Persicaria amphibia
Amphibious Bistort, Water Knotweed
Other regional names: Water Persicaria +2 more
- Water Persicaria
- Water Smartweed
- Willow Grass
Botanical Data
- Taxonomic Rank: Species
- Botanical Family: Polygonaceae
- WCVP Morphological Data: Recorded natively as a perennial or helophyte.
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Found natively in Africa, Temperate Asia, Tropical Asia, Europe, and North America, Persicaria amphibia (commonly known as Amphibious Bistort or Water Knotweed) is an aquatic herbaceous perennial belonging to the Polygonaceae family. Within its native range, this species is most commonly linked to temperate conditions. There are naturally occurring varieties of this species, which are linked below.
Macro Climate
Temperate
Plant Type
Herbaceous Perennial
Plant Type
Aquatic Plant
Native Range
Continents (WGSRPD)
AFRICA, ASIA-TEMPERATE, ASIA-TROPICAL, EUROPE, NORTHERN AMERICA
Regions (WGSRPD)
Arabian Peninsula, Caucasus, China, East Tropical Africa, Eastern Asia, Eastern Canada, Eastern Europe, Indian Subcontinent, Middle Asia, Middle Europe, Mongolia, North-Central U.S.A., Northeast Tropical Africa, Northeastern U.S.A., Northern Africa, Northern Europe, Northwestern U.S.A., Russian Far East, Siberia, South-Central U.S.A., Southeastern Europe, Southeastern U.S.A., Southern Africa, Southwestern Europe, Southwestern U.S.A., Subarctic America, Western Asia, Western Canada
Botanical Countries (WGSRPD L3)
Afghanistan, Alaska, Albania, Alberta, Algeria, Altay, Amur, Arizona, Austria, Baltic States, Belarus, Belgium, British Columbia, Bulgaria, Buryatiya, California, Cape Provinces, Central European Russia, China North-Central, China South-Central, China Southeast, Chita, Colorado, Connecticut, Corse, Czechoslovakia, Delaware, Denmark, District of Columbia, East European Russia, East Himalaya, Ethiopia, Finland, France, Free State, Føroyar, Germany, Great Britain, Greece, Hungary, Iceland, Idaho, Illinois, Indiana, Inner Mongolia, Iowa, Iran, Iraq, Ireland, Irkutsk, Italy, Japan, Kamchatka, Kansas, Kazakhstan, Kenya, Khabarovsk, Kirgizistan, Korea, Krasnoyarsk, Krym, Kuril Is., KwaZulu-Natal, Labrador, Lesotho, Magadan, Maine, Manchuria, Manitoba, Maryland, Massachusetts, Michigan, Minnesota, Missouri, Mongolia, Montana, Morocco, Nebraska, Nepal, Netherlands, Nevada, New Brunswick, New Hampshire, New Jersey, New Mexico, New York, Newfoundland, North Carolina, North Caucasus, North Dakota, North European Russia, Northern Provinces, Northwest European Russia, Northwest Territories, Norway, Nova Scotia, Ohio, Oklahoma, Ontario, Oregon, Pakistan, Pennsylvania, Poland, Portugal, Primorye, Prince Edward I., Qinghai, Québec, Rhode I., Romania, Sakhalin, Sardegna, Saskatchewan, Saudi Arabia, Sicilia, South Carolina, South Dakota, South European Russia, Spain, Sweden, Switzerland, Tadzhikistan, Tibet, Transcaucasus, Tunisia, Turkey, Turkey-in-Europe, Turkmenistan, Ukraine, Utah, Uzbekistan, Vermont, West Himalaya, West Siberia, West Virginia, Wisconsin, Wyoming, Xinjiang, Yakutskiya, Yemen, Yugoslavia, Yukon
Introduced Range
Plants flagged as 'Introduced' have been transported outside their native historical range by human activity. While many are common ornamentals, some may become naturalized or invasive in local environments. Local ecological guidelines require verification prior to planting.
Botanical Countries (Non-Native)
Argentina Northeast, Argentina South
Subspecies, Varieties & Forms