| Name | Galium mexicanum subsp. asperrimum (A. Gray) Dempster |
| Authorship | (A. Gray) Dempster |
| Rank | Subspecies |
| Placed in | Galium mexicanum Kunth |
| Citation | 1976 MadroƱo 23(7): 384 |
| Holdings | 19 Specimens held in the Harvard University Herbaria identified as Galium mexicanum subsp. asperrimum (A. Gray) Dempster |
| Identification made in | [no date] (18), 1976 (1) |