Sonchus asper

Basic information
Scientific name	Sonchus asper	Click to magnify
Common names	Spiny sowthistle, Laiteron rude, Rough sowthistle, Prickly Sowthistle
Higher taxon	Asteraceae, Asterales, Magnoliopsida, Magnoliophyta
Natural range	Europe.
Habitat	Farm area, fruit garden, pasture field, lawn field, roadside, vacancy, etc.

Invasion information
Range in Japan	Almost entire Japan
Origin	Unknown.
Date	The first record in Japan was in 1892, at Tokyo.
Route	Accidental: Details unknown.
Impact	Competition with native species. Parasite (insects, fungi, viruses) Native organism(s) affected: Native grasses.
Regulation in Japan	No action for prevention, mitigation, control, or eradication.
Introduced range in other countries	Worldwide. North and South America, Africa, Asia, Oceania.

Reference

Notes

Jpn Assoc Advanc Phyto-Regul & Inst Contr Agrochem, Minist Agr, China (2000) Chinese Colored Weed Illustrated Book. Zenkoku-Noson-Kyoiku-Kyokai, Tokyo
Osada (1976) Colored Illustrations of Naturalized Plants of Japan. Hoikusha, Osaka (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.