Synonyms recognized by ITIS (bold taxon is currently accepted):

     Ceratophyllum echinatum Gray
     Ceratophyllum demersum var. echinatum (Gray) Gray
     Ceratophyllum submersum var. echinatum (Gray) Wilmot-Dear

Common Name(s): prickly hornwort, spineless hornwort.

Taxonomic Hierarchy: (ITIS TSN=501366, click for more information and references)

        Kingdom: Plantae
            Subkingdom: Tracheobionta
                Division: Magnoliophyta
                    Class: Magnoliopsida
                        Subclass: Magnoliidae
                            Order: Nymphaeales
                                Family: Ceratophyllaceae
                                    Genus: Ceratophyllum
                                        Species: Ceratophyllum echinatum