It most closely resembles C. echinatum (Spiny Coontail), which is much less common, has 5 or more leaves in a whorl, most leaves are forked 3 or 4 times and have few if any teeth, the leaf segments are more thread-like and limp, and fruit has spines along the edges as well as the tip and base. Ceratophyllum echinatum smooth hornwort Ceratophyllaceae R1. Spiny hornwort can be found in ponds and lakes, principally in eastern North America.It is the only species of its genus endemic to North America. echinatum (A.Gray) Wilmot-Dear Homonyms Ceratophyllum echinatum A.Gray Common names Spineless hornwort in language. Genus Synonyms. Synonym Full Citation Basionym Type; Dichotophyllum Dichotophyllum Moench, Methodus 345. State Status Federal Status Scientific Name Common Name Habitat Family Name. elata. Ceratophyllum echinatum, known as prickly hornwort, spiny hornwort, or spiny coontail, is an aquatic, perennial plant found in North America. *The database used to provide updates to the Online Inventory is under construction. Its name comes from fruits, which have a warty surface and long spines. Ceratophyllum demersum coontail, horwort Ceratophyllum echinatum spineless hornwort Macroalgae from the family Characeae (Nitella, Chara) charaphyte(s) Sedges from the family Cyperaceae (Cyperus, Carex) sedge(s) Decodon verticillatus swamp loosestrife Egeria densa Brazilian elodea, Brazilian waterweed, common waterweed, South American waterweed Native Introduced Native and Introduced. Ceratophyllum demersum: leaves mostly 1-time or 2-times forked and achenes with only 2 basal spines (vs. C. echinatum, with leaves mostly 3-times or 4-times … Habitat:Maine is home to two hornwort species: coontail (Ceratophyllum demersum) and prickly hornwort (Ceratophyllum echinatum), coontail being the more common of the two.Hornworts are found in the submersed plant community from shore to depths of several meters. Scientific Name Common Name Herbarium Specimens Photos; Ceratophyllum australe: PRICKLY HORNWORT: Ceratophyllum demersum: COONTAIL: Ceratophyllum echinatum: SPINY HORNWORT: Identification Key. echinatum (A.Gray) A.Gray Ceratophyllum submersum var. Dryas drummondii var. Preferred name: Ceratophyllum echinatum ; Authority: Gray ; Notes. Cimicifuga elata var. Name Synonyms Ceratophyllum demersum var. The website also provides access to a database and images of herbarium specimens found at the University of South Florida and other herbaria. Hornwort specimen. ... Scientific Name Common Name Habitat Family Name. Educational Projects & Seminars Materials, Proposals, Business Plan, Feasibility Studies, Career Jobs, Finance, Technology & School Admission echinatum (Gray) Wilmot-Dear: Common names. Ceratophyllum is a cosmopolitan genus of flowering plants including four accepted living species in 2016, commonly found in ponds, marshes, and quiet streams in tropical and in temperate regions. spineless hornwort in English cornifle échinée in French HORNWORTS Ceratophyllum demersum and Ceratophyllum echinatum NATIVE TO MAINE. The Plants Database includes the following 4 species of Ceratophyllum . The Atlas of Florida Plants provides a source of information for the distribution of plants within the state and taxonomic information. North America (eastern, western coast) ... Name Authority; Ceratophyllum demersum var. Click below on a thumbnail map or name for species profiles. View updates and changes made since May 2019 here. 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