Cool Season Turfgrass 
Species of turfgrass that grow in cooler climates and which use the C3 pathway of photosynthesis, which is in contrast to warmer climates. The optimum growing temperatures for cool season grasses is typically between 15ËšC and 24ËšC. Examples of the main cool season turfgrass species in the UK are: Common and Highland Bent; Creeping Bent; Perennial Ryegrass; the Red Fescues, and Smooth Stalked Meadow Grass.
Corynephorus canescens
The scientific name for Grey hair-grass.
Couch Grass
A common Perennial grass, with the scientific name of Elymus repens (formerly Agropyron repens). The leaf is Flat or rolled, having a typical width of 3-10mm. The Ligule is Membranous, being 1mm in length; Auricle?: Yes. Growth type is Rhizomatous.
It is uncommon on regularly maintained lawns but might creep in from surrounding borders where a lawn is inadequately and infrequently maintained.
Creeping Bent
A common Perennial grass, with the scientific name of Agrostis stolonifera var. stolonifera. The leaf is Flat or rolled, having a typical width of 0.5-5mm. The Ligule is Membranous, being 1-6mm in length; Auricle?: No. Growth type is Stoloniferous.
It is a grass which is occasionally sown on high sand profile golf greens, where high levels of resources and maintenance inputs are available. The nature of the creeping stoloniferous growth as well as shoot density creates a 'nap' in a sward and this requires increased scarification, verticutting, grooming, mowing and light topdressings to red
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Creeping Meadow Grass
Creeping Soft-Grass
A common Perennial grass, with the scientific name of Holcus mollis. The leaf is Flat or rolled, having a typical width of 3-12mm. The Ligule is Membranous, being 1-5mm in length; Auricle?: No. Growth type is Rhizomatous.
Crested Dog's-Tail
A common Perennial grass, with the scientific name of Cynosurus cristatus. The leaf is Flat or rolled, having a typical width of 1-4mm. The Ligule is Membranous, being 0.5-1.5mm in length; Auricle?: No. Growth type is Tufted. It is a flat bladed grass that was often used in some seed mixtures in the 1960s and 1970s, especially to complement perennial ryegrass. However, it does not integrate well with other species and perennial ryegrass is also a far superior species so there is currently little requirement for the use of Crested dog's-tail within seed mixtures.
Crested Hair-Grass
A common Perennial grass, with the scientific name of Koeleria macrantha. The leaf is Bristle, having a typical width of 1-2.5mm. The Ligule is Membranous, being 1mm in length; Auricle?: No. Growth type is Rhizomatous.
Crown
The base of the grass plant, which is located at the junction of the roots and shoot, near the soil surface and which is protected by being enclosed by leaf sheaths. This base of the grass plant has a high concentration of nodes, each with a bud from which roots, rhizomes and stolons originate, as well as tillers. This is also referred to as the Grass Crown.
Culm