(Maclura pomifera)
Maclura pomifera, commonly known as the Osage orange, bois d'arc, horse apple, hedge, or hedge apple tree, is a small deciduous tree or large shrub, typically growing about 8 to 15 metres (30–50 ft) tall. The distinctive fruit, a multiple fruit, is roughly spherical, bumpy, 8 to 15 centimetres (3–6 in) 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, giving it distinction as an anachronistic "ghost of evolution". Maclura pomifera has been known by a variety of English common names in addition to Osage orange, including mock orange, hedge apple, horse apple, monkey ball, monkey brains and yellow-wood; while the French common name bois d'arc ("bow-wood") has been corrupted into the English forms bodark and bodock. 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 The thorny Osage orange tree was widely naturalized throughout the United States until this usage was superseded by the invention of barbed wire in 1874. 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".