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.

[1][2] The species is invasive to the Mont-Saint-Michel Bay and has altered the area's ecology.

[3] This article incorporates text from a free content work.