Ceratophyllaceae of North America Update, database (version 2010)
Updated by the Flora of North America Expertise Network, in connection with an update for USDA PLANTS (2007-2010)
NODC Taxonomic Code, database (version 8.0)
The PLANTS Database, database (version 4.0.4)
National Plant Data Center, NRCS, USDA. Baton Rouge, LA 70874-4490 USA. http://plants.usda.gov
Les, Donald H. / Flora of North America Editorial Committee, eds
Ceratophyllaceae Gray: Hornwort Family
Journal/Book Name, Vol. No.:
Flora of North America North of Mexico, vol. 3: Magnoliophyta: Magnoliidae and Hamamelidae
Oxford University Press
New York, New York, USA
Available online at http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=10178
Les (1997:83) indicates that 'Specimens of Ceratophyllum demersum with short basal spines or tubercles have been misidentified as C . submersum Linnaeus, a species not known in the New World despite reports to the contrary'
ITIS taxonomy is based on the latest scientific consensus available,
and is provided as a general reference source for interested parties.
However, it is not a legal authority for statutory or regulatory purposes.
While every effort has been made to provide the most reliable and up-to-date
information available, ultimate legal requirements with respect to species
are contained in provisions of treaties to which the United States is a
party, wildlife statutes, regulations, and any applicable notices that have
been published in the Federal Register. For further information on U.S.
legal requirements with respect to protected taxa, please contact the
U.S. Fish and Wildlife Service.