National Institute for Environmental Studies Invasive Species of Japan Japanese | English
  1. Invasive Species of Japan >
  2. Vascular plants >
  3. Bidens pilosa var. radiata

Bidens pilosa var. radiata

Basic information
Scientific name Bidens pilosa var. radiata (No picture)
Common names Romerillo
Higher taxon Asteraceae, Asterales, Magnoliopsida, Magnoliophyta
Natural range Tropical America
Habitat Roadside, farm area, etc.
Invasion information
Range in Japan Southern Kyushu Is., Okinawa, Sakishima, and Ogasawara (Bonin) Islands. Range in Japan
Origin Unknown.
Date Introduced in 1844-1848. The first record in the field was in 1963 at Kochi Pref.
Route Deliberate: As ornamental plant.
Impact Actually: Competition with native species. Noxious weed in cane land.
Native organism(s) affected: Native grasses, cane, etc.
Regulation in Japan No action for prevention, mitigation, control, or eradication.
Introduced range in other countries Worldwide
Reference Notes
  • DECO (ed) (2006) Dictionary of Alien Species. Tokyo-Shoseki, 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 2011-2-15) http://www.env.go.jp/en/nature/as.html (in Jpn)
  • Osada (1976) Colored Illustrations of Naturalized Plants of Japan. Hoikusha, Osaka (in Jpn)
 100 of the Japan’s Worst Invasive Alien Species.