couch grass

n.
A Eurasian grass (Agropyron repens) that has whitish-yellow root stocks and has become a troublesome weed in the New World. Also called quack grass, witch grass.

[Alteration of QUITCH GRASS.]

For more information on quack grass, visit Britannica.com.

cynodon dactylon.

• couch grass + Balansiaspp. — grazing fungus-infested grass causes staggers syndrome.

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The noun has one meaning:

Meaning #1: European grass spreading rapidly by creeping rhizomes; naturalized in North America as a weed
  Synonyms: dog grass, quackgrass, quack grass, quick grass, witch grass, witchgrass, Agropyron repens

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