Gymnocoronis spilanthoides

Basic information
Scientific name	Gymnocoronis spilanthoides	Click to magnify
Common names	Senegal tea plant, Giant green hygro
Higher taxon	Asteraceae, Asterales, Magnoliopsida, Magnoliophyta
Natural range	C & S America
Habitat	Around channel, stream.

Invasion information
Range in Japan	Ibaraki, Tohigi, Gumma, Chiba, Saitama, Tokyo, Aichi, Shiga, Wakayama, Osaka, Hyogo, Kochi, Fukuoka, and Oita Prefs.
Origin	Unknown.
Date	The first record of establishment was in 1995 at Aichi Pref.
Route	Deliberate: escaped from ornament in aquarium.
Impact	Competition with native species. Disturbance of channel. Destruction of fish habitat. Eradication is conducted in channels of Tokyo, Osaka, and Fukuoka. Native organism(s) affected: Native aquatic plants and animals.
Regulation in Japan	Import, transport and keeping are prohibited in Japan.
Introduced range in other countries	Taiwan, Australia, New Zealand, etc.

Reference	Notes
DECO (ed) (2006) Dictionary of Alien Species. Tokyo-Shoseki. (in Jpn) GBIF Portal http://data.gbif.org/welcome.htm JWRC (ed) (2008) A Photographic Guide to the Invasive Alien Species in Japan. Heibonsha. (in Jpn) etc.