couch grass

Names and Synonyms

Common Names

• couchgrass
• creeping wildrye
• quackgrass
• Common Couch
• Couch
• Couch Wheat Grass
• Dog Grass
• English Couch Grass
• Quitch
• Quitch Grass
• Twitch
• Twitch Grass
• Wheat Grass

Scientific Names

Accepted name

Synonyms

• Agropyron repens
• Frumentum repens
• Triticum repens
• Agropyron junceum var. repens
• Elytrigia repens
• Zeia repens

Regional and Traditional Names

Sources: Wikidata, Catalogue of Life

Taxonomical Classification

This plant belongs to the kingdom Plantae and the phylum Streptophyta, falling under the class Equisetopsida and subclass Magnoliidae. Within the order Poales, it is classified under the family Poaceae. Finally, it is identified by the genus Elymus.

Sources: The World Checklist of Vascular Plants (WCVP)

Distribution

This plant exhibits a distinct geographical distribution centered across the northern reaches of Europe. It can be found growing in the coastal and inland regions of Denmark. The species also populates the landscapes of Finland and the islands of Føroyar. Furthermore, its presence extends to the territories of Great Britain. Finally, the distribution concludes with its occurrence in Iceland.

Sources: The World Checklist of Vascular Plants (WCVP)

Botanical Identification

Ecology

The ecology of Elymus repens is characterized by its remarkable adaptability to diverse environments, ranging from sea level up to an elevation of 3600 m AMSL. This wide vertical distribution allows the species to thrive across a vast array of altitudinal gradients. In terms of specific landscape preferences, the plant is commonly found colonizing moist and disturbed sites, particularly within canals and meadows. These habitats provide the necessary moisture levels and soil conditions that support its vigorous growth patterns and ability to spread effectively across open terrains.

Elevational range max:

3600 m AMSL

Elevational range min:

0 m AMSL

Habitat :

canals, meadows

Life history

The life history of Elymus repens is characterized by its robust and enduring nature, functioning as a perennial species that allows it to persist across multiple growing seasons. Its survival strategy is deeply rooted in its classification as a cryptophyte, utilizing underground structures to withstand unfavorable environmental conditions. Specifically, it exhibits a hemicryptophyte life form, where its perennating buds are located at or just below the soil surface, protected by leaf litter or the earth itself. This combination of a perennial lifecycle and a hemicryptophyte growth habit enables the plant to establish extensive rhizomatous networks, ensuring long-term stability and rapid regeneration within its habitat.

Life form :

hemicryptophyte

Life form :

cryptophyte

Lifecycle :

perennial

Morphology

The morphology of Elymus repens is characterized by its growth as a graminoid herb that is strictly non-woody in structure. The plant exhibits a self-supporting growth habit and functions as an independent organism, lacking any parasitic or epiphytic tendencies, as it is a terrestrial species. Its shoot orientation is primarily prostrate, and the plant height varies significantly depending on environmental conditions, ranging from a minimum of 0.15 m to a maximum of 1.5 m, with a mean height of approximately 0.78 m.

Aquatic :

terrestrial

Climber :

self-supporting

Epiphyte :

terrestrial

Growth form :

herb

Growth form :

graminoid

Parasite :

independent

Plant height max:

1.5 m

Plant height mean:

0.78 m

Plant height min:

0.15 m

Shoot orientation :

prostrate

Woodiness :

non-woody

Physiology

The physiology of Elymus repens is characterized by a C3 photosynthetic pathway, which dictates its carbon fixation processes and metabolic efficiency. As a non-carnivorous organism, it relies entirely on autotrophic nutrition rather than capturing prey to supplement its nutrient intake. The leaf morphology plays a critical role in its resource acquisition, exhibiting a diverse range of dimensions with leaf lengths ranging from a minimum of 5 cm to a maximum of 30 cm. The width of the leaves varies from a minimum of 0.5 cm to a maximum of 1.5 cm, maintaining a mean leaf width of 0.7 cm. These morphological parameters contribute to a mean leaf size of approximately 23.61667 cm², which, when integrated with the plant's biomass, results in a mean Specific Leaf Area (SLA) of 236.19 cm²/g, reflecting its leaf thickness and light-interception strategy.

Carnivory :

non-carnivorous

Leaf length max:

30 cm

Leaf length min:

5 cm

Leaf size mean:

23.61667 cm²

Leaf width max:

1.5 cm

Leaf width mean:

0.7 cm

Leaf width min:

0.5 cm

Photosynthetic pathway :

C3

Specific Leaf Area (SLA) mean:

236.19 cm²/g

Reproduction

The reproduction of Elymus repens is characterized by a sexual process involving bisexual flowers organized in a spike-type inflorescence. The flowering period typically begins in June and extends through August, with the inflorescence length ranging from a minimum of 0.05 m to a maximum of 0.2 m. The individual flowers within the spike vary in size, with lengths measuring between 0.8 cm and 1.2 cm. Pollination is achieved through an abiotic syndrome, specifically via wind (anemophily), and self-fertilization is noted as absent. Following successful pollination, the plant produces dry fruits that contain a significant number of seeds, ranging from 101 to 1000 seeds per fruit. The resulting seeds have a mean length of 4 mm (with minimum and maximum values also at 4 mm), a mean mass of approximately 0.003138 g (ranging from 0.001614 g to 0.00427 g), and a mean volume of 2.25 mm³ (ranging from 1.9 mm³ to 2.6 mm³). Dispersal of these seeds is anemochorous, relying on the wind to distribute them. Notably, asexual reproduction is absent in this species.

Dispersal syndrome :

anemochorous

Flower length max:

1.2 cm

Flower length min:

0.8 cm

Flowering time :

Jun

Flowering time :

Aug

Fruit dryness :

dry

Inflorescence :

spike

Inflorescence length max:

0.2 m

Inflorescence length min:

0.05 m

Pollination syndrome :

wind

Pollination syndrome :

abiotic

Reproduction asexual :

absent

Reproduction sexual :

bisexual

Seed length mean:

4 mm

Seed mass max:

0.00427 g

Seed mass mean:

0.00313835714285714 g

Seed mass min:

0.001614 g

Seed volume max:

2.6 mm³

Seed volume mean:

2.25 mm³

Seed volume min:

1.9 mm³

Seeds_per_fruit :

101-1000

Self fertilization :

absent

Sources: Global Inventory of Floras and Traits (GIFT)

Plant Parts

Elymus repens has 1 reported plant parts identified across 1 scientific publications and several other databases that are studied for medicinal purposes. The most consistently reported plant part include rhizome.

Rhizome

1. Journal of ethnopharmacology

Chemicals

Elymus repens has 46 reported phytochemicals identified across 1 scientific publications and several other databases. The most consistently reported chemicals include ALUMINUM, Agropyrene, Ash, CALCIUM, CARVACROL.

ALUMINUM

1. Dr. Duke

Agropyrene

1. Dr. Duke

Ash

1. Dr. Duke

CALCIUM

1. Dr. Duke

CARVACROL

1. Dr. Duke

CARVONE

1. Dr. Duke

CHROMIUM

1. Dr. Duke

COBALT

1. Dr. Duke

EO

1. Dr. Duke

ERGOTAMINE

1. Dr. Duke

Activities

Elymus repens has 339 reported activities identified across 1 scientific publications and several other databases. The most consistently reported activities include ACE-Inhibitor, AP-1-Inhibitor, Acaricide, Allelochemic, Allelopathic.

ACE-Inhibitor

1. Dr. Duke

AP-1-Inhibitor

1. Dr. Duke

Acaricide

1. Dr. Duke

Allelochemic

1. Dr. Duke

Allelopathic

1. Dr. Duke

Allergenic

1. Dr. Duke

Amphiglycemic?

1. Dr. Duke

Analgesic

1. Dr. Duke

Ancylostomicide

1. Dr. Duke

Anesthetic

1. Dr. Duke

Preparations