Osage orange

''Maclura pomifera'', commonly known as the Osage orange ( ), is a small deciduous tree or large shrub, native to the south-central United States. It typically grows about tall. The distinctive fruit, a multiple fruit, is roughly spherical, bumpy, in diameter, and turns bright yellow-green in the fall. The fruits secrete a sticky white latex when cut or damaged. Despite the name "Osage orange", it is not related to the orange. It is a member of the mulberry family, Moraceae. Due to its latex secretions and woody pulp, the fruit is typically not eaten by humans and rarely by foraging animals. Controversial suggestions have been made that it was consumed by extinct Pleistocene megafauna, but these claims have been criticised as lacking empirical evidence.

''Maclura pomifera'' has many names, including mock orange, hedge apple, hedge, horse apple, monkey ball, monkey brains and yellow-wood. The name bois d'arc (from French meaning "bow-wood") has also been corrupted into ''bodark'' and ''bodock''.

History

The earliest account of the tree in the English language was given by William Dunbar, a Scottish explorer, in his narrative of a journey made in 1804 from St. Catherine's Landing on the Mississippi River to the Ouachita River. Meriwether Lewis sent some slips and cuttings of the curiosity to President Jefferson in March 1804. According to Lewis's letter, the samples were donated by "Mr. Peter Choteau, who resided the greater portion of his time for many years with the Osage Nation". (Note: This referred to Pierre Chouteau, a fur trader from Saint Louis.) Those cuttings did not survive. In 1810, Bradbury relates that he found two ''Maclura pomifera'' trees growing in the garden of Pierre Chouteau, one of the first settlers of Saint Louis, apparently the same person.

American settlers used the Osage orange (i.e. "hedge apple") as a hedge to exclude free-range livestock from vegetable gardens and corn fields. Under severe pruning, the hedge apple sprouted abundant adventitious shoots from its base; as these shoots grew, they became interwoven and formed a dense, thorny barrier hedge. The thorny Osage orange tree was widely naturalized throughout the United States until this usage was superseded by the invention of barbed wire in 1874."Osage Oranges Take a Bough"
''Smithsonian Magazine'', March 2004, p. 35. By providing a barrier that was "horse-high, bull-strong, and pig-tight", Osage orange hedges provided the "crucial stop-gap measure for westward expansion until the introduction of barbed wire a few decades later".

The trees were named ("bow-wood") by early French settlers who observed the wood being used for war clubs and bow-making by Native Americans. Meriwether Lewis was told that the people of the Osage Nation, "So much ... esteem the wood of this tree for the purpose of making their bows, that they travel many hundreds of miles in quest of it." The trees are also known as "bodark", "bodarc", or "bodock" trees, most likely originating as a transliteration or corruption of .

The Comanche also used this wood for their bows. They liked the wood because it was strong, flexible and durable, and the bush/tree was common along river bottoms of the Comanchería. Some historians believe that the high value this wood had to Native Americans throughout North America for the making of bows, along with its small natural range, contributed to the great wealth of the Spiroan Mississippian culture that controlled all the land in which these trees grew.

Etymology

The genus ''Maclura'' is named in honor of William Maclure (1763–1840), a Scottish-born American geologist. The specific epithet ''pomifera'' means "fruit-bearing". The common name ''Osage'' derives from Osage Native Americans from whom young plants were first obtained, as told in the notes of Meriwether Lewis in 1804.

Description

General habit

Mature trees range from tall with short trunks and round-topped canopies. The roots are thick, fleshy, and covered with bright orange bark. The tree's mature bark is dark, deeply furrowed and scaly. The plant has significant potential to invade unmanaged habitats.

The wood of ''M. pomifera'' is golden to bright yellow but fades to medium brown with ultraviolet light exposure. The wood is heavy, hard, strong, and flexible, capable of receiving a fine polish and very durable in contact with the ground. It has a specific gravity of 0.7736 or .

Leaves and branches

Leaves are arranged alternately in a slender growing shoot long. In form they are simple, a long oval terminating in a slender point. The leaves are long and wide, and are thick, firm, dark green, shining above, and paler green below when full grown. In autumn they turn bright yellow. The leaf axils contain formidable spines which when mature are about long.

Branchlets are at first bright green and pubescent; during their first winter they become light brown tinged with orange, and later they become a paler orange brown. Branches contain a yellow pith, and are armed with stout, straight, axillary spines. During the winter, the branches bear lateral buds that are depressed-globular, partly immersed in the bark, and pale chestnut brown in color.

Flowers and fruit

As a dioecious plant, the inconspicuous pistillate (female) and staminate (male) flowers are found on different trees. Staminate flowers are pale green, small, and arranged in racemes borne on long, slender, drooping peduncles developed from the axils of crowded leaves on the spur-like branchlets of the previous year. They feature a hairy, four-lobed calyx; the four stamens are inserted opposite the lobes of calyx, on the margin of a thin disk. Pistillate flowers are borne in a dense spherical many-flowered head which appears on a short stout peduncle from the axils of the current year's growth. Each flower has a hairy four-lobed calyx with thick, concave lobes that invest the ovary and enclose the fruit. Ovaries are superior, ovate, compressed, green, and crowned by a long slender style covered with white stigmatic hairs. The ovule is solitary.

The mature multiple fruit's size and general appearance resembles a large, yellow-green orange (the fruit), about in diameter, with a roughened and tuberculated surface. The compound (or multiple) fruit is a syncarp of numerous small drupes, in which the carpels (ovaries) have grown together; thus, it is classified a multiple-accessory fruit. Each small drupe is oblong, compressed and rounded; they contain a milky latex which oozes when the fruit is damaged or cut. The seeds are oblong. Although the flowering is dioecious, the pistillate tree when isolated will still bear large oranges, perfect to the sight but lacking the seeds. The fruit has a cucumber-like flavor.

File:Maclura pomifera 001.JPG, Mature tree
File:Maclura pomifera 008.jpg, Mature bark
File:Maclura pomifera 002.JPG, Leaves
File:Maclura pomifera 003.JPG, Female inflorescence
File:Osage orange 1.jpg, Mature multiple fruit
File:Osage orange 2.jpg, Multiple fruit, sliced
File:Bodark fruit burrowed into by animal.jpg, Fruit burrowed into by animal eating seeds

Distribution

Osage orange's pre-Columbian range was largely restricted to a small area in what is now the United States, namely the Red River drainage of Oklahoma, Texas, and Arkansas, as well as the Blackland Prairies and post oak savannas. A disjunct population also occurred in the Chisos Mountains of Texas. It has since become widely naturalized in the United States and Ontario, Canada. Osage orange has been planted in all the 48 contiguous states of the United States and in southeastern Canada.

The largest known Osage orange tree is located at the Patrick Henry National Memorial, in Brookneal, Virginia, and is believed to be almost 350 years old. Another historic tree is located on the grounds of Fort Harrod, a Kentucky pioneer settlement in Harrodsburg, Kentucky.

Ecological aspects of historical distribution

Because of the limited original range and lack of obvious effective means of propagation, the Osage orange has been the subject of controversial claims by some authors to be an "evolutionary anachronism", whereby one or more now extinct Pleistocene megafauna evolutionary partners, such as the giant ground sloth, mammoth, mastodon or gomphothere, fed on the fruit and aided in seed dispersal.Connie Barlow
Anachronistic Fruits and the Ghosts Who Haunt Them
. '' Arnoldia'', vol. 61, no. 2 (2001) An equine species that became extinct at the same time also has been suggested as the plant's original dispersal agent because modern horses and other livestock will sometimes eat the fruit. However, a 2015 study indicated that Osage orange seeds are not effectively spread by extant horse or elephant species. The claim has been critcised as a "just-so story" that lacks any empirical evidence.

The fruit is not poisonous to humans or livestock, but is not preferred by them, because it is mostly inedible due to a large size (about the diameter of a softball) and hard, dry texture. The edible seeds of the fruit are used by squirrels as food. Large animals such as livestock, which typically would consume fruits and disperse seeds, mainly ignore the fruit.

Ecology

The fruits are consumed by black-tailed deer in Texas, and white-tailed deer and fox squirrels in the Midwest. Crossbills are said to peck the seeds out. Loggerhead shrikes, a declining species in much of North America, use the tree for nesting and cache prey items upon its thorns.

Cultivation

''Maclura pomifera'' prefers a deep and fertile soil, but is hardy over most of the contiguous United States, where it is used as a hedge. It must be regularly pruned to keep it in bounds, and the shoots of a single year will grow long, making it suitable for coppicing. A neglected hedge will become fruit-bearing. It is remarkably free from insect predators and fungal diseases. A thornless male cultivar of the species exists and is vegetatively reproduced for ornamental use. ''M. pomifera'' is cultivated in Italy, the former Yugoslavia, Romania, former USSR, and India.

Chemistry

Osajin and pomiferin are isoflavones present in the wood and fruit in an approximately 1:2 ratio by weight, and in turn comprise 4–6% of the weight of dry fruit and wood samples. Primary components of fresh fruit include pectin (46%), resin (17%), fat (5%), and sugar (before hydrolysis, 5%). The moisture content of fresh fruits is about 80%.

Uses

The Osage orange is commonly used as a tree row windbreak in prairie states, which gives it one of its colloquial names, "hedge apple". It was one of the primary trees used in President Franklin Delano Roosevelt's "Great Plains Shelterbelt" WPA project, which was launched in 1934 as an ambitious plan to modify weather and prevent soil erosion in the Great Plains states; by 1942 it resulted in the planting of 30,233 shelterbelts containing 220 million trees that stretched for . The sharp-thorned trees were also planted as cattle-deterring hedges before the introduction of barbed wire and afterward became an important source of fence posts. In 2001, its wood was used in the construction in Chestertown, Maryland of the schooner ''Sultana'', a replica of .

The heavy, close-grained yellow-orange wood is dense and prized for tool handles, treenails, fence posts, and other applications requiring a strong, dimensionally stable wood that withstands rot. Although its wood is commonly knotty and twisted, straight-grained Osage orange timber makes good bows, as used by Native Americans. John Bradbury, a Scottish botanist who had traveled the interior United States extensively in the early 19th century, reported that a bow made of Osage timber could be traded for a horse and a blanket. Additionally, a yellow-orange dye can be extracted from the wood, which can be used as a substitute for fustic