Setaria

The genus name for a couple of grasses (5 species) called Bristle-grass.
Setaria pumila, Yellow bristle-grass.
Setaria viridis, Green bristle-grass.
Sheep's Fescue

A common Perennial grass, with the scientific name of Festuca ovina. The leaf is Bristle, having a typical width of 0.3-0.6mm. The Ligule is Membranous, being 0.5mm in length; Auricle?: No. Growth type is Tufted. It is well adapted to dry, sandy, infertile soils, which can be acidic or calcareous. It is only suitable for some low maintenance amenity surfaces.
Silvery Hair-Grass

A common Annual grass, with the scientific name of Aira caryophyllea. The leaf is Bristle, having a typical width of 0.3mm. The Ligule is Membranous, being 4mm in length; Auricle?: No. Growth type is Tufted.
Six-Rowed Barley

An uncommon Annual grass, with the scientific name of Hordeum hexastichon. The leaf is Flat or rolled, having a typical width of 4-15mm. The Ligule is Membranous, being 0.7-1.5mm in length; Auricle?: Yes. Growth type is Tufted.
Slender Creeping Red Fescue

A common Perennial grass, with the scientific name of Festuca rubra ssp litoralis. The leaf is Bristle, having a typical width of 0.5-0.7mm. The Ligule is Membranous, being 0.5mm in length; Auricle?: No. Growth type is Rhizomatous. A turfgrass species which is used in fine turf situations such as golf and bowling greens.
Slender Oat

A rare Annual grass, with the scientific name of Avena barbata. The leaf is Flat or rolled, having a typical width of 5-6mm. The Ligule is Membranous, being 4-6mm in length; Auricle?: No. Growth type is Tufted.
Slender Soft-Brome

A common Annual grass, with the scientific name of Bromus lepidus. The leaf is Flat or rolled, having a typical width of 2-5mm. The Ligule is Membranous, being 1mm in length; Auricle?: No. Growth type is Tufted.
Small Cord-Grass

An uncommon Perennial grass, with the scientific name of Spartina maritima. The leaf is Flat or rolled, having a typical width of 6mm. The Ligule is a Fringe of hairs, being 1mm in length; Auricle?: No. Growth type is Rhizomatous.
Small Sweet-Grass

A common Perennial grass, with the scientific name of Glyceria declinata. The leaf is Flat or rolled, having a typical width of 1.5-8mm. The Ligule is Membranous, being 4-9mm in length; Auricle?: No. Growth type is Tufted.
Smaller Cat's-Tail

A common Perennial grass, with the scientific name of Phleum bertolonii. The leaf is Flat or rolled, having a typical width of 2-5mm. The Ligule is Membranous, being 1-4mm in length; Auricle?: No. Growth type is Stoloniferous.