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English walnut
Juglans regia
This is the species that is used as THE cultivated walnut tree. It has pinnately compound leaves with about 7 alternate leaflets, larger towards the tip or terminal end.
Humans have enjoyed these nuts for so long that in many languages the word for nut is a word for THIS nut. Its original range is long forgotten, but it is grown across Eurasia, with China being the largest exporter for the worldwide market.
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768px-Walnut_tree_(Juglans_regia)_bark,_Schanzengraben_-_Hospitalgraben,_Weimar,_Germany
773px-Juglans_regia_chatons_mâles_Auvers
Juglans_regia_(detail)
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Three-segment_shell_walnuts_Júglans_régia
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1024px-Juglans_regia_2009_G2
juglans-regia-855351_1920
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Learn about this species:

Wikipedia | NC Extension | Plants for a Future | OSU landscape plants | Euforgen | Invasive Species Compendium | PDF | Trees of Stanford | Guide to Growing Walnuts
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