| Name | Pycnanthemum flexuosum (Walter) Britton, Sterns & Poggenburg |
| Authorship | (Walter) Britton, Sterns & Poggenburg |
| Rank | Species |
| Placed in | Pycnanthemum |
| Holdings | 117 Specimens held in the Harvard University Herbaria identified as Pycnanthemum flexuosum (Walter) Britton, Sterns & Poggenburg |
| Identification made in | [no date] (61), 1939 (1), 1941 (1), 2005 (54) |
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