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Genus Schizachyrium
- overlaps the genus Andropogon
Genus Secale
- cereal grass widely cultivated for its grain: rye
Genus Setaria
- annual or perennial grasses of warm regions: bristlegrasses
Genus Sorghum
- annual or perennial tropical and subtropical cereal grasses: sorghum
Genus Spartina
- grass of freshwater swamps and salt marshes of Europe, Africa, America, and South Atlantic islands
Genus Sporobolus
- cosmopolitan annual and perennial grasses (as dropseed or rush grass)
Genus Triticum
- annual cereal grasses from Mediterranean area; widely cultivated in temperate regions