Thinopyrum acutum

{{Short description|Species of plant}}

{{Speciesbox

| image =

| genus = Thinopyrum

| species = acutum

| authority = (DC.) Banfi

| synonyms = *Agropyron acutum (DC.) Roem. & Schult.

• Agropyron junceum subsp. acutum (DC.) Malag.
• Agropyron pungens var. acutum (DC.) Dumort.
• Braconotia acuta (DC.) Godr.
• Elymus acutus (DC.) M.-A.Thiébaud
• Elytrigia acuta (DC.) Tzvelev
• Triticum acutum DC.

}}

Thinopyrum acutum, the sea couch, is a species of perennial grass in the family Poaceae (true grasses). They have a self-supporting growth form and simple, broad leaves. Individuals can grow to 65 cm tall.{{Cite web |title=Elymus athericus (Link) Kerguélen - Encyclopedia of Life |url=https://eol.org/pages/3121617 |access-date=2022-02-04 |website=eol.org}}{{Cite web |last=Mifsud |first=Stephen |date=2002-08-23 |title=Elytrigia atherica (Sea Couch Grass) : MaltaWildPlants.com - the online Flora of the Maltese Islands. |url=https://www.maltawildplants.com/POAC/Elytrigia_atherica.php |url-status=dead |archive-url=https://web.archive.org/web/20211227174740/https://www.maltawildplants.com/POAC/Elytrigia_atherica.php |archive-date=2021-12-27 |access-date=2022-02-16 |website=www.maltawildplants.com |language=en-us}} The species is invasive to the Mont-Saint-Michel Bay and has altered the area's ecology.{{Cite journal |last=Pétillon |first=Julien |last2=Ysnel |first2=Frédéric |last3=Canard |first3=Alain |last4=Lefeuvre |first4=Jean-Claude |year=2005 |title=Impact of an invasive plant (Elymus athericus) on the conservation value of tidal salt marshes in western France and implications for management: Responses of spider populations |journal=Biological Conservation |publisher=Elsevier BV |volume=126 |issue=1 |pages=103–117 |bibcode=2005BCons.126..103P |doi=10.1016/j.biocon.2005.05.003 |issn=0006-3207}}