| Special Geographical Unit: | Tall Timbers Research Station |
| Verbatim Directions to Locality: | Gannett Pond, Tall Timbers Research Station. |
| Habitat: | Exposed peaty bottom of Gannett Pond. |
| Plant Morphology Observations: | Twice as tall as P. hydropiperoides var. hydropiperoides. |
| Local Abundance Observations: | One clump in extensive colony of P. hydropiperoides var. hydropiperoides. |