| Name | Hedeoma diffusum Greene |
| Authorship | Greene |
| Rank | Species |
| NomenclaturalStatus | NomLeg |
| Placed in | Hedeoma |
| Citation | 1898 Pittonia 3: 338 |
| Holdings | 7 Specimens held in the Harvard University Herbaria identified as Hedeoma diffusum Greene |
| Identification made in | [no date] (3), 1937 (1), 1968 (2), 1981 (1) |