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  3. Alternanthera philoxeroides

Alternanthera philoxeroides

Basic information
Scientific name Alternanthera philoxeroides

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Common names Alligatorweed
Higher taxon Amaranthaceae, Caryophyllales, Magnoliopsida, Magnoliophyta
Natural range South America.
Habitat Channel, stream, swamp, etc.
Invasion information
Range in Japan Chiba, Kanagawa, Shizuoka, Shiga, Kyoto, Osaka, Hyogo, Fukuoka, Saga, Kumamoto, Kagoshima, and Okinawa Prefs. Range in Japan
Origin Unknown.
Date The first record in Japan was in 1989 at Amagasaki, Hyogo Pref.
Route Deliberate: Escape of aquarium ornament.
Impact Competition with native species. Disturbance of boat operation.
Native organism(s) affected: Native aquatic plants
Regulation in Japan Import, transport and keeping are legally restricted in Japan.
Introduced range in other countries Taiwan, Australia, Libya, USA, etc.
Reference Notes
  • Tanaka (1992) Alternanthera philoxeroides (Mart.) Griseb., a new naturalized plant from Amagasaki City. Hyoko Biology. 10, 107-108 (in Jpn)
  • DECO (ed) (2006) Dictionary of Alien Species. Tokyo-Shoseki. (in Jpn)
  • GBIF Portal
  • JWRC (ed) (2008) A Photographic Guide to the Invasive Alien Species in Japan. Heibonsha. (in Jpn)
  • etc.