Conyza canadensis

Basic information
Scientific name	Conyza canadensis	Click to magnify
Major synonym	Erigeron canadensis
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
Origin	Unknown.
Date	ca. 1867
Route	Accidental: Details unknown.
Impact	Competition with native species, crops, pasture, etc. Parasite (insects, fungi). Native organism(s) affected: 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.