| Name | Canthium glaucum subsp. frangula (S. Moore) Bridson | 
| Authorship | (S. Moore) Bridson | 
| Rank | Subspecies | 
| Placed in | Canthium glaucum Hiern | 
| Citation | 1992 Kew Bull. 47: 366 | 
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Canthium glaucum subsp. frangula (S. Moore) Bridson | 
| Identification made in | [no date] (1) |