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Elytrigia repens
Scientific classification
Kingdom:	Plantae
(unranked):	Angiosperms
(unranked):	Monocots
(unranked):	Commelinids
Order:	Poales
Family:	Poaceae
Genus:	Elytrigia
Species:	E. repens
Binomial name
Elytrigia repens (L.) Desv. ex Nevski

Elytrigia repens (Couch Grass; syn. Triticum repens L., Agropyron repens (L.) P. Beauv., Elymus repens (L.) Gould) is a very common species of grass native to most of Europe, Asia, and northwest Africa. Other names include twitch, quick grass, quitch grass, dog grass, and quackgrass.^[1][2][3]

Flower spike

It has creeping rhizomes which enable it to grow rapidly across grassland. The stems ('culms') grow to 40–150 cm tall; the leaves are linear, 15–40 cm long and 3–10 mm broad at the base of the plant, with leaves higher on the stems 2–8.5 mm broad. The flower spike is 10–30 cm long, with spikelets 1–2 cm long, 5–7 mm broad and 3 mm thick with three to eight florets. The glumes are 7–12 mm long, usually without an awn or with only a short one.^[2][3][4]

There are three subspecies, one of these with an additional variety:^[1][2][3]

• Elytrigia repens subsp. repens. Throughout most of the range of the species.
  • Elytrigia repens subsp. repens var. repens. Awns usually absent or if present, very short.
  • Elytrigia repens subsp. repens var. aristata (Döll) P.D.Sell. Awns present, up to 15 mm long.
• Elytrigia repens subsp. elongatiformis (Drobow) Tzvelev (syn. Elytrigia elongatiformis (Drobow) Nevski). Central and southwestern Asia, far southeastern Europe (Ukraine).
• Elytrigia repens subsp. longearistata N. R. Cui. Western China (Xinjiang).

Hybrids are recorded with several related grasses, including Elytrigia juncea (Elytrigia × laxa (Fr.) Kerguélen), Elytrigia atherica (Elytrigia × drucei Stace), and with the barley species Hordeum secalinum (× Elytrordeum langei (K. Richt.) Hyl.).^[2]

Ecology

The foliage is an important forage grass for many grazing mammals.^[3] The seeds are eaten by several species of grassland birds, particularly buntings and finches.^[5] The caterpillars of some Lepidoptera use it as a foodplant, e.g. the Essex Skipper (Thymelicus lineola).

Cultivation and uses

Couch Grass has become naturalised throughout much of the world, and often listed as an invasive weed.^[1] It is very difficult to remove from garden environments. One method is to dig deep into the ground in order to remove as much of the grass as possible. The area should then be covered with a thick layer of woodchips. To further prevent re-growth cardboard can be placed underneath the woodchips. The long, white rhizomes will, however, dry out and die if left on the surface. Many herbicides will also control it.

Medical use

Couch Grass has been used in herbal medicine since the Classical Greek period. Sick dogs are known to dig up and eat the root, and mediaeval herbalists used it to treat inflamed bladders, painful urination and water retention. It also has antiseptic properties.^[6][7]

Other uses

The dried rhizomes of couch grass were broken up and used as incense in mediaeval Northern Europe where other resin-based types of incense were unavailable.

Notes and references

From Wikispecies

Taxonavigation

Classification System: APG II (down to family level)

Main Page
Cladus: Eukaryota
Regnum: Plantae
Cladus: Angiospermae
Cladus: Monocots
Cladus: Commelinids
Ordo: Poales
Familia: Poaceae
Subfamilia: Pooideae
Tribus: Triticeae
Genus: Elytrigia

Species: Elytrigia repens

Name

Elytrigia repens (L.) Desv. ex Nevski

Synonim

• Triticum repens L.,
• Agropyron repens (L.) P. Beauv.,
• Elymus repens (L.) Gould)

Vernacular name