Cyperus congestus

Basic information
Scientific name	Cyperus congestus	Click to magnify
Major synonym	Mariscus congestus
Common names	Dense flat sedge
Higher taxon	Cyperaceae, Poales, Liliopsida, Magnoliophyta
Natural range	S Africa
Habitat	Beach, sandy moist place.

Invasion information
Range in Japan	Tokyo, Chiba, and Saitama Prefs.
Origin	Unknown.
Date	The first record in Japan was in 1982 at Tokyo.
Route	Accidental: Hitchhiking on some transport.
Impact	Competition with native species. Native organism(s) affected: Native grasses.
Regulation in Japan	No action for prevention, mitigation, control, or eradication.
Introduced range in other countries	Europe, Australia, etc.

Reference	Notes
Shimizu (ed) (2003) Naturalized Plants of Japan. Heibonsha, Tokyo (in Jpn) etc.