The nut produced by the black walnut tree ( Juglans nigra ) known as the "Eastern Black Walnut", is selected for and shall be known as the official tree nut of the state of Missouri.
Mo. Rev. Stat. § 10.100
State tree nut — black walnut
Effective: 28 Aug 1990; (L. 1990 S.B. 749)
Official source: Missouri Revisor of Statutes. Reproduced from public-domain Missouri statutes; confirm against the official source for the current text. Not legal advice.