Ceratophyllaceae

Classification System: APG IV

Superregnum: Eukaryota
Regnum: Plantae
Cladus: Angiosperms
Ordo: Ceratophyllales

Familia: Ceratophyllaceae
Genus: Ceratophyllum
Name

Ceratophyllaceae Gray, 1822, nom. cons.
References

Lohmüller, F.A. (2009) The Botanical System of the Plants Online
Angiosperm Phylogeny Group. 2003. An update of the Angiosperm Phylogeny Group classification for the orders and families of flowering plants: APG II. Botanical Journal of the Linnean Society 141(4): 399–436. DOI: 10.1046/j.1095-8339.2003.t01-1-00158.x Open access Reference page.
Stevens, P.F. (2001 onwards). Angiosperm Phylogeny Website. Version 7, May 2006.[1]

Vernacular names
asturianu: ceratofilacees
čeština: Růžkatcovité
dansk: Hornblad-familien
Deutsch: Hornblattgewächse
English: Hornwort family
español: Ceratofiláceas
eesti: Kardheinalised
suomi: Karvalehtikasvit
français: Cératophyllacées
日本語: マツモ科
ქართული: რქაფოთოლასებრნი
한국어: 붕어마름과
latviešu: Raglapju dzimta
norsk: Hornbladfamilien
polski: Rogatkowate
slovenčina: rožkatcovité
svenska: Särvväxter
Tiếng Việt: Chi Rong đuôi chó
中文（简体）: 金鱼藻科
中文（繁體）: 金魚藻科

Ceratophyllaceae is a cosmopolitan family of flowering plants including one living genus[3] commonly found in ponds, marshes, and quiet streams in tropical and in temperate regions. It is the only extant family in the order Ceratophyllales.[4] Species are commonly called coontails or hornworts, although hornwort is also used for unrelated plants of the division Anthocerotophyta.

Living Ceratophyllum grows completely submerged, usually, though not always, floating on the surface, and does not tolerate drought.
Taxonomy

Ceratophyllaceae was considered a relative of Nymphaeaceae and included in Nymphaeales in the Cronquist system, but research has shown that it is not closely related to Nymphaeaceae or any other extant plant family. Some early molecular phylogenies suggested it was the sister group to all other angiosperms, but more recent research suggests that it is the sister group to the eudicots. The APG III system placed the family in its own order, the Ceratophyllales.[1][2][5] The APG IV system accepts the phylogeny shown below:[4]

angiosperms	Amborellales       Nymphaeales       Austrobaileyales       magnoliids     Chloranthales       monocots       Ceratophyllales     eudicots

 
 
Genera

The family contains one living genus, and several extinct genera described from the fossil record.

Ceratophyllum
†Ceratostratiotes
†Donlesia
?†Montsechia

References

Angiosperm Phylogeny Group (2009). "An update of the Angiosperm Phylogeny Group classification for the orders and families of flowering plants: APG III". Botanical Journal of the Linnean Society. 161 (2): 105–121. doi:10.1111/j.1095-8339.2009.00996.x.
Kew World Checklist of Selected Plant Families
Christenhusz, M. J. M.; Byng, J. W. (2016). "The number of known plants species in the world and its annual increase". Phytotaxa. 261 (3): 201–217. doi:10.11646/phytotaxa.261.3.1.
Angiosperm Phylogeny Group (2016). "An update of the Angiosperm Phylogeny Group classification for the orders and families of flowering plants: APG IV". Botanical Journal of the Linnean Society. 181 (1): 1–20. doi:10.1111/boj.12385.
Angiosperm Phylogeny Web: Ceratophyllales