| Name | Ischaemum aristatum subsp. barbatum (Retzius) Hackel |
| Authorship | (Retzius) Hackel |
| Rank | Subspecies |
| Placed in | Ischaemum aristatum Linnaeus |
| Citation | 1889 Monogr. Phan. [A.DC. & C.DC.] 6: 204 |
| Holdings | 5 Specimens held in the Harvard University Herbaria identified as Ischaemum aristatum subsp. barbatum (Retzius) Hackel |
| Identification made in | [no date] (5) |
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