| Invasion information | ||
| Range in Japan | Southern Tohoku and Kanto District to western Japan |
|
| Origin | Unknown. | |
| Date | Recorded since around 1957, in Fukuoka and Kanagawa Prefs. | |
| Route | Unknown. | |
| Impact | Competition with native species. Native organism(s) affected: Riverside vegetation. | |
| Regulation in Japan | No action for prevention, mitigation, control, or eradication. | |
| Introduced range in other countries | Unknown. | |
| Reference | Notes |
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