Festuca rubra

The scientific name of a range of subspecies of grass, including:
ssp arctica, Arctic fescue.
ssp arenaria, Sand fescue.
ssp commutata, Chewings fescue.
ssp litoralis, Slender creeping red fescue.
ssp megastachys, Fine fescue.
ssp multiflora, Fine fescue.
ssp pruinosa, Bloomed fescue, although also called Slender creeping red fescue.
ssp rubra, Strong creeping red fescue.
Field Brome

A rare Annual grass, with the scientific name of Bromus arvensis. The leaf is Flat or rolled, having a typical width of 2-5mm. The Ligule is Membranous, being 2-4mm in length; Auricle?: No. Growth type is Tufted.
Fine Fescue

There are two subspecies called this name, both are uncommon Perennial grasses. Their scientific names are: Festuca rubra subspecies megastachys; and Festuca rubra ssp multiflora. They are very similar in that they do not have an Auricle; Their growth type is Rhizomatous, and both have Bristle like leaves and Membranous Ligules. The leaf width of subspecies megastachys is typically 0.5-1.2mm, with the ligule being 0.5mm in length; whilst the leaf width of subspecies multiflora is typically 0.6-1.5mm, with the ligule being 0.3mm in length.
Fine Leaved Sheep's Fescue

A common Perennial grass, with the scientific name of Festuca filiformis (formerly F. tenuifolia) The leaf is Bristle, having a typical width of 0.2-0.4mm. The Ligule is Membranous, being 0.5mm in length; Auricle?: No. Growth type is Tufted.
Flattened Meadow Grass

A common Perennial grass, with the scientific name of Poa compressa. The leaf is Flat or rolled, having a typical width of 1-4mm. The Ligule is Membranous, being 0.5-3mm in length; Auricle?: No. Growth type is Rhizomatous.
Floating Sweet-Grass

A common Perennial grass, with the scientific name of Glyceria fluitans. The leaf is Flat or rolled, having a typical width of 3-10mm. The Ligule is Membranous, being 5-15mm in length; Auricle?: No. Growth type is Tufted.
French Oat-Grass

An uncommon Annual grass, with the scientific name of Gaudinia fragilis. The leaf is Flat or rolled, having a typical width of 2-2.5mm. The Ligule is Membranous, being 0.5mm in length; Auricle?: No. Growth type is Tufted.
Gastridium ventricosum

The scientific name for Nit-grass.
Gaudinia fragilis

The scientific name for French oat-grass.
Giant Fescue

A common Perennial grass, with the scientific name of Schedonorus giganteus (previously called Festuca gigantea). The leaf is Flat or rolled, having a typical width of 6-18mm. The Ligule is Membranous, being 2.5mm in length; Auricle?: Yes. Growth type is Tufted.