| Name | Arenaria longistyla var. eugonophylla Fernald |
| Authorship | Fernald |
| Rank | Variety |
| Placed in | Arenaria longistyla Franchet |
| Citation | 1919 Rhodora 21: 5 |
| Holdings | 4 Specimens held in the Harvard University Herbaria identified as Arenaria longistyla var. eugonophylla Fernald |
| Identification made in | [no date] (3), 2021 (1) |