Genus Ceratophyllum, commonly known as hornwort, is a group of aquatic plants characterized by finely divided, feather-like leaves. Synonyms for Ceratophyllum include Coontail, Foxtail, and Rigid hornwort. Coontail gets its name from its resemblance to a raccoon's tail, while Foxtail is so named because of its fox-tail like appearance. Rigid hornwort, on the other hand, is a reference to the plant's tough, durable leaves. All of these synonyms refer to species belonging to the Ceratophyllum genus, which can be found in a wide range of aquatic environments, from lakes and ponds to slow-moving rivers and streams.