Diodia teres

Basic information
Scientific name	Diodia teres	Click to magnify
Common names	Poorjoe
Higher taxon	Rubiaceae, Rubiales, Magnoliopsida, Magnoliophyta
Natural range	North America.
Habitat	Vacancy, riverside, etc.

Invasion information
Range in Japan	Central Honshu to western Japan
Origin	Unknown.
Date	The first record of establishment in Japan was in 1920s at Tokyo.
Route	Unknown.
Impact	Competition with native species. Native organism(s) affected: Native herbs
Regulation in Japan	No action for prevention, mitigation, control, or eradication.
Introduced range in other countries	Unknown.

Reference	Notes
Muranaka & Washitani (2001) Alien plant invasions and gravelly floodplain vegetation of the Kinu River. Ecol Civil Eng. 4(2), 121-132 (in Jpn) Osada (1976) Colored Illustrations of Naturalized Plants of Japan. Hoikusha, Tokyo (in Jpn) etc.