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  3. Elytrigia repens

Elytrigia repens

Basic information
Scientific name Elytrigia repens

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Major synonym Agropyron repens
Common names Quackgrass, Couch grass, English twitch
Higher taxon Poaceae, Poales, Liliopsida, Magnoliophyta
Natural range Mediterranean coast.
Habitat Natural beach, crop field, some kind of farm area, grassland, stream, urban area, vacancy, waterfront.
Invasion information
Range in Japan Almost entire Japan Range in Japan
Origin Unknown.
Date Middle to late 19C
Route Deliberate: as a pasture plant.
Impact Competition with native and crop species. Allelopathy. Host for insects, fungi, and nematodes.
Native organism(s) affected: Native and crop plants.
Regulation in Japan Import of stems and leaves of Agropyron from the regions with Mayetiola destructor to Japan is prohibited by the Plant Protection Act.
Introduced range in other countries Asia, Oceania, North and Latin America.
Reference Notes
  • Shimizu (ed) (2003) Naturalized Plants of Japan. Heibonsha, Tokyo (in Jpn)
  • etc.