Elymus repens (Couch grass)

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Elymus repens (L.) Gould

Couch grass, quackgrass

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Agropyron repens (L.) P. Beauv.
Agropyron repens (L.) P. Beauv. var. subulatum (Schreb.) Roem. & Schult.
Elytrigia repens (L.) Desv. ex Nevski
Elytrigia repens (L.) Desv. ex Nevski var. vaillantiana (Wulfen & Schreb.) Prokudin
Elytrigia vaillantiana (Wulfen & Schreb.) Beetle
Triticum repens L.
Triticum vaillantianum Wulfen & Schreb.

7/20/2023 · Curtis Farm Preserve, Harpswell, Maine

7/12/2015 · Bingham Falls, Smuggler’s Notch State Park, Cambridge, Vermont · ≈ 5 × 7″ (12 × 18 cm)

7/20/2023 · Curtis Farm Preserve, Harpswell, Maine

7/2/2014 · Conservation Area, Shirley St., Groton, Massachusetts · ≈ 6 × 7″ (16 × 18 cm)

Kingdom	Plantae	Plants, but not fungi, lichens, or algae (from Stearn's Botanical Latin)
Subkingdom	Tracheobionta	Vascular plants—plants with a “circulatory system” for delivering water and nutrients
Division	Magnoliophyta	Flowering plants, also known as angiosperms
Class	Liliopsida	Monocots (plants with a single seed leaf); includes the lily family
Subclass	Commelinidae	Dayflowers and spiderworts, and several others
Order	Cyperales	Flowering plants including grasses
Family	Poaceae	Grasses (but not sedges or rushes)
Genus	Elymus	From the Greek name elymos for “millet,” in turn from elyo, “to cover”
Species	repens	Having creeping and rooting stems

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Elymus repens description by Thomas H. Kent, not updated.