National Institute for Environmental Studies Invasive Species of Japan Japanese | English
  1. Invasive Species of Japan >
  2. Vascular plants >
  3. Xanthium occidentale

Xanthium occidentale

Basic information
Scientific name Xanthium occidentale

Click to magnify

オオオナモミ
Common names Oriental cocklebur
Higher taxon Asteraceae, Asterales, Magnoliopsida, Magnoliophyta
Natural range North America.
Habitat Farm area, fruit garden, pasture field, vacancy, riverside, roadside, etc.
Invasion information
Range in Japan Almost entire Japan Range in Japan
Origin Unknown.
Date The first record in Japan was in 1929, at Okayama Pref.
Route Accidental: Details unknown.
Impact Actually: Competition with native species, crops, pastures, etc. Allelopathy.
Affected organism: Native grasses including native congeners, crops, pastures, etc.
Regulation in Japan No action for prevention, mitigation, control, or eradication.
Introduced range in other countries South America, Europe, Asia, Oceania
Reference Notes
  • 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 2011-2-25) http://www.env.go.jp/en/nature/as.html (in Jpn)
  • 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.
100 of the Japan’s Worst Invasive Alien Species