Pecan

Pecan
Pecan orchard Lyndon B. Johnson National Historical Park
Conservation status
Secure
Scientific classification
Kingdom: Plantae Division: Magnoliophyta Class: Magnoliopsida Order: Fagales Family: Juglandaceae Genus: Carya Species: C. illinoinensis
Binomial name
Carya illinoinensis (Wangenh.) K.Koch

Pecan is the common name for a large, North American deciduous hickory tree, Carya illinoinensis, characterized by alternate, pinnately compound leaves, deeply furrowed bark, and an edible, oval nut. The term also is used to refer to this smooth, thin-shelled nut of commercial importance.

Description

The pecan is a member of the walnut family, Juglandaceae. Members of Juglandaceae have large aromatic leaves, that are usually alternate, but opposite in members of Alfaroa and Oreomunnia. The leaves are pinnately compound, or ternate, and usually 20-100 centimeters long. The trees are wind-pollinated, the flowers usually arranged in catkins, and the fruit is a true botanical nut.

File:Platycarya strobilacea1.jpg

Foliage and seed catkin of Platycarya strobilacea

Trees in the Carya genus are commonly known as "hickory." The genus includes 17-19 species of deciduous trees with pinnately compound leaves and large nuts. Hickory flowers are small yellow-green catkins produced in spring. They are anemophilous and self-incompatible. The fruit is a globose or oval nut, 2–5 centimeters long and 1.5–3 centimeters 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 C. illinoinensis; It is divided into two halves that split apart when the seed germinates.

Carya illinoinensis (commonly misspelled illinoensis), known as the pecan, is native to south-central North America, in the United States from southern Iowa, Illinois, and Indiana east to western Kentucky and western Tennessee, south through Oklahoma, Arkansas, to Texas, Mississippi, and Louisiana; and in Mexico from Coahuila south to Jalisco and Veracruz (GRIN; FNA).

Ripe pecan nuts on tree

The pecan is a large deciduous tree, growing to 20–40 meters in height (rarely to 44 meters (FNA); taller trees to 50–55 meters have been claimed but not verified), with a trunk up to 2 meters diameter. The leaves are alternate, 40–70 centimeters long, and pinnate with 9–17 leaflets, each leaflet 1-2 centimeters long and 2–7 centimeters broad. As characteristic of the genus, the flowers are wind-pollinated, and monoecious, with staminate and pistillate catkins on the same tree; the male catkins are pendulous, up to 18 centimeters long; the female catkins are small, with three to six flowers clustered together. The pecan fruit is an oval to oblong nut, 2.6–6 centimeters long and 1.5–3 centimeters broad, dark brown with a rough husk 3–4 millimeters thick, which splits off in four sections at maturity to release the thin-shelled nut (FNA; OBS; Collingwood et al. 1964).

The word pecan is from the Algonquin language, meaning "any nut requiring a stone to crack" (GVPC). The pronunciation of pecan is a source of friendly dispute among aficionados. Some people say [pə.ˈkɑn], while others say [ˈpiː.kæn].

History and cultivation

Pecans first became known to Europeans in the 16th century. The Spanish explorer Cabeza de Vaca saw and wrote first about this plant. The Spaniards brought the pecan into Europe, Asia, and Africa beginning in the 16th century.

Male catkins in spring

Pecans with and without shells

Pecan at Piiholo, Maui, Hawaii

Pecans were one of the most recently domesticated major crops. Although wild pecans were well-known among the colonial Americans as a delicacy, the commercial growing of pecans in the United States did not begin until the 1880s (Ree 2006).

Today, the U.S. produces between 80% and 95% of the world's pecans, with an annual crop of 150–200 thousand tons (TPGA 2002). The nut harvest for growers is typically around mid-October. Historically, the leading Pecan-producing state in the U.S. has been Georgia, followed by Texas, New Mexico, and Oklahoma; they are also grown in Arizona and Hawaii. Outside the United States, pecans are grown in Australia, Brazil, China, Israel, Mexico, Peru, and South Africa. They can be grown approximately from USDA hardiness zones 5 to 9, provided summers are also hot and humid.

Pecan trees may live and bear edible nuts for more than three hundred years. They are mostly self-incompatible, because most cultivars, being clones derived from wild trees, show incomplete dichogamy. Generally, two or more trees of different cultivars must be present to pollenize each other.

Culinary, medicinal, and other uses

Pecans Nutritional value per 100 g
Energy 690 kcal   2890 kJ
Carbohydrates     14 g - Dietary fiber  10 g   Fat 72 g - saturated  6 g - monounsaturated  41 g   - polyunsaturated  22 g   Protein 9 g

The nuts of the Pecan are edible, with a rich, buttery flavor. They can be eaten fresh or used in cooking, particularly in sweet desserts but also in some savory dishes. One of the most common desserts with the pecan as a central ingredient is the pecan pie, a traditional southern U.S. recipe. Pecans are also a major ingredient in praline candy, most often associated with New Orleans.

In addition to the pecan nut, the wood is also used in making furniture, in hardwood flooring, as well as flavoring fuel for smoking meats.

Pecans are a good source of protein and unsaturated fats. A diet rich in nuts can lower the risk of gallstones in women. The antioxidants and plant sterols found in pecans reduce high cholesterol by reducing the "bad" LDL cholesterol levels.

Clinical research published in the Journal of Nutrition (September 2001) found that eating about a handful of pecans each day may help lower cholesterol levels similar to what is often seen with cholesterol-lowering medications. Research conducted at the University of Georgia has also confirmed that pecans contain plant sterols, which are known for their cholesterol-lowering ability.

The U.S. Food and Drug Administration (FDA) has acknowledged this and related research and approved the following qualified health claim: "Scientific evidence suggests, but does not prove, that eating 1.5 ounces per day of most nuts, such as pecans, as part of a diet low in saturated fat and cholesterol, may reduce the risk of heart disease." "This nut is an important source of ellagic acid. Pecan nuts are a good low fat source of vitamin E and also have anti-cancer effects. They can also, if eaten correctly, lead to lower cholesterol levels."

A large Pecan tree in downtown Abilene, Texas.

References

ISBN links support NWE through referral fees

tonnes.

• Green Valley Pecan Company. n.d. History of pecans. Green Valley Pecan Company. Retrieved April 13, 2008.

External links

• National Pecan Shellers Association
• Carya illinoinensis images at bioimages.vanderbilt.edu
• National Center for Home Food Preservation — Home Preservation of Pecans
• USDA Forest Service: Carya illinoensis

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