| Name | Cassiope mertensiana subsp. gracilis Piper |
| Authorship | Piper |
| Rank | Subspecies |
| Placed in | Cassiope mertensiana (Bongard) D. Don |
| Holdings | 17 Specimens held in the Harvard University Herbaria identified as Cassiope mertensiana subsp. gracilis Piper |
| Identification made in | [no date] (1), 1995 (16) |