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Quercus fusiformis
''Quercus fusiformis'' (also often referred to as ''Q. virginiana'' var. ''fusiformis''), commonly known as Texas live oak, escarpment live oak, plateau live oak, or plateau oak, is an evergreen or nearly evergreen tree. Its native range includes the Quartz Mountains and Wichita Mountains in southwestern Oklahoma, through Texas, to the Mexican states of Coahuila, Tamaulipas, and Nuevo León.〔(Biota of North America Program 2014 county distribution map )〕〔(Flora of North America, ''Quercus fusiformis'' Small, 1901. Texas live oak )〕
''Quercus fusiformis'' is an evergreen tree in the white oak section of the genus ''Quercus''. It is distinguished from ''Quercus virginiana'' (southern live oak) most easily by the acorns, which are slightly larger and with a more pointed apex. It is also a smaller tree, not exceeding 1 meter (40 inches) in trunk diameter (compared to 2.5 m (75 inches) in diameter in southern live oak), with more erect branching and a less wide crown.〔
Texas live oak is typically found on dry sites, unlike southern live oak, which prefers moister conditions. The tree is generally accepted to be the hardiest evergreen oak, able to withstand very cold winters with minimal leaf burn in areas as cold as USDA zone 6a.
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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