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Conyza canadensis

Basic information
Scientific name Conyza canadensis

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ヒメムカシヨモギ
Common names Canadian fleabane, Horseweed
Higher taxon Asteraceae, Asterales, Magnoliopsida, Magnoliophyta
Natural range North America.
Habitat Farm area, fruit garden, pasture field, roadside, vacancy, riverside, etc.
Invasion information
Range in Japan Almost entire Japan Range in Japan
Origin Unknown.
Date ca. 1867
Route Accidental: Details unknown.
Impact Competition with native species, crops, pasture, etc. Parasite (insects, fungi).
Affected organism: Native grasses, crops, pasture, etc.
Regulation in Japan No action for prevention, mitigation, control, or eradication.
Introduced range in other countries Europe, Africa, Oceania, South America.
Reference Notes
  • DECO (ed) (2006) Dictionary of Alien Species. Tokyo-Shoseki, Tokyo (in Jpn)
  • Ecol Soc Jpn (ed) (2002) Handbook of Alien Species in Japan. Chijinshokan, Tokyo (in Jpn)
  • Hotta et al. (1989) Useful Plants of the World. Heibonsha, Tokyo (in Jpn)
  • JWRC (ed) (2008) A Photographic Guide to the Invasive Alien Species in Japan. Heibonsha, Tokyo (in Jpn)
  • Ministry of the Environment, Japan. The Invasive Alien Species Act (Accessed on 2011-02-03) http://www.env.go.jp/en/nature/as.html (in Jpn)
  • Satake et al. (1981) Wild Flowers of Japan, Herbaceous Plants [III]. Heibonsha, Tokyo (in Jpn)
  • Shimizu (ed) (2003) Naturalized Plants of Japan. Heibonsha, Tokyo (in Jpn)
  • etc.