Hickory

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Hickory
Temporal range: 85.8–0  Ma
Carya Morton 29-U-10.jpg
Hickory at Morton Arboretum
Accession 29-U-10
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Fagales
Family: Juglandaceae
Subfamily: Juglandoideae
Tribe: Juglandeae
Subtribe: Caryinae
Genus: Carya
Nutt.
Type species
Carya tomentosa
(Poir.) Nutt. [2]

Hickory is a common name for trees composing the genus Carya, which includes 19 species accepted by Plants of the World Online . [3]

Contents

Seven species are native to southeast Asia in China, Indochina, and northeastern India (Assam), and twelve are native to North America. A number of hickory species are used for their edible nuts or for their wood.

Etymology

The name "hickory" derives from a Native American word in an Algonquian language (perhaps Powhatan). It is a shortening of pockerchicory, pocohicora, or a similar word, which may be the name for the hickory tree's nut, or may be a milky drink made from such nuts. [4] The genus name Carya is Ancient Greek : κάρυον, káryon, meaning "nut".

Description

Hickories are temperate to subtropical forest trees with pinnately compound leaves and large nuts. Most are deciduous, but one species (C. sinensis, syn. Annamocarya sinensis) in southeast Asia is evergreen. [5]

Hickory flowers are small, yellow-green catkins produced in spring. They are wind-pollinated and self-incompatible. The fruit is a globose or oval nut, 2–5 cm (0.8–2.0 in) long and 1.5–3 cm (0.6–1.2 in) diameter, enclosed in a four-valved husk, which splits open at maturity. The nut shell is thick and bony in most species, but thin in a few, notably the pecan (C. illinoinensis); it is divided into two halves, which split apart when the seed germinates.

Some fruit are borderline and difficult to categorize. Hickory (Carya) nuts and walnut ( Juglans ) nuts, both in the family Juglandaceae, grow within an outer husk; these fruit are sometimes considered to be drupes or drupaceous nuts, rather than true botanical nuts. "Tryma" is a specialized term for such nut-like drupes. [6] [7] The Angiosperm Phylogeny Group however consider the fruit to be a nut. [8]

Taxonomy

Phylogeny

The oldest fossils attributed to Carya are Cretaceous pollen grains from Mexico and New Mexico. Fossil and molecular data suggest the genus Carya may have diversified during the Miocene. [9] Modern Carya first appear in Oligocene strata 34 million years ago. Recent discoveries of Carya fruit fossils further support the hypothesis that the genus has long been a member of Eastern North American landscapes, however its range has contracted and Carya is no longer extant west of the Rocky Mountains. [10] [11]

Fossils of early hickory nuts show simpler, thinner shells than modern species with the exception of pecans, suggesting that the trees gradually developed defenses to rodent seed predation.[ citation needed ] During this time, the genus had a distribution across the Northern Hemisphere, but the Pleistocene Ice Age beginning 2 million years ago obliterated it from Europe. [12] In Anatolia, the genus appears to have disappeared only in the early Holocene, probably related to human disturbance. [13] The distribution of Carya in North America also contracted and it completely disappeared from the continent west of the Rocky Mountains. It is likely that the genus originated in North America, and later spread to Europe and Asia. [9]

Subdivision

The genus Carya (not to be confused with Careya in the Lecythidaceae) is in the walnut family, Juglandaceae. In the APG system, this family is included in the order Fagales. Several species are known to hybridize, with around nine accepted, named hybrids. [3] [14]

Asian hickories

Carya sect. Sinocarya

Roasted Carya cathayensis (Chinese hickory) Carya cathayensis nuts.jpg
Roasted Carya cathayensis (Chinese hickory)

C. sinensis has sometimes been split out in a separate genus as Annamocarya sinensis, [5] but not by Plants of the World Online, [3] as genetic data support it being embedded within the other Asian Carya. [9]

North American hickories

Carya sect. Carya – typical hickories

Nuts of Carya texana (black hickory) Black hickory in Bastrop County, Texas (cropped).jpg
Nuts of Carya texana (black hickory)
  • Carya floridana Sarg. – scrub hickory
  • Carya glabra (Mill.) Sweet – pignut hickory, pignut, sweet pignut, coast pignut hickory, smoothbark hickory, swamp hickory, broom hickory
  • Carya laciniosa (Mill.) K.Koch – shellbark hickory, shagbark hickory, bigleaf shagbark hickory, kingnut, big shellbark, bottom shellbark, thick shellbark, western shellbark
  • Carya myristiciformis (F.Michx.) Nutt. – nutmeg hickory, swamp hickory, bitter water hickory
  • Carya ovalis (Wangenh.) Sarg. – red hickory, spicebark hickory, sweet pignut hickory (treated as a variety of C. glabra by Flora N. Amer. and Plants of the World Online [3] )
  • Carya ovata (Mill.) K.Koch – shagbark hickory
    • C. o. var. ovata – northern shagbark hickory
    • C. o. var. australis – southern shagbark hickory, Carolina hickory (syn. C. carolinae-septentrionalis)
  • Carya pallida (Ashe) Engl. & Graebn. – sand hickory
  • Carya texana Buckley – black hickory
  • Carya tomentosa (Poir.) Nutt. – mockernut hickory (syn. C. alba)
  • Carya washingtonensis Manchester – Miocene of Kittitas County, Washington

Carya sect. Apocarya – pecans

Foliage of Carya cordiformis (bitternut hickory) Carya cordiformis.jpg
Foliage of Carya cordiformis (bitternut hickory)

Distribution and habitat

Seven species are native to southeast Asia in China, Indochina, and northeastern India (Assam), and twelve are native to North America, of which eleven occur in the United States, four in Mexico (of which one, C. palmeri, endemic there), and five extending into southern Canada. [3] [16] [17]

Ecology

Hickory is used as a food plant by the larvae of some Lepidoptera species. These include:

The hickory leaf stem gall phylloxera ( Phylloxera caryaecaulis) also uses the hickory tree as a food source. Phylloxeridae are related to aphids and have a similarly complex life cycle. Eggs hatch in early spring and the galls quickly form around the developing insects. Phylloxera galls may damage weakened or stressed hickories, but are generally harmless. Deformed leaves and twigs can rain down from the tree in the spring as squirrels break off infected tissue and eat the galls, possibly for the protein content or because the galls are fleshy and tasty to the squirrels. The pecan gall curculio ( Conotrachelus elegans ) is a true weevil species also found feeding on galls of the hickory leaf stem gall phylloxera.

The banded hickory borer (Knulliana cincta) is also found on hickories.

Hickory nuts (Carya spp.), dried
Nutritional value per 100 g (3.5 oz)
Energy 2,749 kJ (657 kcal)
18.25 g
Dietary fiber 6.4 g
Fat
64.37 g
Saturated 7.038 g
Monounsaturated 32.611 g
Polyunsaturated 21.886 g
12.72 g
Tryptophan 0.139 g
Threonine 0.422 g
Isoleucine 0.576 g
Leucine 1.027 g
Lysine 0.497 g
Methionine 0.300 g
Cystine 0.271 g
Phenylalanine 0.713 g
Tyrosine 0.454 g
Valine 0.730 g
Arginine 2.086 g
Histidine 0.389 g
Alanine 0.662 g
Aspartic acid 1.368 g
Glutamic acid 2.885 g
Glycine 0.708 g
Proline 0.571 g
Serine 0.806 g
Vitamins and minerals
Vitamins Quantity
%DV
Vitamin A 131 IU
Thiamine (B1)
72%
0.867 mg
Riboflavin (B2)
10%
0.131 mg
Niacin (B3)
6%
0.907 mg
Pantothenic acid (B5)
35%
1.746 mg
Vitamin B6
11%
0.192 mg
Folate (B9)
10%
40 μg
Vitamin C
2%
2.0 mg
Minerals Quantity
%DV
Calcium
5%
61 mg
Copper
82%
0.738 mg
Iron
12%
2.12 mg
Magnesium
41%
173 mg
Manganese
200%
4.610 mg
Phosphorus
27%
336 mg
Potassium
15%
436 mg
Selenium
15%
8.1 μg
Sodium
0%
1 mg
Zinc
39%
4.31 mg
Other constituentsQuantity
Water2.65 g

Percentages estimated using US recommendations for adults, [18] except for potassium, which is estimated based on expert recommendation from the National Academies. [19]

Uses

Nutrition

Dried hickory nuts are 3% water, 18% carbohydrates, 13% protein, and 64% fats. In a 100 gram (3.5 oz) reference amount, dried hickory nuts supply 657 calories, and are a rich source (20% or more of the Daily Value, DV) of several B vitamins and dietary minerals, especially manganese at 220% DV.

Culinary

An extract from shagbark hickory bark is used in an edible syrup similar to maple syrup, with a slightly bitter, smoky taste. The Cherokee people would produce a green dye from hickory bark, which they used to dye cloth. [20] [21] When this bark was mixed with maple bark, it produced a yellow dye pigment. The ashes of burnt hickory wood were traditionally used to produce a strong lye (potash) fit for soapmaking. [22]

The nuts of some species are palatable, while others are bitter and only suitable for animal feed. Hickory nuts were a significant food source for indigenous peoples of the Eastern Woodlands of North America since the middle Archaic period. They were used by the Cherokee in Kanuchi soup, but more often edible oil would be extracted through crushing the nuts and then either straining or boiling the remains. [23] Shagbark and shellbark hickory, along with pecan, are regarded by some as the finest nut trees. Pecans are the most important nut tree native to North America. [16]

When cultivated for their nuts, clonal (grafted) trees of the same cultivar cannot pollinate each other because of their self-incompatibility. Two or more cultivars must be planted together for successful pollination. Seedlings (grown from hickory nuts) will usually have sufficient genetic variation.

Wood

Finished hickory in a cabinet Finished hickory 1.jpg
Finished hickory in a cabinet

Hickory wood is hard, stiff, dense and shock resistant. There are woods stronger than hickory and woods that are harder, but the combination of strength, toughness, hardness, and stiffness found in hickory wood is not found in any other commercial wood. [24] Hickory is therefore used in a number of items requiring these properties, such as tool handles, bows, wheel spokes, walking sticks, drumsticks and wood flooring. Baseball bats were formerly made of hickory, but are now more commonly made of ash; however, it is replacing ash as the wood of choice for Scottish shinty sticks. Hickory was also extensively used for the construction of early aircraft.

Due to its grain structure, hickory is more susceptible to moisture absorption than other species of wood, and is therefore more prone to shrinkage, warping or swelling with changes in humidity. [25]

Hickory is also highly prized for wood-burning stoves and chimineas, as its density and high energy content make it an efficient fuel. [26] Hickory wood is also a preferred type for smoking cured meats. In the Southern United States, hickory is popular for cooking barbecue, as hickory grows abundantly in the region and adds flavor to the meat.

See also

Related Research Articles

<i>Juglans</i> Genus of trees

Walnut trees are any species of tree in the plant genus Juglans, the type genus of the family Juglandaceae, the seeds of which are referred to as walnuts. All species are deciduous trees, 10–40 metres (33–131 ft) tall, with pinnate leaves 200–900 millimetres (7.9–35.4 in), with 5–25 leaflets; the shoots have chambered pith, a character shared with the wingnuts (Pterocarya), but not the hickories (Carya) in the same family.

<span class="mw-page-title-main">Pecan</span> Species of hickory native to the southern USA and northern Mexico

The pecan is a species of hickory native to the Southern United States and northern Mexico in the region of the Mississippi River.

<span class="mw-page-title-main">Juglandaceae</span> Walnut family of trees

The Juglandaceae are a plant family known as the walnut family. They are trees, or sometimes shrubs, in the order Fagales. Members of this family are native to the Americas, Eurasia, and Southeast Asia.

<i>Carya ovata</i> Species of tree

Carya ovata, the shagbark hickory, is a common hickory native to eastern North America, with two varieties. The trees can grow to quite a large size but are unreliable in their fruit output. The nut is consumed by wildlife and historically by Native Americans, who also used the wood.

Carya sinensis is a species of tree native to southwestern China and northern Vietnam, in the hickory genus Carya. It is sometimes called Chinese hickory or beaked hickory. It is closely related to Carya kweichowensis.

<i>Carya cordiformis</i> Species of tree

Carya cordiformis, the bitternut hickory, also called bitternut, yellowbud hickory, or swamp hickory, is a large hickory species native to the eastern United States and adjacent Canada. Notable for its unique sulphur-yellow buds, it is one of the most widespread hickories and is the northernmost species of pecan hickory. It is the shortest-lived of the hickories, living to about 200 years.

<i>Carya floridana</i> Species of tree

Carya floridana the scrub hickory, is a small tree native to the Southeast United States, where it is endemic to central Florida.

<i>Carya glabra</i> Species of tree

Carya glabra, the pignut hickory, is a common, but not abundant species of hickory in the oak-hickory forest association in the Eastern United States and Canada. Other common names are pignut, sweet pignut, coast pignut hickory, smoothbark hickory, swamp hickory, and broom hickory. The pear-shaped nut ripens in September and October, has a sweet maple like smell, and is an important part of the diet of many wild animals. The wood is used for a variety of products, including fuel for home heating. Its leaves turn yellow in the Fall.

<i>Carya laciniosa</i> Species of tree

Carya laciniosa, the shellbark hickory, in the Juglandaceae or walnut family is also called kingnut, big, bottom, thick, or western shellbark, attesting to some of its characteristics. It is a slow-growing, long-lived tree, hard to transplant because of its long taproot, and subject to insect damage. The nuts, largest of all hickory nuts, are sweet and edible. Wildlife and people harvest most of them; those remaining produce seedling trees readily. The wood is hard, heavy, strong, and very flexible, making it a favored wood for tool handles. A specimen tree has been reported in Missouri with 117 cm (46 in) diameter at breast height, 36.9 m tall, and a spread of 22.6 m.

<i>Carya tomentosa</i> Species of hickory tree

Carya tomentosa, commonly known as mockernut hickory, mockernut, white hickory, whiteheart hickory, hognut, bullnut, is a species of tree in the walnut family Juglandaceae. The most abundant of the hickories, and common in the eastern half of the United States, it is long lived, sometimes reaching the age of 500 years. A straight-growing hickory, a high percentage of its wood is used for products where strength, hardness, and flexibility are needed. The wood makes excellent fuel wood, as well.

<i>Carya aquatica</i> Species of tree

Carya aquatica, the bitter pecan or water hickory, is a large tree, that can grow over 30 metres (98 ft) tall of the Juglandaceae or walnut family. In the American South it is a dominant plant species found on clay flats and backwater areas near streams and rivers. The species reproduces aggressively both by seed and sprouts from roots and from stumps of cut trees. Water hickory is a major component of wetland forests now in the south eastern US, because of the selective cutting of more desirable tree species for the lumber industry. It is considered important in cleansing drainage waters since the plants slow water flow during flooding, allowing sediments to fall out of the water column. This tree species is tolerant of wet soils but grows best on well draining soils near rivers and other water ways.

<i>Carya myristiciformis</i> Species of tree

Carya myristiciformis, the nutmeg hickory, a tree of the Juglandaceae or walnut family, also called swamp hickory or bitter water hickory, is found as small, possibly relict populations across the Southern United States and in northern Mexico on rich moist soils of higher bottom lands and stream banks. Little is known of the growth rate of nutmeg hickory. Logs and lumber are sold mixed with other hickories. The nuts are an oil-rich food for wildlife.

<i>Carya ovalis</i> Species of tree

Carya ovalis, the red hickory or sweet pignut hickory, is a fairly uncommon but widespread hickory native to eastern North America. It is typically found growing in dry, well drained sandy upland ridges and sloped woodlands from southern Ontario, Canada, and in the United States east to New Hampshire, south to northern Florida west to eastern Texas and north-west to Nebraska. This species was formerly treated as a variety or northern ecotype of the pignut hickory C. glabra, described as Carya glabra var. odorata. This discrepancy has not yet been completely resolved, and some sources and authors still consider red hickory as a variety or synonym of pignut hickory. However both trees are quite morphologically distinct.

Oak–hickory forest is a type of North American forest ecosystem, and an ecoregion of the Temperate broadleaf and mixed forests Biome.

<span class="mw-page-title-main">Juglandoideae</span> Subfamily of flowering plants

Juglandoideae is a subfamily of the walnut family Juglandaceae.

Carya washingtonensis is an extinct species of hickory nut in the walnut family Juglandaceae. The species is solely known from the Miocene sediments exposed in Kittitas County near Ellensburg, Washington.

<i>Carya pallida</i> Species of flowering plant

Carya pallida, sand hickory, or pale hickory is a species of hickory native to the southeastern United States. It is a perennial, dicotyledonous plant which prefers rocky or sandy habitats. The sand hickory can reach heights of up to 30m, but its typical height is between 9-24m. In an open area, Carya crowns are usually towering and slim. The sand hickory nut is edible and consumed by various organisms.

<i>Telamona excelsa</i> Species of true bug

Telamona excelsa is a species of treehopper in the family Membracidae. It was first described by Léon Fairmaire in 1846.

Kanuchi, or simply ᎧᏅᏥ, is a hickory nut soup eaten originally by the Cherokee people and which consists primarily of ground hickory nuts boiled in water. Hickory was the nut of choice, since it is a nut tree endemic to North America, and is known to grow plentifully in those forested areas settled by the Cherokee.

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