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|features=deciduous, edible
 
|features=deciduous, edible
 
|Temp Metric=°F
 
|Temp Metric=°F
|image=Walnut twig.jpg
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|image=Walnuss-frucht001.jpg
 
|image_width=240
 
|image_width=240
 
|image_caption=Shoot and nut of ''Juglans regia''
 
|image_caption=Shoot and nut of ''Juglans regia''
 
}}
 
}}
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[[File:Noyer.JPG|thumb|Walnut tree (Juglans regia)]]
 
'''Walnuts''' (genus ''Juglans'') are [[plant]]s in the walnut family [[Juglandaceae]]. They are [[deciduous]] [[tree]]s, 10 - 40 [[metre]]s tall, with [[pinnate]] leaves 200 - 900 millimetres long, with 5 - 25 leaflets; the shoots have chambered [[pith]], a character shared with the [[wingnut]]s (''Pterocarya'') but not the [[hickory|hickories]] (''Carya'') in the same family.  
 
'''Walnuts''' (genus ''Juglans'') are [[plant]]s in the walnut family [[Juglandaceae]]. They are [[deciduous]] [[tree]]s, 10 - 40 [[metre]]s tall, with [[pinnate]] leaves 200 - 900 millimetres long, with 5 - 25 leaflets; the shoots have chambered [[pith]], a character shared with the [[wingnut]]s (''Pterocarya'') but not the [[hickory|hickories]] (''Carya'') in the same family.  
   −
[[Image:Walnut pith.jpg|250px|left|thumb|Walnut shoot cut longitudinally to show chambered [[pith]]. Scale in mm.]]
   
The 21 species in the genus range across the north temperate [[Old World]] from southeast [[Europe]] east to [[Japan]], and more widely in the [[New World]] from southeast [[Canada]] west to [[California]] and south to [[Argentina]]. The Latin name ''Juglans'' derives from ''Jovis glans'', "Jupiter's nuts", the nut fit for a god.
 
The 21 species in the genus range across the north temperate [[Old World]] from southeast [[Europe]] east to [[Japan]], and more widely in the [[New World]] from southeast [[Canada]] west to [[California]] and south to [[Argentina]]. The Latin name ''Juglans'' derives from ''Jovis glans'', "Jupiter's nuts", the nut fit for a god.
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[[Image:Walnut02.jpg|thumb|Persian Walnut nuts]]
 
[[Image:Walnut02.jpg|thumb|Persian Walnut nuts]]
 
[[Image:Walnut03.jpg|thumb|Inside of a Persian Walnut nut with green outer layer visible in the top left corner]]
 
[[Image:Walnut03.jpg|thumb|Inside of a Persian Walnut nut with green outer layer visible in the top left corner]]
[[Image:Walnuts02.jpg|thumb|Persian Walnuts]]
   
The [[nut (fruit)|nuts]] of all the species are edible, but the walnuts commonly available in stores are from the Persian Walnut, the only species which has a large nut and thin shell. A horticultural form selected for thin nut shells and hardiness in temperate zones is sometimes known as the 'Carpathian' walnut. The nuts are rich in [[Walnut oil|oil]], and are widely eaten both fresh and in [[cookery]]. [[Oil paint]] often employs walnut oil as an effective binding medium, known for its clear, glossy consistency and non-toxicity
 
The [[nut (fruit)|nuts]] of all the species are edible, but the walnuts commonly available in stores are from the Persian Walnut, the only species which has a large nut and thin shell. A horticultural form selected for thin nut shells and hardiness in temperate zones is sometimes known as the 'Carpathian' walnut. The nuts are rich in [[Walnut oil|oil]], and are widely eaten both fresh and in [[cookery]]. [[Oil paint]] often employs walnut oil as an effective binding medium, known for its clear, glossy consistency and non-toxicity
 
. Walnuts are also an excellent source of [[omega-3 fatty acids]], and have been shown as helpful in lowering [[cholesterol]]. They need to be kept dry and refrigerated to store well; in warm conditions they become rancid in a few weeks, particularly after shelling.
 
. Walnuts are also an excellent source of [[omega-3 fatty acids]], and have been shown as helpful in lowering [[cholesterol]]. They need to be kept dry and refrigerated to store well; in warm conditions they become rancid in a few weeks, particularly after shelling.

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