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  3. Eichhornia crassipes

Eichhornia crassipes

Basic information
Scientific name Eichhornia crassipes

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ホテイアオイ
Common names Water hyacinth
Higher taxon Pontederiaceae, Commelinales, Liliopsida, Magnoliophyta
Natural range South America
Habitat Various freshwater environment, such as lake, pond, rice field, swamp, river, etc.
Invasion information
Range in Japan Central to Southern Japan. Hachijojima Is. (Izu Islands). Especially abundant in Kyushu and Shikoku Islands. Range in Japan
Origin USA
Date Imported to Japan around 1880-1900. Established by 1972.
Route Deliberate: as ornamental plant and cattle feed. Now distributed for ornamental, cleaning up water, plant food, etc.
Impact Competition against native species and crop (rice). Disturbance of river transport. Carrying plant pests (pest insects, mites, virus, etc.)
Affected organism: Aquatic plants, rice, etc.
Regulation in Japan Keeping of this species in Saga Pref. are controled by a prefectural ordinance. Import to Australia is prohibited.
Introduced range in other countries South Korea, Taiwan, N America, W Europe, Africa, Oceania, Hawaii
Reference Notes
  • DECO (ed) (2006) Dictionary of Alien Species. Tokyo-Shoseki, Tokyo. (in Jpn)
  • Hotta et al. (1989) Useful Plants of the World. Heibonsha, Tokyo. (in Jpn)
  • GBIF Portal http://data.gbif.org/welcome.htm
  • Jpn. Assoc. Advance. Phyto-Regul. & Inst. Contr. Agrochem., Minist. Agr., China (2000) Chinese Colored Weed Illustrated Book. Zenkoku-Noson-Kyoiku-Kyokai, Tokyo. (in Jpn)
  • Osada (1976) Colored Illustrations of Naturalized Plants of Japan. Hoikusha, Tokyo (in Jpn)
  • Satake et al. (1982) Wild Flowers of Japan, Herbaceous Plants [I]. Heibonsha, Tokyo. (in Jpn)
  • Shimizu (2003) Naturalized Plants of Japan. Heibonsha, Tokyo. (in Jpn)
  • JWRC (ed) (2008) A Photographic Guide to the Invasive Alien Species in Japan. Heibonsha. (in Jpn)
  • etc.
Assigned as 100 of the World’s Worst Invasive Alien Species and 100 of the Japanese Worst Invasive Alien Species.