The Missouri native grass ( Andropogon gerardii ) known as "Big Bluestem" is selected for, and shall be known as, the official grass of the state of Missouri.
Mo. Rev. Stat. § 10.150
Big bluestem, official state grass
Effective: 28 Aug 2007; (L. 2007 H.B. 680)
Official source: Missouri Revisor of Statutes. Reproduced from public-domain Missouri statutes; confirm against the official source for the current text. Not legal advice.