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.