Kentucky coffeetree

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Kentucky coffee tree
Gymnocladus dioicus JPG1a.jpg
Kentucky coffeetree in Harveng, Belgium
Status TNC G5.svg
Secure  (NatureServe) [2]
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Fabales
Family: Fabaceae
Subfamily: Caesalpinioideae
Genus: Gymnocladus
Species:
G. dioicus
Binomial name
Gymnocladus dioicus
Gymnocladus dioicus range map 4.png
Natural range
Synonyms [3]
  • Gymnocladus canadensis Lam.
  • Guilandina dioicaL.
  • Gymnocladus dioicus (L.) K.Koch [Spelling variant]

The Kentucky coffee tree (Gymnocladus dioicus), also known as American coffee berry, Kentucky mahogany, nicker tree, and stump tree, [4] is a tree in the subfamily Caesalpinioideae of the legume family Fabaceae, native to the Midwest, Upper South, Appalachia, and small pockets of New York in the United States and Ontario in Canada. The seed may be roasted and used as a substitute for coffee beans; however, unroasted pods and seeds are toxic. The wood from the tree is used by cabinetmakers and carpenters. It is also planted as a street tree.

Contents

From 1976 to 1994, the Kentucky coffeetree was the state tree of Kentucky, after which the tulip poplar was returned to that designation. [5]

Description

The tree varies from 18 to 21 meters (60–70 feet) high with a spread of 12–15 meters (40–50 feet) and a trunk up to one meter (3 feet) in diameter. The tree grows at a medium rate with height increases of anywhere from 12" to 24" per year. [6] A 10-year-old sapling will stand about 4 meters (13 feet) tall. It usually separates 3 to 4½ meters (10–15 feet) from the ground into three or four divisions which spread slightly and form a narrow pyramidal head; or when crowded by other trees, sending up one tall central branchless shaft to the height of 15–21 m (50–70 ft). Branches are stout, pithy, and blunt; roots are fibrous. [7]

The Kentucky coffeetree is a moderately fast-growing tree, and male trees are often grown in parks and along city streets for ornamental purposes. The tree is typically fairly short-lived, healthy trees living from 100 to 150 years. [8] The Kentucky coffeetree sheds its leaves early during the fall and appears bare for up to 6 months. The naked appearance of the tree is reflected through the Kentucky coffeetree's Greek genus name, which means "naked branch". [9] Like the Sumac, branches are absent of fine spray; smaller branches are thick and lumpish. Because of the absence of smaller branches and its later leafing, the French in Canada named it Chicot, "stubby". The expanding leaves are conspicuous because of the varied colors of the leaflets; the youngest are bright pink, while those which are older vary from green to bronze. [7]

Bark of the Kentucky coffeetree Kentucky Coffee-tree Gymnocladus dioicus 3264px.jpg
Bark of the Kentucky coffeetree
Flowers Kentucky coffee-tree flowers.png
Flowers

The bark is ash-gray and scaly, flaking similarly to black cherry, but more so. The trees are dioecious, and the fruit is a hard-shelled bean in heavy, woody, thick-walled pods filled with sweet, thick, gooey pulp. Pod length ranges from 5 to 10 inches (130 to 250 mm); unfertilized female trees may bear miniature seedless pods. The beans are commonly thought to contain the toxin cytisine, although this has yet to be confirmed in a study. [10]

Fruit Gymnocladus-dioicus.jpg
Fruit

Taxonomy

Gymnocladus is derived from the Ancient Greek κλάδος (kládos) "branch" and γυμνός (gumnós) "naked" and refers to the stout branchlets unclothed with small twigs.

It is one of five species in the genus Gymnocladus, and the only one native to North America; the other four being native to South, Southeast and Eastern Asia.

The name is sometimes hyphenated as 'coffee-tree'; the form 'coffeetree' here is as used officially by the United States Forest Service.

Distribution

The Kentucky coffeetree is considered a rare tree species. "Rare species are those that are so uncommon that they should be monitored to determine whether their populations are becoming threatened." [9] It is widely distributed, but rare.

The tree's native range is limited, occurring from Southern Ontario, Canada and in the United States from Kentucky (where it was first encountered by Europeans) and Connecticut in the east, to Kansas, eastern Nebraska, and southeastern South Dakota in the west, to southern Wisconsin and Michigan [9] in the north, and to northern Louisiana in the south. It is planted as an urban shade tree across the United States and eastern Canada, including California.[ citation needed ] It has a disjunct population in Central New York. [15]

This tree usually occurs as widely dispersed individuals or small colonial groups with interconnected root systems. This tree is found in floodplains and river valleys but is also sometimes seen on rocky hillsides and limestone woods. In the northeastern part of its range, seemingly natural groves of this tree are actually associated with known prehistoric village sites. In some parts of its range, this tree may be used as an indicator of the presence of limestone or of calcareous soils.[ citation needed ]

The Kentucky coffeetree is considered an example of an evolutionary anachronism. [16] [17] The tough, leathery seed pods are too difficult for many extant animals to chew through (in addition to being poisonous) and they are too heavy for either wind or water dispersal. It has been hypothesized that the tree would have been browsed upon by now-extinct mammalian megafauna, [18] which ate the pods and nicked the seeds with their large teeth, aiding in germination. This behavior is seen among African elephants eating Fabaceae relatives in Africa. Because of this, its prehistoric range may have been much larger than it has been in historical times. Today, in the wild, it only grows well in wetlands, and it is thought that only in such wet conditions can the seed pods rot away to allow germination in the absence of large herbivores. [19]

Uses

Kentucky coffeetree (upright trunk) at Minnesota Landscape Arboretum Kentucky coffee tree full.JPG
Kentucky coffeetree (upright trunk) at Minnesota Landscape Arboretum

Cultivation

Gymnocladus dioicus is considered well-suited to urban environments, as it is tolerant of poor soils, has extreme drought tolerance, and is not vulnerable to serious insect infestations or disease problems. [20] It is cultivated by specialty tree plant nurseries as an ornamental tree for planting in gardens and parks. The peculiarly late-emerging and early-dropping leaves, coupled with the fact that the large leaves mean few twigs in the winter profile, make it a tree that is ideal for urban shading where winter sunlight is to be maximized (such as in proximity to solar hot-air systems).

It is often planted because of its unique appearance and interesting character. [7] There are several Kentucky coffeetrees at Mount Vernon, in the gardens along the path leading up to the house of George Washington.

Trees prefer a rich moist soil, such as bottom lands. [7] Their growth is largely unaffected by heat, cold, drought, insects, disease, road salt, ice, and alkaline soil. Kentucky coffeetree is easy to grow from seed. Filing the seedcoat by hand with a small file, and then soaking the seeds in water for 24 hours will ensure rapid germination. Propagation is also easy from dormant root cuttings from December through March.

The Kentucky coffeetree is typically found on "alluvial soils of river and flood plains and nearby terraces". [9] Here it may be locally abundant and form large clonal colonies, reproducing by shoots sprouting from roots. [21]

Food

The beans of the tree were eaten, after roasting, in the Meskwaki (Fox), Ho-Chunk (Winnebago) and Pawnee Native American cultures. [22]

The Meskwaki also drank the roasted ground seeds in a hot beverage similar to coffee. [22] The common name "coffeetree" derives from this latter use of the roasted seeds, which was imitated by settlers because it seemed a substitute for coffee, [23] especially in times of poverty, similar to chicory. The European colonialists, however, considered it inferior to real coffee:

When Kentucky was first settled by the adventurous pioneers from the Atlantic states who commenced their career in the primeval wilderness, almost without the necessaries of life, except as they produced them from the fertile soil, they fancied that they had discovered a substitute for coffee in the seeds of this tree; and accordingly the name of coffee-tree was bestowed upon it. But when communication was established with the sea-ports, they gladly relinquished their Kentucky beverage for the more grateful flavor of the Indian berry; and no use is at present made of it in that manner. [7]

—  Andrew Jackson Downing

The roasted seeds can be eaten like sweet chestnuts. [24] Usefully, the fruits can be collected and picked up from the tree or ground at any time during fall, winter, and spring. [25]

Toxicity

Caution should be used when consuming, as unroasted or only partially roasted beans and pods are considered poisonous and are reputed to contain the alkaloid cytisine. [23] The pods, preserved like those of the tamarind, can be eaten and are slightly aperient (laxative). [26] Many sources claim that roasting the seeds for a certain length of time can reduce or eliminate the cytisine thought to be in them, but this is not based on scientific evidence. There are however, many anecdotal accounts of people drinking a coffee-like drink made from the seeds without suffering any adverse health effects, although most reported the taste to be unpleasant. [10]

The plant is toxic to some animals [27] and may intoxicate dogs. [28]

Culture

In addition to use as a food, the seeds of Kentucky coffeetree were used by Native Americans for ceremonial and recreational purposes. Seeds were used as dice in games of chance that were common in eastern tribes. It is likely that indigenous community members carved patterns on coffeetree seeds used in ceremonial dice games, which also served to scarify the seeds and prepare them for germination. [29] The seeds were also used in jewelry. The importance of the Kentucky coffeetree to Native Americans undoubtedly contributed to its dispersal. [30]

Gymnocladus dioicus is used as a street tree as far north as Québec city, Québec. It resists harsh winters and de-icing salts.

Woodworking

The wood is used both by cabinetmakers and carpenters. It has very little sapwood. [26]

Notable specimens

A specimen with a height of 26 metres (85 ft) was referenced in La Turpinerie, commune of Geay, a short distance from the Charente in south-west France, growing in a typical calcareous soil (see Minutes of Congrès international de sylviculture de Paris, June 1900). Cut during the 20th century, it had a circumference of 2.8 metres (9 ft 2 in) and was the tallest in the country at this time.

A Kentucky coffeetree, said to have been brought to the UK in 1812, stands in Mountsfield Park in the London Borough of Lewisham. [31]

A Kentucky coffeetree found in the Will Rogers Park in Amarillo, Texas has been confirmed to be the largest of its kind in Texas. [32] Texas A&M Forest Service said, has a circumference of 92 inches, a height of 51 feet and a crown spread of 52 feet.

A Kentucky coffeetree lives in Rhode Island in the Roger Williams Park Zoo at 1000 Elmwood Avenue, Providence.

At the U.S. Space & Rocket Center in Huntsville, Alabama, 19 Kentucky coffeetrees are planted in the Apollo courtyard prior to entry into the museum.

In 2022, the Tree Board for the town of Hillsborough, North Carolina, selected a grove of Kentucky coffeetrees as its 2022 Treasure Tree. Originally the grove was mis-identified as a part of a program to remove invasive species, but the North Carolina Forest Service helped to confirm the proper identification of the trees. [33]

The largest Kentucky coffeetree in New Hampshire, at 91 ft tall, is on the campus of Dartmouth College. [34]

Related Research Articles

<span class="mw-page-title-main">Caesalpinioideae</span> Subfamily of legumes

Caesalpinioideae is a botanical name at the rank of subfamily, placed in the large family Fabaceae or Leguminosae. Its name is formed from the generic name Caesalpinia. It is known also as the peacock flower subfamily. The Caesalpinioideae are mainly trees distributed in the moist tropics, but include such temperate species as the honeylocust and Kentucky coffeetree. It has the following clade-based definition:

The most inclusive crown clade containing Arcoa gonavensisUrb. and Mimosa pudicaL., but not Bobgunnia fistuloides(Harms) J. H. Kirkbr. & Wiersema, Duparquetia orchidaceaBaill., or Poeppigia proceraC.Presl

<span class="mw-page-title-main">Legume</span> Plant in the family Fabaceae

Legumes are plants in the family Fabaceae, or the fruit or seeds of such plants. When used as a dry grain for human consumption, the seeds are also called pulses. Legumes are grown agriculturally, primarily for human consumption, but also as livestock forage and silage, and as soil-enhancing green manure. Well-known legumes include beans, chickpeas, peanuts, lentils, lupins, mesquite, carob, tamarind, alfalfa, and clover. Legumes produce a botanically unique type of fruit – a simple dry fruit that develops from a simple carpel and usually dehisces on two sides.

<i>Cercis canadensis</i> Species of tree

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<i>Senegalia greggii</i> Species of tree

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<i>Gymnocladus</i> Genus of legumes

Gymnocladus is a small genus of leguminous trees. The common name coffeetree is used for this genus. It includes six species native to eastern North America and southeastern Asia.

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<i>Erythrina crista-galli</i> Species of legume

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<i>Senna tora</i> Species of flowering plant

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<i>Prosopis pubescens</i> Species of tree

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<i>Inga feuilleei</i> Species of tree

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<i>Tylosema esculentum</i> Species of flowering plant

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<i>Inga edulis</i> Species of tree

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References

  1. ↑ Carrero, C. (2020). "Gymnocladus dioicus". IUCN Red List of Threatened Species . 2020: e.T62026160A62026162. doi: 10.2305/IUCN.UK.2020-2.RLTS.T62026160A62026162.en .
  2. ↑ NatureServe (2009). "Gymnocladus dioicus". NatureServe Explorer: An online encyclopedia of life, Version 7.1. Arlington, Virginia.{{cite encyclopedia}}: CS1 maint: location missing publisher (link)
  3. ↑ "Gymnocladus dioica (L.) K.Koch — The Plant List". www.theplantlist.org. Retrieved 2020-12-03.
  4. ↑ Beasley, V. (9 August 1999). "Toxicants that Affect the Autonomic Nervous System (and, in some Cases, Voluntary Nerves as Well)" (PDF). Veterinary Toxicology. Ithaca, New York: International Veterinary Information Service. Archived (PDF) from the original on 22 August 2006.
  5. ↑ "Kentucky: Adoption of the Kentucky State Tree". NETSTATE. Retrieved 2013-06-12.
  6. ↑ "Kentucky Coffeetree Tree on the Tree Guide at arborday.org". www.arborday.org. Retrieved 2017-08-11.
  7. 1 2 3 4 5 6 Keeler, Harriet L. (1900). Our Native Trees and How to Identify Them. New York: Charles Scribner's Sons, pp. 109–112.
  8. ↑ "Kentucky Trees: Gymnocladus dioicus (Kentucky Coffeetree), Pea Family (Fabaceae)" (PDF). Cooperative Extension Service, College of Agriculture, University of Kentucky. Archived (PDF) from the original on 24 January 2009.
  9. 1 2 3 4 Barnes, Wagner et al. (1977). Michigan Trees
  10. 1 2 Spaeth, John P.; Thieret, John W. (2004). "Notes on "Coffee" from the Kentucky Coffeetree (Gymnocladusdioicus, Fabaceae)". SIDA, Contributions to Botany. 21 (1): 345–356. ISSN   0036-1488. JSTOR   41969015.
  11. ↑ "Gymnocladus dioicus (Kentucky Coffeetree, Kentucky Coffee Tree) | North Carolina Extension Gardener Plant Toolbox". plants.ces.ncsu.edu. Retrieved 2023-01-06.
  12. 1 2 "Kentucky Coffeetree". Natural Resource Stewardship. Retrieved 2020-04-15.
  13. ↑ Society, Iowa State Horticultural (1910-01-01). Report of the Iowa State Horticultural Society, for the Year ... The State.
  14. ↑ Klingaman, Gerald (February 14, 2003). "University of Arkansas, Division of Agriculture Research and Extension, Plant of the Week, Kentucky Coffee Tree". Kentucky Coffee Tree. University of Arkansas. Retrieved 2016-10-07.
  15. ↑ "Exploring the Native Range of Kentucky Coffeetree". 16 August 2018.
  16. ↑ Gill, Jacquelyn L. (2014-03-01). "Ecological impacts of the late Quaternary megaherbivore extinctions". New Phytologist. 201 (4): 1163–1169. doi:10.1111/nph.12576. ISSN   1469-8137. PMID   24649488.
  17. ↑ Barlow, Connie (2000). The Ghosts of Evolution: Nonsensical Fruit, Missing Partners, and Other Ecological Anachronisms . New York: Basic Books. ISBN   978-0-465-00551-2.
  18. ↑ Zaya, D.N., Howe, H.F. The anomalous Kentucky coffeetree: megafaunal fruit sinking to extinction?. Oecologia 161, 221–226 (2009). https://doi.org/10.1007/s00442-009-1372-3
  19. ↑ Bronaugh, Whit (2010). "The Trees That Miss The Mammoths". American Forests. 115 (Winter): 38–43.
  20. ↑ Carstens, J.D.; Schmitz, A.P. 2017. Kentucky coffeetree, Gymnocladus dioicus (L.) K. Koch: Current abundance in nature and prospective persistence. In: Sniezko, Richard A.; Man, Gary; Hipkins, Valerie; Woeste, Keith; Gwaze, David; Kliejunas, John T.; McTeague, Brianna A., tech. cords. 2017. Gene conservation of tree species—banking on the future. Proceedings of a workshop. Gen. Tech. Rep. PNW-GTR-963. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. p. 92.
  21. ↑ Stubbendieck, James L.; Milby, Jessica L (2021). Legumes of the Great Plains an illustrated guide. Lincoln: U of Nebraska Press. p. 17. ISBN   978-1496224583.
  22. 1 2 Moerman, Dan. "Native American Ethnobotany Database". Native American Ethnobotany Database. University of Michigan. Retrieved 9 August 2014.
  23. 1 2 "Kentucky Coffeetree (Gymnocladus Dioicus)" (PDF). US Dept of Agriculture. Retrieved 23 October 2012.
  24. ↑ "Gymnocladus dioica Kentucky Coffee Tree PFAF Plant Database".
  25. ↑ The Woody Plant Seed Manual. U.S. Department of Agriculture, Forest Service. 2008. p. 578. ISBN   978-0-16-081131-9.
  26. 1 2 Gilman, D. C.; Peck, H. T.; Colby, F. M., eds. (1905). "Gymnocladus"  . New International Encyclopedia (1st ed.). New York: Dodd, Mead.
  27. ↑ "Kentucky Coffee Tree – Plants toxic to animals – Veterinary Medicine library at U of Illinois". uiuc.edu. Archived from the original on 2008-07-06. Retrieved 2008-05-30.
  28. ↑ Troxel, Mark T.; Poppenga, Robert H. (2005). "Kentucky Coffee Tree Intoxication in a Dog with Cerebellovestibular Signs, Bradycardia, Hypotension, and Hypoglycemia". Journal of Veterinary Internal Medicine. 19 (4): 599–601. doi:10.1892/0891-6640(2005)19[599:kctiia]2.0.co;2. PMID   16095181.
  29. ↑ "Kentucky Coffeetree". Silver Run Forest Farm. Retrieved 2023-02-03.
  30. ↑ VanNatta, Andrew R. (2009). "Ecological Importance of Native Americans Culture to the Kentucky Coffee Tree (Gymnocladus dioicus)" (PDF). University of Wisconsin Stevens Point. Retrieved 2013-07-17.
  31. ↑ "London Gardens Online". London Gardens Online. 1905-08-07. Archived from the original on 2016-03-04. Retrieved 2013-07-15.
  32. ↑ "Kentucky coffeetree in Amarillo confirmed to be largest of its kind in Texas". 2016-01-11.
  33. ↑ "Tree Board Spotlights Kentucky Coffeetree Grove". www.hillsboroughnc.gov. Archived from the original on 2022-05-18. Retrieved 2022-06-05.
  34. ↑ https://unhcoopext.maps.arcgis.com/apps/Shortlist/index.html?appid=bc24f6238db1475e9d6bc3ef2d061c0f New Hampshire Big Tree Map

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