Aesculus hippocastanum

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Aesculus hippocastanum
Illustration Aesculus hippocastanum0 clean.jpg
Botanical illustration (1885)
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Sapindales
Family: Sapindaceae
Genus: Aesculus
Species:
A. hippocastanum
Binomial name
Aesculus hippocastanum
L.

Aesculus hippocastanum, the horse chestnut, [1] [2] [3] is a species of flowering plant in the maple, soapberry and lychee family Sapindaceae. It is a large, deciduous, synoecious (hermaphroditic-flowered) tree. [4] It is also called horse-chestnut, [5] European horsechestnut, [6] buckeye, [7] and conker tree. [8] It is not to be confused with the sweet chestnut or Spanish chestnut, Castanea sativa , which is a tree in another family, Fagaceae. [9] : 371 

Contents

Description

Aesculus hippocastanum is a large tree, growing to about 39 metres (128 ft) tall [9] with a domed crown of stout branches. On old trees, the outer branches are often pendulous with curled-up tips. The leaves are opposite and palmately compound, with 5–7 leaflets 13–30 cm (5–12 in) long, making the whole leaf up to 60 cm (24 in) across, with a 7–20 cm (3–8 in) petiole. The leaf scars left on twigs after the leaves have fallen have a distinctive horseshoe shape, complete with seven "nails". The flowers are usually white with a yellow to pink blotch at the base of the petals; [9] they are produced in spring in erect panicles 10–30 cm (4–12 in) tall with about 20–50 flowers on each panicle. Its pollen is not poisonous for honey bees. [10] Usually only 1–5 fruits develop on each panicle. The shell is a green, spiky capsule containing one (rarely two or three) nut-like seeds called conkers or horse-chestnuts. Each conker is 2–4 cm (3⁄4–1+1⁄2 in) in diameter, glossy nut-brown with a whitish scar at the base. [11]

Inflorescence Horse chestnut flowers in Brodalen 4.jpg
Inflorescence
Floral diagram of A. hippocastanum. The light green structure denotes nectary. Floral formula: \ K5 C2:2 A5+2 G (3). Aesculus hippocastanum floral diagram colored.svg
Floral diagram of A. hippocastanum. The light green structure denotes nectary. Floral formula: ↘ K5 C2:2 A5+2 G(3).

Etymology

The common name horse chestnut originates from the similarity of the leaves and fruits to sweet chestnuts, Castanea sativa (a tree in a different family, the Fagaceae), [9] together with the alleged observation that the fruit or seeds could help panting or coughing horses. [12] [13]

Although it is sometimes known as buckeye, [7] for the resemblance of the seed to a deer's eye, the term buckeye is more commonly used for New World members of the genus Aesculus . [14]

Distribution and habitat

The native distribution of Aesculus hippocastanum given by different sources varies. As of March 2023, Plants of the World Online considered it to be native to the Balkans (Albania, Bulgaria, Greece and former Yugoslavia), but also to Turkey and Turkmenistan. [15] A 2017 assessment for the IUCN Red List restricted the native distribution to the Balkan area: Albania, Bulgaria, mainland Greece and North Macedonia. [1] It has been introduced and planted around the world. It can be found in many parts of Europe as far north as Harstad north of the Arctic Circle in Norway, [16] and Gästrikland in Sweden as well as in many parks and cities around the northern United States and Canada such as Edmonton in Canada. [17]

The compact native population of horse chestnut in Bulgaria is distinct from the horse chestnut forests of northern Greece, western North Macedonia and Albania. It is limited to an area of 9 ha in the Preslav Mountain north of the Balkan Mountains, in the valleys of the Dervishka and Lazarska rivers. Bulgaria's relict horse chestnut forests are critically endangered at the national level and protected as part of the Dervisha Managed Nature Reserve. [18]

Uses

It is widely cultivated in streets and parks throughout the temperate world, and has been particularly successful in places like Ireland, Great Britain and New Zealand, where they are commonly found in parks, streets and avenues. Cultivation for its spectacular spring flowers is successful in a wide range of temperate climatic conditions provided summers are not too hot, with trees being grown as far north as Edmonton, Alberta, Canada, [19] the Faroe Islands, [20] Reykjavík, Iceland and Harstad, Norway.

In Britain and Ireland, the seeds are used for the popular children's game conkers. During the First World War, there was a campaign to ask for everyone (including children) to collect the seeds and donate them to the government. The conkers were used as a source of starch for fermentation using the Clostridium acetobutylicum method devised by Chaim Weizmann to produce acetone for use as a solvent for the production of cordite, which was then used in military armaments. Weizmann's process could use any source of starch, but the government chose to ask for conkers to avoid causing starvation by depleting food sources. But conkers were found to be a poor source, and the factory only produced acetone for three months; however, they were collected again in the Second World War for the same reason. [21]

A selection of fresh conkers Aesculus hippocastanum fruit.jpg
A selection of fresh conkers

The seeds, especially those that are young and fresh, are slightly poisonous, containing alkaloid saponins and glucosides. Although not dangerous to touch, they cause sickness when eaten; consumed by horses, they can cause tremors and lack of coordination. [22]

The horse-chestnut is a favourite subject for bonsai. [23]

Though the seeds are said to repel spiders there is little evidence to support these claims. The presence of saponin may repel insects but it is not clear whether this is effective on spiders. [24]

Aesculus hippocastanum is affected by the leaf-mining moth Cameraria ohridella , whose larvae feed on horse chestnut leaves. The moth was described from North Macedonia where the species was discovered in 1984 but took 18 years to reach Britain. [25]

In Germany, they are commonly planted in beer gardens, particularly in Bavaria. Prior to the advent of mechanical refrigeration, brewers would dig cellars for lagering. To further protect the cellars from the summer heat, they would plant horse chestnut trees, which have spreading, dense canopies but shallow roots which would not intrude on the caverns. The practice of serving beer at these sites evolved into the modern beer garden. [26]

An inexpensive detergent for washing clothes can be made at home from conkers, and this is said to be an environmentally benign ('eco-friendly') detergent. [27]

Traditional medicine

Aescin Beta-Aescin.svg
Aescin

The seed extract standardized to around 20 percent aescin (escin) is possibly useful in traditional medicine for its effect on venous tone. [28] [29] A Cochrane Review suggested that horse chestnut seed extract may be an efficacious and safe short-term treatment for chronic venous insufficiency, but definitive randomized controlled trials had not been conducted to confirm the efficacy. [30]

Safety

Remainders of horse chestnut flower spikes found on the ground below. The chestnuts themselves have separated with their burs from the small branches shown. Horse chestnut flower spikes found on the ground - Utrecht, the Netherlands - October 2021 - 2.jpg
Remainders of horse chestnut flower spikes found on the ground below. The chestnuts themselves have separated with their burs from the small branches shown.
Remainders of two horse chestnut flower spikes - one 27 cm long - with two chestnuts found on the ground under the tree. The chestnuts themselves have separated with their burs from the small branches shown. Horse chestnut flower spikes with chestnuts found on the ground - Utrecht, the Netherlands - November 2021 - 2.jpg
Remainders of two horse chestnut flower spikes – one 27 cm long – with two chestnuts found on the ground under the tree. The chestnuts themselves have separated with their burs from the small branches shown.

There is risk of acute kidney injury, "when patients, who had undergone cardiac surgery were given high doses of horse chestnut extract i.v. for postoperative oedema. The phenomenon was dose dependent as no alteration in kidney function was recorded with 340 μg/kg, mild kidney function impairment developed with 360 μg/kg and acute kidney injury with 510 μg/kg". [31]

Raw horse chestnut seed, leaf, bark and flower are toxic due to the presence of aesculin and should not be ingested. Horse chestnut seed is classified by the FDA as an unsafe herb. [32] The glycoside and saponin constituents are considered toxic. [32]

Other chemicals

Quercetin 3,4'-diglucoside, a flavonol glycoside can also be found in horse chestnut seeds. [33] Leucocyanidin, leucodelphinidin and procyanidin A2 can also be found in horse chestnut.

Anne Frank tree

A fine specimen of the horse-chestnut was outside the window of the "secret annex" in the centre of Amsterdam, which Anne Frank mentioned in her diary and which survived until August 2010, when a heavy wind blew it over. [34] [35] Eleven young specimens, sprouted from seeds from this tree, were transported to the United States. After a long quarantine in Indianapolis, each tree was shipped off to a new home at a notable museum or institution in the United States, such as the 9/11 Memorial Park, Little Rock Central High School, and two Holocaust Centers. One of them was planted outdoors in March 2013 in front of The Children's Museum of Indianapolis, where they were originally quarantined. [36]

Symbol of Kyiv

The horse chestnut tree is one of the symbols of Kyiv, the capital of Ukraine. [37]

Diseases

Horse-chestnut leaf miner (Cameraria ohridella) tree damage in Parma, Italy 10 Pest damage - horse-chestnut leaf miner (Cameraria ohridella) in Parma, Italy.jpg
Horse-chestnut leaf miner ( Cameraria ohridella ) tree damage in Parma, Italy

Other sources

Related Research Articles

<span class="mw-page-title-main">Chestnut blight</span> Fungus disease of chestnut trees

The pathogenic fungus Cryphonectria parasitica is a member of the Ascomycota. This necrotrophic fungus is native to East Asia and South East Asia and was introduced into Europe and North America in the early 1900s. Strains of the fungus spread more or less rapidly and caused significant tree loss in both regions. Strains of the fungus can be more or less virulent.

<span class="mw-page-title-main">Sapindaceae</span> Family of flowering plants

The Sapindaceae are a family of flowering plants in the order Sapindales known as the soapberry family. It contains 138 genera and 1,858 accepted species. Examples include horse chestnut, maples, ackee and lychee.

<span class="mw-page-title-main">Sweet chestnut</span> Species of tree

The sweet chestnut, also know as the Spanish chestnut or just chestnut, is a species of tree in the family Fagaceae, native to Southern Europe and Asia Minor, and widely cultivated throughout the temperate world. A substantial, long-lived deciduous tree, it produces an edible seed, the chestnut, which has been used in cooking since ancient times.

<i>Aesculus pavia</i> Species of tree

Aesculus pavia, known as red buckeye or firecracker plant, is a species of deciduous flowering plant. The small tree or shrub is native to the southern and eastern parts of the United States, found from Illinois to Virginia in the north and from Texas to Florida in the south. It is hardy far to the north of its native range, with successful cultivation poleward to Arboretum Mustila in Finland.

<i>Aesculus</i> Flowering genus in family Sapindaceae

The genus Aesculus, with species called buckeye and horse chestnut, comprises 13–19 species of flowering plants in the family Sapindaceae. They are trees and shrubs native to the temperate Northern Hemisphere, with six species native to North America and seven to 13 species native to Eurasia. Several hybrids occur. Aesculus exhibits a classical Arcto-Tertiary distribution.

<span class="mw-page-title-main">Horse-chestnut leaf miner</span> Species of moth

The horse-chestnut leaf miner is a leaf-mining moth of the family Gracillariidae. The horse-chestnut leaf miner was first observed in North Macedonia in 1984, and was described as a new species in 1986. Its larvae are leaf miners on the common horse-chestnut. The horse-chestnut leafminer was first collected and inadvertently pressed in herbarium sheets by the botanist Theodor von Heldreich in central Greece in 1879.

Horse chestnut may refer to:

<i>Aesculus flava</i> Species of tree

Aesculus flava, also known commonly as the common buckeye, the sweet buckeye, and the yellow buckeye, is a species of deciduous tree in the subfamily Hippocastanoideae of the family Sapindaceae. The species is native to the Ohio Valley and Appalachian Mountains of the Eastern United States. It grows in mesophytic forest or floodplains, generally in acid to circumneutral soil, reaching a height of 20m to 48m.

<i>Aesculus californica</i> Species of plant

Aesculus californica, commonly known as the California buckeye or California horse-chestnut, is a species of buckeye native to California and southwestern Oregon.

<i>Castanea crenata</i> Species of flowering plant

Castanea crenata, the Japanese chestnut or Korean chestnut, is a species of chestnut native to Japan and Korea. Castanea crenata exhibits resistance to Phytophthora cinnamomi, the fungal pathogen that causes ink disease in several Castanea species. The mechanism of resistance of Castanea crenata to Phytophthora cinnamomi may derive from its expression of the Cast_Gnk2-like gene.

<span class="mw-page-title-main">Aesculin</span> Chemical compound

Aesculin, also called æsculin or esculin, is a coumarin glucoside that naturally occurs in the trees horse chestnut, California buckeye, prickly box, and daphnin. It is also found in dandelion coffee and olive bark. It is reported to present in olive bark, not in olive leaf, therefore, identification of aesculin in abundant in an extract indicates the extract derived from olive bark.

Conker may refer to:

<i>Aesculus <span style="font-style:normal;">×</span> carnea</i> Species of flowering plant

Aesculus × carnea, or red horse-chestnut, is a medium-sized tree, an artificial hybrid between A. pavia and A. hippocastanum (horse-chestnut). Its origin uncertain, probably appearing in Germany before 1820. It is a popular tree in large gardens and parks; and is even present in Hyde Park, London.

<span class="mw-page-title-main">Aescin</span> Main active component in horse chestnut

Aescin or escin is a mixture of saponins with anti-inflammatory, vasoconstrictor and vasoprotective effects found in Aesculus hippocastanum. Aescin is the main active component in horse chestnut, and is responsible for most of its medicinal properties. The main active compound of aescin is β-aescin, although the mixture also contains various other components including α-aescin, protoescigenin, barringtogenol, cryptoescin and benzopyrones.

<span class="mw-page-title-main">Leucodelphinidin</span> Chemical compound

Leucodelphinidin is a colorless chemical compound related to leucoanthocyanidins. It can be found in Acacia auriculiformis, in the bark of Karada and in the kino (gum) from Eucalyptus pilularis.

Bleeding canker of horse chestnut is a common canker of horse chestnut trees that is known to be caused by infection with several different pathogens.

<span class="mw-page-title-main">National Arboretum Canberra</span>

The National Arboretum Canberra is a 250-hectare (620-acre) arboretum in Canberra, the national capital of Australia, created after the area was burned out as a result of the Christmas 2001 and 2003 Canberra bushfires: The Himalayan Cedar forest lost about one third of its trees, and the commercial Radiata Pine plantation was burned out, allowing the arboretum to be created.

<i>Aesculus indica</i> Species of plant

Aesculus indica, commonly known as the Indian horse-chestnut or Himalayan horse chestnut, is a species of deciduous broad-leaved tree in the family Sapindaceae.

<span class="mw-page-title-main">Lithocolletinae</span> Subfamily of moths

Lithocolletinae is a subfamily of insects in the moth family Gracillariidae. It is distributed worldwide, with most species in temperate regions.

<i>Aesculus chinensis</i> Species of flowering plant

Aesculus chinensis, the Chinese horse chestnut or Chinese buckeye, is a deciduous temperate tree species in the genus Aesculus found across China. It was first successfully introduced to Britain in 1912 by plant collector William Purdom, who collected six young plants from the grounds of a temple in the western hills of Beijing, and brought them back to Veitch's Nursery in Coombe Hill near London. Purdom's correspondence regarding this event are held in the archives of the Arnold Arboretum. One plant was sent to the Royal Botanic Gardens Kew and two to the Arnold Arboretum in Boston. The original tree at Kew no longer exists but a young tree grafted from the original now grows in the Rhododendron Dell.

References

  1. 1 2 3 Allen, D.J.; Khela, S. (2018) [errata version of 2017 assessment]. "Aesculus hippocastanum". IUCN Red List of Threatened Species . 2017: e.T202914A122961065. Retrieved 27 September 2019.
  2. ↑ USDA, NRCS (n.d.). "​Aesculus hippocastanum​". The PLANTS Database (plants.usda.gov). Greensboro, North Carolina: National Plant Data Team. Retrieved 26 September 2020.
  3. ↑ Brouillet L, Desmet P, Coursol F, Meades SJ, Favreau M, Anions M, Bélisle P, Gendreau C, Shorthouse D, et al. "Aesculus hippocastanum Linnaeus". data.canadensys.net. Database of Vascular Plants of Canada (VASCAN). Archived from the original on 2018-02-17. Retrieved 26 September 2020.
  4. ↑ "Aesculus hippocastanum: Reproduction". Archived from the original on 2015-01-30.
  5. ↑ BSBI List 2007 (xls). Botanical Society of Britain and Ireland. Archived from the original (xls) on 2015-06-26. Retrieved 2014-10-17.
  6. ↑ "Aesculus hippocastanum (Common Horsechestnut, European Horsechestnut, Horsechestnut) | North Carolina Extension Gardener Plant Toolbox". plants.ces.ncsu.edu. Retrieved 24 March 2021.
  7. 1 2 "Horse Chestnut". NCCIH.
  8. ↑ Coles, Jeremy. "Why we love conkers and horse chestnut trees". BBC Earth . Retrieved 23 March 2021.
  9. 1 2 3 4 Stace, C. A. (2010). New Flora of the British Isles (Third ed.). Cambridge, U.K.: Cambridge University Press. ISBN   9780521707725.
  10. ↑ "Bee Trees - Horse Chestnut | Beespoke Info". beespoke.info.
  11. ↑ Rushforth, K. (1999). Trees of Britain and Europe. Collins ISBN   0-00-220013-9.
  12. ↑ Lack, H. Walter. "The Discovery and Rediscovery of the Horse Chestnut" (PDF). Arnoldia. 61 (4). Archived from the original (PDF) on 2010-07-27.
  13. ↑ Little, Elbert L. (1994) [1980]. The Audubon Society Field Guide to North American Trees: Western Region (Chanticleer Press ed.). Knopf. p. 541. ISBN   0394507614.
  14. ↑ Wott, John A. "The Many Faces of Aesculus" (PDF). Washington Park Arboretum Bulletin.
  15. ↑ "Aesculus hippocastanum L." Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 2023-03-28.
  16. ↑ "Hestekastanje".
  17. ↑ "Holowach Tree". Archived from the original on 2023-09-23. Retrieved 2023-10-07.
  18. ↑ "Forests of Horse chestnut (Aesculus hippocastanum) :: Red Data Book of Bulgaria". e-ecodb.bas.bg. Retrieved 2023-02-10.
  19. ↑ Edmonton
  20. ↑ Højgaard, A., Jóhansen, J., & Ødum, S. (1989). A century of tree planting on the Faroe Islands. Ann. Soc. Sci. Faeroensis Supplementum 14.
  21. ↑ "Conkers - collected for use in two world wars". Making history. BBC. Retrieved 27 September 2014.
  22. ↑ Lewis, Lon D. (1995). Feeding and care of the horse. Wiley-Blackwell. ISBN   9780683049671 . Retrieved 2011-10-21.
  23. ↑ D'Cruz, Mark. "Ma-Ke Bonsai Care Guide for Aesculus hippocastanum". Ma-Ke Bonsai. Archived from the original on 2012-03-15. Retrieved 2011-07-05.
  24. ↑ Edwards, Jon (2010). "Spiders vs conkers: the definitive guide". Royal Society of Chemistry. Archived from the original on 2013-09-06. Retrieved 2013-09-09.
  25. ↑ Lees, D.C.; Lopez-Vaamonde, C.; Augustin, S. 2009. Taxon page for Cameraria ohridella Deschka & Dimic 1986. In: EOLspecies, http://www.eol.org/pages/306084. First Created: 2009-06-22T13:47:37Z. Last Updated: 2009-08-10T12:57:23Z.
  26. ↑ Schäffer, Albert (2012-05-21). "120 Minuten sind nicht genug" [120 minutes aren't enough]. Frankfurter Allgemeine Zeitung (in German). Retrieved 2016-10-11.
  27. ↑ "How to Make Laundry Detergent from Conkers (Horse Chestnuts)".
  28. ↑ Diehm, C.; Trampisch, H. J.; Lange, S.; Schmidt, C. (1996). "Comparison of leg compression stocking and oral horse-chestnut seed extract therapy in patients with chronic venous insufficiency". Lancet. 347 (8997): 292–4. doi: 10.1016/s0140-6736(96)90467-5 . PMID   8569363. S2CID   20408233.
  29. ↑ "Horse chestnut". National Center for Complementary and Integrative Health. 1 October 2020. Retrieved 27 October 2022.
  30. ↑ Pittler MH, Ernst E. (2012). "Horse chestnut seed extract for chronic venous insufficiency". Cochrane Database Syst Rev. 11 (11): CD003230. doi:10.1002/14651858.CD003230.pub4. PMC   7144685 . PMID   23152216.
  31. ↑ Parfitt, Kathleen (1999). Martindale: The complete drug reference.: Das komplette Arzneimittelverzeichnis. pp.  1543–4. ISBN   085369429X.
  32. 1 2 "Horse chestnut". Memorial Sloan-Kettering Cancer Center. 29 March 2022. Retrieved 27 October 2022.
  33. ↑ Wagner, J. (1961). "Quercetin-3,4?-diglukosid, ein Flavonolglykosid des Roßkastaniensamens". Die Naturwissenschaften. 48 (2): 54. Bibcode:1961NW.....48Q..54W. doi:10.1007/BF00603428. S2CID   29060667.
  34. ↑ Sterling, Toby (24 August 2010). "Anne Frank's 'beautiful' tree felled by Amsterdam storm". The Scotsman. Retrieved 24 August 2010.
  35. ↑ Gray-Block, Aaron (23 August 2010). "Anne Frank tree falls over in heavy wind, rain". Reuters. Archived from the original on 24 August 2010. Retrieved 24 August 2010.
  36. ↑ Pamela Engel (24 March 2013). "Saplings from Anne Frank's tree take root in US" . Retrieved 26 July 2018– via Yahoo News.
  37. ↑ "Thujoy Khreshchatyk". Why Kyivans miss chestnuts and how they became a symbol of the capital, Ukrayinska Pravda (29 May 2019) (in Ukrainian)
  38. ↑ "Extent of the bleeding canker of horse chestnut problem". UK Forestry Commission. Archived from the original on 2009-12-09. Retrieved 2010-01-09.
  39. 1 2 "Horse chestnut pest and disease problems". www.suffolkcoastal.gov.uk. Archived from the original on 23 September 2011. Retrieved 15 January 2022.
  40. ↑ "Other common pest and disease problems of horse chestnut". UK Forestry Commission. Archived from the original on 2009-12-09. Retrieved 2010-01-09.
  41. ↑ "Bleeding Canker". Royal Horticultural Society. 11 November 2009. Archived from the original on 16 January 2010. Retrieved 2010-01-09.
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