Schedonorus arundinaceus 
The scientific name for the grass Tall fescue.
Schedonorus giganteus
The scientific name for the grass Giant fescue.
Schedonorus pratensis
The scientific name for the grass Meadow fescue.
Scottish Small-Reed
A rare Perennial grass, with the scientific name of Calamagrostis scotica. The leaf is Flat or rolled, having a typical width of 2-5mm. The Ligule is Membranous, being 3mm in length; Auricle?: No. Growth type is Rhizomatous.
Sea Barley
A common Annual grass, with the scientific name of Hordeum marinum. The leaf is Flat or rolled, having a typical width of 1-3.5mm. The Ligule is Membranous, being 1mm in length; Auricle?: Yes. Growth type is Tufted.
Sea Couch
A common Perennial grass, with the scientific name of Elymus athericus. The leaf is Flat or rolled, having a typical width of 2-6mm. The Ligule is Membranous, being 1mm in length; Auricle?: Yes. Growth type is Rhizomatous.
Sea Fern-Grass
A common Annual grass, with the scientific name of Catapodium marinum. The leaf is Flat or rolled, having a typical width of 4-12mm. The Ligule is Membranous, being 0.5-3mm in length; Auricle?: No. Growth type is Tufted.
Seashore Paspalum
A warm season species of grass. Its scientific name is Paspalum vaginatum.
Secale cereale
The scientific name for the grass Rye, a cereal crop.
Sesleria caerulea