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Knees with very little taper A bald cypress exhibiting tapered knees. A cypress knee is a distinctive structure forming above the roots of a cypress tree of any of various species of the subfamily Taxodioideae, such as the bald cypress. Their function is unknown, but they are generally seen on trees growing in swamps.
Members of the subfamily Taxodioideae produce woody above-ground structures, known as cypress knees, that project upward from their horizontal roots. One hypothesis suggests that these structures function as pneumatophores, facilitating gas exchange in waterlogged soils.
Taxodium distichum (baldcypress, [3] [4] [5] bald-cypress, [6] bald cypress, swamp cypress; French: cyprès chauve; cipre in Louisiana) is a deciduous conifer in the family Cupressaceae. It is native to the southeastern United States. Hardy and tough, this tree adapts to a wide range of soil types, whether wet, salty, dry, or swampy.
Aerating roots (or knee root or knee or pneumatophores): roots rising above the ground, especially above water such as in some mangrove genera (Avicennia, Sonneratia). In some plants like Avicennia the erect roots have a large number of breathing pores for exchange of gases.
Grown - The term "grown knees" refers to any knee which is made from a natural crook or bend in a tree. Grown knees can be taken from several locations within a tree. The roots are a particularly useful source as the root structure of many species of trees naturally spreads out laterally just beneath the ground in order to help anchor the tree.
Unlike bald cypress and pond cypress, Montezuma cypress rarely produces cypress knees from the roots. [3] Trees from the Mexican highlands achieve a notable stoutness. One specimen, the Árbol del Tule in Santa María del Tule, Oaxaca, Mexico, is the stoutest tree in the world with a diameter of 11.42 m (37.5 ft). Several other specimens from 3 ...
Their rapid, thick growth means they are sometimes used to achieve privacy, but such use can result in disputes with neighbours whose own property becomes overshadowed. [3] The tree is a hybrid of Monterey cypress (Cupressus macrocarpa) and Nootka cypress (Cupressus nootkatensis). It is almost always sterile, and is propagated mainly by cuttings.
Hesperocyparis arizonica was given its first scientific name and described by Edward Lee Greene in 1882 as Cupressus arizonica, placing it in genus Cupressus. [3] [5] This description was soon after disputed by Maxwell T. Masters who, in 1896, published a journal article where he said it should be considered a subspecies of Cupressus benthamii with the variety name of arizonica. [3]