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Myriophyllum aquaticum

Basic information
Scientific name Myriophyllum aquaticum

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オオフサモ
Common names Parrot’s Feather, Water-Feather, Brazilian watermilfoil
Higher taxon Haloragaceae, Haloragales, Magnoliopsida, Magnoliophyta
Natural range Brazil
Habitat Lake, pond, river, canal, etc.
Invasion information
Range in Japan Almost entire Japan (no record in Aomori, Iwate, Akita, and Fukushima Prefs.) Range in Japan
Origin Germany
Date German people introduced in ca. 1920. The first establishment was in a pond of Suma, Hyogo Pref.
Route Deliberate: As ornamental plant.
Impact Actually: Competition with native species. Disturbance of water flow.
Native organism(s) affected: Native aquatic plants.
Regulation in Japan Import, transport and keeping are prohibited in Japan by the Invasive Alien Species Act. Import to Australia is prohibited.
Introduced range in other countries North America, S Europe, N Africa, Asia, Oceania, etc.
Reference Notes
  • Osada (1976) Colored Illustrations of Naturalized Plants of Japan. Hoikusha, Osaka (in Jpn)
  • Ministry of the Environment, Japan. The Invasive Alien Species Act (Accessed on 2011-1-20) http://www.env.go.jp/en/nature/as.html (in Jpn)
  • Pisces (1993) Picture Book of Aquarium Fish & Water-Plants. Pisces, Yokohama (in Jpn)
  • Shimizu (ed) (2003) Naturalized Plants of Japan. Heibonsha, Tokyo (in Jpn)
  • etc.
 100 of the Japan’s Worst Invasive Alien Species