| Name | Calycogonium rhomboideum Urban & Ekman |
| Authorship | Urban & Ekman |
| Rank | Species |
| NomenclaturalStatus | NomLeg |
| Placed in | Calycogonium |
| Citation | 1927 Ark. Bot. 21A(5): 42 |
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Calycogonium rhomboideum Urban & Ekman |
| Identification made in | [no date] (1) |