| Name | Juncus balticus subsp. ater (Rydberg) Snogerup |
| Authorship | (Rydberg) Snogerup |
| Rank | Subspecies |
| Placed in | Juncus balticus Willdenow |
| Citation | 2002 Preslia 74(3): 258 |
| Holdings | 73 Specimens held in the Harvard University Herbaria identified as Juncus balticus subsp. ater (Rydberg) Snogerup |
| Identification made in | [no date] (73) |