Quackgrass (Elymus repens)

Patch of quackgrass

Patch of quackgrass

Quackgrass seedhead

Quackgrass seedhead

Quackgrass ligule

Quackgrass ligule

Quackgrass rhizome

Quackgrass rhizome

Quackgrass

Elymus repens (L.) Gould
Poaceae (Grass family)

Life cycle
Erect, rhizomatous perennial.

Leaves
Leaves are rolled in the bud, hairless to sparsely hairy above and up to 8 inches long. Leaf sheaths are hairless except those near the base, which may be sparsely hairy. Clasping, clawlike auricles are present at the collar region.
Ligule
Very short, membranous ligule.

Stems

Erect and clump-forming, up to 4 feet tall. Plants spread by thin, yellowish to white, sharp-tipped rhizomes.

Flowers and fruit

The seedhead is a two- to 10-inch-long, slender, unbranched spike made up of several alternating spikelets arranged edgewise on the stem. Each spikelet contains up to eight straw-colored, lance-shaped seeds. Each seed has a short to prominent awn.

Reproduction
Seeds and rhizomes.