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Genus Phalaris
- a genus of grasses with broad leaves and a dense spike of flowers
Genus Phleum
- grasses native to temperate regions
Genus Phragmites
- reeds of marshes and riversides in tropical or temperate regions
Genus Poa
- chiefly perennial grasses of cool temperate regions
Genus Saccharum
- tall perennial reedlike grass originally of southeastern Asia: sugarcane
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