| Common Name | Scientific Name | Code |
| n/a | Ceratophyllum submersum L. [excluded] | CESU6 |
| Ceratophyllum demersum | Ceratophyllum apiculatum Cham. | CEAP |
| Ceratophyllum demersum | Ceratophyllum demersum L. var. apiculatum (Cham.) Aschers. | CEDEA |
| Ceratophyllum echinatum | Ceratophyllum demersum L. var. echinatum (Gray) Gray | CEDEE |
| Ceratophyllum echinatum | Ceratophyllum submersum L. var. echinatum (Gray) Wilmot-Dear | CESUE |
| Ceratophyllum muricatum ssp. australe | Ceratophyllum australe Griseb. | CEAU4 |
| Ceratophyllum muricatum ssp. australe | Ceratophyllum cristatum Spruce ex K. Schum. | CECR3 |
| Ceratophyllum muricatum ssp. australe | Ceratophyllum demersum L. var. cristatum K. Schum. | CEDEC |
| Ceratophyllum muricatum ssp. australe | Ceratophyllum floridanum Fassett | CEFL5 |
| Ceratophyllum muricatum ssp. australe | Ceratophyllum llerenae Fassett | CELL |
| Ceratophyllum muricatum ssp. australe | Ceratophyllum submersum L. ssp. muricatum auct. non (Cham.) Wilmot-Dear [misapplied] | CESUM |
| coon's tail | Ceratophyllum demersum L. | CEDE4 |
| hornwort | Ceratophyllum L. | CERAT |
| prickly hornwort | Ceratophyllum muricatum Cham. | CEMU3 |
| prickly hornwort | Ceratophyllum muricatum Cham. ssp. australe (Griseb.) D.H. Les | CEMUA |
| spineless hornwort | Ceratophyllum echinatum Gray | CEEC2 |