| Name | Galium trifidum subsp. halophilum (Fernald & Wiegand) Puff |
| Authorship | (Fernald & Wiegand) Puff |
| Rank | Subspecies |
| Placed in | Galium trifidum Linnaeus |
| Citation | 1976 Canad. J. Bot. 54(16): 122 |
| Holdings | 58 Specimens held in the Harvard University Herbaria identified as Galium trifidum subsp. halophilum (Fernald & Wiegand) Puff |
| Identification made in | [no date] (58) |