| Name | Phlox longifolia subsp. marginata Brand |
| Authorship | Brand |
| Rank | Subspecies |
| Placed in | Phlox longifolia Nuttall |
| Citation | 1907 Pflanzenr. [Engler] [Heft 27] 4, Fam. 250: 65 |
| Holdings | 3 Specimens held in the Harvard University Herbaria identified as Phlox longifolia subsp. marginata Brand |
| Identification made in | [no date] (1), 1923 (1), 2018 (1) |