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"National Agricultural Library. Originally from US Forest Service. United States, DC, Washington."   cc-by-nc-sa-3.0

Juglans nigra (Black Walnut) is a species of tree in the family Juglandaceae. It has a self-supporting growth form. It is native to North America, eastern north america, the contiguous United States, Canada, and United States (USA). Black Walnut has compound, broad leaves and yellow flowers. It is a photoautotroph.

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EOL has data for 90 attributes, including:

Known occurrences, collected specimens and observations of black walnut
"National Agricultural Library. Originally from US Forest Service. United States, DC, Washington."   cc-by-nc-sa-3.0