Juglans cinerea

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Juglans cinerea

E. North America

Location: map coordinates N-16 (north of Thomasson Building),
N 39°11'10'' W 75°32'39''

Planting history: planted November 2010. Source: Go Native Tree Farm, PA. (Dr. S. Yost, USDA NIFA Capacity Building Grant funds).

  • deciduous tree
  • etymology: Juglans from the Latin name for Juglans regia (from jovis [Jupiter] and glans [nut]); cinerea = grey (referring to the bark)
  • also called white walnut
  • leaf compound; leaflets (7) 11-17
  • monoecious (separate male and female flowers on same tree); flowers small; male flowers in catkins
  • fruits large, more oblong than black walnut; husk greenish-brown; nut ridged and long-pointed; seed edible, sweet; husks and inner bark used for dye (e.g. Civil War uniforms)
  • pith chambered
  • looks similar to black walnut Juglans nigra, but leaf scar has prominent hairy margin above, end leaflet normally present, and pith dark brown
  • allelopathic; contains juglone (as does black walnut), toxic to many other plants
  • wood less valuable than black walnut
  • many trees have been killed by a fungus disease, butternut decline or butternut canker

Native species, State Rank S3 (uncommon, but not of conservation concern, yet) in New Castle County piedmont, Delaware

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