North America. Research is being conducted to determine if three native Asian wasps that are natural predators of EAB could be used as a biological control for the management of EAB populations in the United States. The public is being cautioned not to transport unfinished wood products, such as firewood, to slow the spread of this insect pest.[21]

Damage occurs when emerald ash borer larvae feed on the inner bark, phloem, inside brands and tree trunks. Feeding on the phloem prevents nutrients and water transportation. If the ash is attacked, the branches can die and eventually the whole tree can as well.[22] Ways to detect emerald ash borer infestation include seeing bark peeling off, vertical strips in the bark, seeing galleries within the tree that contain powdery substance, and D-shaped exit holes on the branches or trunk. Not all of these may be present, but these warning signs could be a good indication of possible infestation.[23]
Europe

The European ash, Fraxinus excelsior, has been affected by the fungus Hymenoscyphus fraxineus, causing ash dieback[24] in a large number of trees since the mid-1990s, particularly in eastern and northern Europe.[25][26] The disease has infected about 90% of Denmark's ash trees.[27] At the end of October 2012 in the UK, the Department for Environment, Food and Rural Affairs (Defra) reported that ash dieback had been discovered in mature woodland in Suffolk; previous occurrences had been on young trees imported from Europe.[28] In 2016, the ash tree was reported as in danger of extinction in Europe.[29]
Uses

Ash is a hardwood and is hard, dense (within 20% of 670 kg/m3 for Fraxinus americana,[30] and higher at 710 kg/m3 for Fraxinus excelsior[31]), tough and very strong but elastic, extensively used for making bows, tool handles, baseball bats, hurleys, and other uses demanding high strength and resilience.
5/16" thick flame figure quartersawn ash guitar top, unmilled

Ash, particularly Swamp ash because of its figure, is a choice of material for electric guitar bodies[32] and, less commonly, for acoustic guitar bodies, known for its bright, cutting edge and sustaining quality. Some Fender Stratocasters and Telecasters are made of ash, (such as Bruce Springsteen's Telecaster on the Born to Run album cover), as an alternative to alder. They are also used for making drum shells.
Ash coffee table

Woodworkers generally consider ash a "poor cousin" to the other major open pore wood, oak, but it is useful in any furniture application. Ash veneers are extensively used in office furniture. Ash is not used much outdoors due to the heartwood having a low durability to ground contact, meaning it will typically perish within five years. The F. japonica species is favored as a material for making baseball bats by Japanese sporting-goods manufacturers.[33]

Its robust structure, good looks, and flexibility combine to make ash ideal for staircases. Ash stairs are extremely hard-wearing, which is particularly important for treads. Due to its elasticity, ash can also be steamed and bent to produce curved stair parts such as volutes (curled sections of handrail) and intricately shaped balusters. However, a reduction in the supply of healthy trees, especially in Europe, is making ash an increasingly expensive option.

Ash was commonly used for the structural members of the bodies of cars made by carriage builders. Early cars had frames which were intended to flex as part of the suspension system to simplify construction. The Morgan Motor Company of Great Britain still manufactures sports cars with frames made from ash. It was also widely used by early aviation pioneers for aircraft construction.

It lights and burns easily, so is used for starting fires and barbecues, and is usable for maintaining a fire, though it produces only a moderate heat. The two most economically important species for wood production are white ash, in eastern North America, and European ash in Europe. The green ash (F. pennsylvanica) is widely planted as a street tree in the United States. The inner bark of the blue ash (F. quadrangulata) has been used as a source for blue dye.

In Sicily, Italy, sugars are obtained by evaporating the sap of the manna ash, extracted by making small cuts in the bark.The manna ash, native to southern Europe and southwest Asia, produces a blue-green sap, which has medicinal value as a mild laxative, demulcent, and weak expectorant.
Mythology and folklore

In Greek mythology, the Meliae are nymphs associated with the ash, perhaps specifically of the manna ash (Fraxinus ornus), as dryads were nymphs associated with the oak. They appear in Hesiod's Theogony.

In Norse mythology, a vast, evergreen ash tree Yggdrasil ("the steed (gallows) of Odin"), watered by three magical springs, serves as axis mundi, sustaining the nine worlds of the cosmos in its roots and branches. Askr, the first man in Norse myth, literally means 'ash'.[34]

In Italian folklore, an ash stake could be used to kill a vampire.[35]
See also

List of Lepidoptera that feed on ashes
Æ, the letter ash

References

"Fraxinus L." Germplasm Resources Information Network. United States Department of Agriculture. 3 April 2006. Retrieved 21 August 2016.
Franz Eugen Köhler, Köhler's Medizinal-Pflanzen
"Fraxinus". World Checklist of Selected Plant Families. Kew Royal Botanical Gardens. Retrieved 16 April 2016.
Sunset Western Garden Book, 1995, pp. 606–607
"Fraxinus". Altervista Flora Italiana. Retrieved 16 April 2016.
"Fraxinus Linnaeus, Sp. Pl. 2: 1057. 1753". Flora of China. p. 273 – via 衿属 qin shu.
Philips, Roger (1979). Trees of North America and Europe: A Guide to Field Identification, Revised and Updated. New York: Random House. ISBN 0-394-50259-0. OCLC 4036251.
"Genus Fraxinus". US Department of Agriculture. Retrieved 21 August 2016.
Gender variation in ash (Fraxinus excelsior L.) Pierre Binggeli & James Power (1991)
Mallory, J. P.; Adams, Douglas Q., eds. (1997). Encyclopedia of Indo-European culture. Taylor & Francis. p. 32. ISBN 978-1-884964-98-5.
"Systematics of Fraxinus (Oleaceae) and evolution of dioecy" (PDF). Retrieved 28 August 2016.
Hinsinger, Damien Daniel; Basak, Jolly; Gaudeul, Myriam; Cruaud, Corinne; Bertolino, Paola; Frascaria-Lacoste, Nathalie; Bousquet, Jean (21 November 2013). "The Phylogeny and Biogeographic History of Ashes ( Fraxinus, Oleaceae) Highlight the Roles of Migration and Vicariance in the Diversification of Temperate Trees". PLOS ONE. 8 (11): e80431. Bibcode:2013PLoSO...880431H. doi:10.1371/journal.pone.0080431. PMC 3837005. PMID 24278282.
"Species Records of Fraxinus". Germplasm Resources Information Network. United States Department of Agriculture. Retrieved 22 February 2010.
"Fraxinus L." ITIS Standard Reports. Integrated Taxonomic Information System. Retrieved 22 February 2010.
Stephens, Jeffrey; Bervan, Keith; Tiegs, Scott (3 May 2013). "Anthropogenic changes to leaf litter input affect the fitness of a larval amphibian". Freshwater Biology. 58 (8): 1631–1646. doi:10.1111/fwb.12155.
"Black Ash". Illinois Wildflowers. Dr. John Hilty. Retrieved 27 August 2018.
"White Ash". Illinois Wildflowers. Dr. John Hilty. Retrieved 27 August 2018.
"Green Ash". Illinois Wildflowers. Dr. John Hilty. Retrieved 27 August 2018.
"Red Ash". Illinois Wildflowers. Dr. John Hilty. Retrieved 27 August 2018.
Moy, Derek. "About Emerald Ash Borer". Emerald Ash Borer Information Network.
"The Problem". Don't Move Firewood. Retrieved 14 October 2011.
Emerald Ash Borer and Your Woodland (PDF) (Report). Extension Bulletin E-2943. Michigan State University Extension. September 2007.
Ball, John (April 2018). How to Identify an Ash Tree Infested by Emerald Ash Borer (PDF) (Report). SDSU Extension.
Kowalski T (2006). "Chalara fraxinea sp. nov. associated with dieback of ash (Fraxinus excelsior) in Poland". Forest Pathology. 36 (4): 264–270. doi:10.1111/j.1439-0329.2006.00453.x.
Halmschlager E, Kirisits T (2008). "First report of the ash dieback pathogen Chalara fraxinea on Fraxinus excelsior in Austria". New Disease Reports. 17: 20. Retrieved 10 February 2010.
Ogris N, Hauptman T, Jurc D (2009). "Chalara fraxinea causing common ash dieback newly reported in Slovenia". New Disease Reports. 19: 15. Retrieved 10 February 2010.
"'Ash dieback' fungus Chalara fraxinea in UK countryside". BBC. 25 October 2012. Retrieved 25 October 2012.
BBC News 'Ash dieback' fungus, Chalara fraxinea found in UK countryside. Retrieved 25 October 2012.
Marshall, Claire (23 March 2016). "Ash tree set for extinction in Europe". BBC.
"White Ash". Niche Timbers. Retrieved 22 February 2010.
"Ash". Niche Timbers. Retrieved 22 February 2010.
SWAMP ASH Lumber Guide: 8/4 Lightweight Guitar Wood 2020 15 December 2018 www.commercialforestproducts.com, accessed 27 September 2020
"美津和タイガー/野球博物館/バットのできるまで" [Mitsuwa Tiger / Baseball Hall / Bat]. www.mitsuwa-tiger.com.
Simek, Rudolf (2007). Dictionary of Northern Mythology. Translated by Angela Hall. D.S. Brewer. ISBN 978-0-85991-513-7.
Del Lao, Nero (2013). Perpetuum Mobile: Il Segreto per non Morire. Xlibris Corporation. ISBN 978-1-49313-8388.