| Name | Scirpus trapezoideus Koidzumi |
| Authorship | Koidzumi |
| Rank | Species |
| Placed in | Scirpus Linnaeus |
| Citation | 1925 Bot. Mag. (Tokyo) 39: 26 |
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Scirpus trapezoideus Koidzumi |
| Identification made in | [no date] (1) |