Isoetes L.

Doubtfully present in:

Sulawesi

Native to:

Alabama, Alaska, Alberta, Aleutian Is., Algeria, Altay, Angola, Argentina Northeast, Argentina Northwest, Argentina South, Arizona, Arkansas, Austria, Azores, Baleares, Baltic States, Belgium, Belize, Benin, Bolivia, Botswana, Brazil North, Brazil Northeast, Brazil South, Brazil Southeast, Brazil West-Central, British Columbia, Bulgaria, Burkina, Burundi, Buryatiya, California, Cameroon, Cape Provinces, Central African Republic, Central European Russia, Chad, Chile Central, Chile South, China South-Central, China Southeast, Chita, Colombia, Colorado, Connecticut, Corse, Costa Rica, Cuba, Czechia-Slovakia, Delaware, Denmark, District of Columbia, Dominican Republic, DR Congo, East Aegean Is., East European Russia, Ecuador, Eritrea, Eswatini, Ethiopia, Finland, Florida, France, Free State, French Guiana, Føroyar, Georgia, Germany, Ghana, Great Britain, Greece, Greenland, Guatemala, Guinea, Gulf of Guinea Is., Guyana, Haiti, Hawaii, Iceland, Idaho, Illinois, India, Indiana, Iowa, Ireland, Irkutsk, Italy, Ivory Coast, Jamaica, Japan, Kamchatka, Kansas, Kentucky, Kenya, Korea, Krasnoyarsk, Kriti, Kuril Is., KwaZulu-Natal, Labrador, Laos, Lebanon-Syria, Lesotho, Libya, Louisiana, Madagascar, Maine, Malawi, Mali, Manitoba, Maryland, Massachusetts, Mexico Central, Mexico Northeast, Mexico Northwest, Mexico Southeast, Mexico Southwest, Michigan, Minnesota, Mississippi, Missouri, Montana, Morocco, Mozambique, Myanmar, Namibia, Nebraska, Nepal, Netherlands, Nevada, New Brunswick, New Guinea, New Hampshire, New Jersey, New Mexico, New South Wales, New York, New Zealand North, New Zealand South, Newfoundland, Nicaragua, Niger, Nigeria, North Carolina, North European Russia, Northern Provinces, Northern Territory, Northwest Territories, Norway, Nova Scotia, Nunavut, NW. Balkan Pen., Ohio, Oklahoma, Ontario, Oregon, Palestine, Panamá, Paraguay, Pennsylvania, Peru, Poland, Portugal, Primorye, Prince Edward I., Queensland, Québec, Rhode I., Rwanda, Sakhalin, Sardegna, Saskatchewan, Senegal, Sicilia, South Australia, South Carolina, South Dakota, Spain, Sri Lanka, Sudan-South Sudan, Sweden, Switzerland, Taiwan, Tanzania, Tasmania, Tennessee, Texas, Thailand, Tunisia, Türkiye, Türkiye-in-Europe, Uruguay, Utah, Venezuela, Vermont, Victoria, Vietnam, Virginia, Washington, West Himalaya, West Siberia, West Virginia, Western Australia, Wisconsin, Wyoming, Yakutiya, Yukon, Zambia, Zimbabwe

Extinct in:

Philippines, Romania

POWO follows these authorities in accepting this name:

• Balkrishna, A., Joshi, B., Sribastava, A., Shankar, R. & Shukla, B.K. (2019). Classification of extant Pteridophytes: a new approach. Indian Fern Journal 36: 311-341.
• Brunton, D.F., Kartesz, J.T., Nishino, M. & Sokoloff, P.C. (2025). A conspectus of the North American Isoetaceae: 1-112. BRIT PRESS.
• Roskov Y. & al. (eds.) (2018). World Ferns: Checklist of Ferns and Lycophytes of the World. Species 2000 & ITIS Catalogue of Life Naturalis, Leiden, the Netherlands.