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A '''nut''' in [[botany]] is a ''simple dry [[fruit]]'' with one [[seed]] (rarely two) in which the [[ovary (plants)|ovary]] wall becomes very hard (stony or woody) at maturity, and where the seed remains unattached or unfused with the ovary wall.  Most nuts come from [[carpel|pistils]] with ''inferior'' ovaries (see [[flower]]) and all are ''indehiscent'' (not opening at maturity).  True nuts are produced, for example, by some plants — families of the [[order (biology)|order]] [[Fagales]].
 
A '''nut''' in [[botany]] is a ''simple dry [[fruit]]'' with one [[seed]] (rarely two) in which the [[ovary (plants)|ovary]] wall becomes very hard (stony or woody) at maturity, and where the seed remains unattached or unfused with the ovary wall.  Most nuts come from [[carpel|pistils]] with ''inferior'' ovaries (see [[flower]]) and all are ''indehiscent'' (not opening at maturity).  True nuts are produced, for example, by some plants — families of the [[order (biology)|order]] [[Fagales]].
;Order Fagales
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;Order [[Fagales]]
 
*Family [[Juglandaceae]]  
 
*Family [[Juglandaceae]]  
** [[Walnut]] - esp. [[Juglans regia|'''Persian Walnut''' (''Juglans regia'')]]
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** [[Walnut]] - esp. [[Juglans regia]], the '''[[Persian Walnut]]'''
** [[Butternut (tree)|Butternut]] (''Juglans'')
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** [[Butternut]] (''[[Juglans]]'')
** [[Hickory]], [[Pecan]] (''Carya'')
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** [[Hickory]], [[Pecan]] (''[[Carya]]'')
** [[Wingnut]] (''Pterocarya'')
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** [[Wingnut]] (''[[Pterocarya]]'')
 
* Family [[Fagaceae]]
 
* Family [[Fagaceae]]
** [[Chestnut]] (''Castanea'')
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** [[Chestnut]] (''[[Castanea]]'')
** [[Beech]] (''Fagus'')
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** [[Beech]] (''[[Fagus]]'')
** [[Oak]] (''Quercus'')
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** [[Oak]] (''[[Quercus]]'')
** [[Lithocarpus|Stone-oak]], [[Tanoak]] (''Lithocarpus'')
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** [[Stone-oak]], [[Tanoak]] (''[[Lithocarpus]]'')
 
* Family [[Betulaceae]]
 
* Family [[Betulaceae]]
** [[Alder]] (''Alnus'')
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** [[Alder]] (''[[Alnus]]'')
** [[Birch]] (''Betula'')
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** [[Birch]] (''[[Betula]]'')
** [[Hazel]], [[Filbert]] (''Corylus'')
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** [[Hazel]], [[Filbert]] (''[[Corylus]]'')
 
** [[Hornbeam]]
 
** [[Hornbeam]]
  
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