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.
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. Affected organism: Native grasses, cane, etc.
Regulation in Japan	No regulation in Japan
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.