| Name | Plantago elongata subsp. pentasperma Bassett |
| Authorship | Bassett |
| Rank | Subspecies |
| Placed in | Plantago elongata Pursh |
| Citation | 1966 Canad. J. Bot. 44: 470 |
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Plantago elongata subsp. pentasperma Bassett |
| Identification made in | [no date] (1) |
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