| Name | Potamogeton heterophyllus f. maximus Morong |
| Authorship | Morong |
| Rank | Forma |
| Placed in | Potamogeton heterophyllus Schreber |
| Citation | 1893 Mem. Torrey Bot. Club 3(2):25 |
| Holdings | 3 Specimens held in the Harvard University Herbaria identified as Potamogeton heterophyllus f. maximus Morong |
| Identification made in | 1908 (1), 2012 (2) |
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