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Mark Hyde, Bart Wursten and Petra Ballings   cc-by-nc

Ceratophyllum (Hornwort) is a genus of herb in the family Ceratophyllaceae. They are associated with freshwater habitat. They are native to Canada, Puerto Rico, The Contiguous United States, U.S. Virgin Islands, North America, and Alaska.

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EOL has data for 12 attributes, including:

Known occurrences, collected specimens and observations of hornwort from the Global Biodiversity Information Facility   GBIF provides free and open access to biodiversity data. View this species on GBIF