| Name | Cladium mariscoides f. conjestum Fernald |
| Authorship | Fernald |
| Rank | Forma |
| NomenclaturalStatus | NomLeg |
| Placed in | Cladium mariscoides (Muhlenberg) Torrey |
| Citation | 1922 Rhodora 23: 234 |
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Cladium mariscoides f. conjestum Fernald |
| Identification made in | [no date] (1) |