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Quercus palustris
''Quercus palustris'', the pin oak or swamp Spanish oak, is an oak in the red oak section ''Quercus'' sect. ''Lobatae''. Pin Oak is one of the most commonly used landscaping oak in its native range due to its ease of transplant, relatively fast growth, and pollution tolerance.〔 Its distinctive shape is considered unique among hardwoods.〔〔"Oak, Pin Quercus palustris", http://www.arborday.org/treeguide/TreeDetail.cfm?id=19〕〔"Pin Oak", http://www.treehelp.com/pin-oak/〕
==Distribution==
''Quercus palustris'' is mainly distributed in the eastern and central United States from Connecticut west to eastern Kansas, and south to Georgia, west to eastern Oklahoma and Kansas.〔(Biota of North America Program 2014 county distribution map )〕 It is also native in the extreme south of Ontario, Canada. The pin oak is also well adapted to life in Australia (where it has been introduced) and is quite widespread across the Australian continent especially in the cooler southern States such as Victoria and New South Wales. Is also well adapted to life in Argentina, especially in the Río de la Plata region.
Pin oak grows primarily on level or nearly level, poorly drained alluvial floodplain and river bottom soils with high clay content. Pin oak is usually found on sites that flood intermittently during the dormant season but do not ordinarily flood during the growing season. It does not grow on the lowest, most poorly drained sites that may be covered with standing water through much of the growing season. However, it does grow extensively on poorly drained upland "pin oak flats" on the glacial till plains of southwestern Ohio, southern Illinois and Indiana, and northern Missouri. The level topography and presence of a claypan in the soil of these areas cause these sites to be excessively wet in winter and spring.〔McQuilkin, Robert A. "Quercus palustris Muenchh". http://www.na.fs.fed.us/spfo/pubs/silvics_manual/volume_2/quercus/palustris.htm, accessed September 25, 2014.〕
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