| Common Name | Scientific Name | Code |
| n/a | Regnellidium diphyllum (Lindman) [excluded] | REDI |
| n/a | Regnellidium Lindm. | REGNE |
| American pillwort | Pilularia americana A. Braun | PIAM |
| bigfoot waterclover | Marsilea macropoda Engelm. ex A. Braun | MAMA9 |
| Chihuahuan waterclover | Marsilea mollis B.L. Robins. & Fern. | MAMO4 |
| dwarf waterclover | Marsilea minuta L. | MAMI13 |
| European waterclover | Marsilea quadrifolia L. | MAQU |
| Guayanan waterclover | Marsilea polycarpa Hook. & Grev. | MAPO4 |
| hairy waterclover | Marsilea vestita Hook. & Grev. | MAVE2 |
| Marsilea ancylopoda | Marsilea berteroi A. Braun | MABE |
| Marsilea ancylopoda | Marsilea mexicana A. Braun | MAME3 |
| Marsilea oligospora | Marsilea vestiva Hook. & Grev. var. oligospora (Goodding) Dorn | MAVEO |
| Marsilea vestita | Marsilea fournieri C. Christens. | MAFO4 |
| Marsilea vestita | Marsilea minuta Fourn. | MAMI8 |
| Marsilea vestita | Marsilea mucronata A. Braun | MAMU5 |
| Marsilea vestita | Marsilea tenuifolia Engelm. ex A. Braun | MATE7 |
| Marsilea vestita | Marsilea uncinata A. Braun | MAUN2 |
| Marsilea vestita | Marsilea vestita Hook. & Grev. ssp. tenuifolia (Engelm. ex A. Braun) D.M. Johnson | MAVET |
| Marsilea vestita | Marsilea vestita Hook. & Grev. ssp. vestita Hook. & Grev. [superfluous autonym] | MAVEV |
| Marsilea vestita | Marsilea vestita Hook. & Grev. var. mucronata (A. Braun) Baker | MAVEM |
| nardoo | Marsilea crenata K. Presl | MACR81 |
| Pacific waterclover | Marsilea oligospora Goodding | MAOL3 |
| pillwort | Pilularia L. | PILUL |
| rough waterclover | Marsilea hirsuta R. Br. | MAHI6 |
| tropical waterclover | Marsilea ancylopoda A. Braun | MAAN14 |
| villous waterclover | Marsilea villosa Kaulfuss | MAVI4 |
| waterclover | Marsilea L. | MARSI |