Classification of the order Ceratophyllales

Or. Ceratophyllales Link 1829
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Fm. Ceratophyllaceae Gray 1822 [hornwort]
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G. Ceratophyllum Linnaeus 1753
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Ceratophyllum demersum Linnaeus 1753
G. †Donlesia Dilcher and Wang 2009
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Donlesia dakotensis Dilcher and Wang 2009