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Veronica anagallis-aquatica

Basic information
Scientific name Veronica anagallis-aquatica

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オオカワヂシャ
Common names Water speedwell
Higher taxon Scrophulariaceae, Scrophulariales, Magnoliopsida, Magnoliophyta
Natural range Europe to north Asia
Habitat Around channel, stream, swamp, etc.
Invasion information
Range in Japan Almost entire Japan. All the Prefectures of Honshu Is. except Akita, Yamagata, Yamanashi, and Ishikawa, and Tokushima, Ehime, Oita, and Saga Prefs. Range in Japan
Origin
Date Unknown. The oldest record in Japan was in 1867 at Kanagawa Pref.
Route Unknown.
Impact Competition and hybridization with native species.
Affected organism: Native congener V. undulata. In W Japan, the native species have been replaced by the hybrid V. × myriantha.
Regulation in Japan Import, transport and keeping are prohibited in Japan by the Invasive Alien Species Act.
Introduced range in other countries North and South America, Africa, and Australia
Reference Notes
  • DECO (ed) (2006) Dictionary of Alien Species. Tokyo-Shoseki. (in Jpn)
  • JWRC (ed) (2008) A Photographic Guide to the Invasive Alien Species in Japan. Heibonsha. (in Jpn)
  • Ministry of the Environment, Japan. The Invasive Alien Species Act (Accessed on 2011-12-21) http://www.env.go.jp/en/nature/as.html
  • etc.