| Special Geographical Unit: | Marianna Caverns State Park |
| Verbatim Directions to Locality: | Marianna Caverns State Park |
| Habitat: | About three feet to the left of a Cotton-mouth at the edge of a wet depression: Chipola River flood plain |
| Notes: | Charles B. McDonald - This specimen bets fits P. setaceum Bald. ex Ell. Lvs are too broad to be anything in P. hydropiperoides or P. hydropiperoides var opelousanum. Pedicels are also too long-- some being as much as 5 mm. This specimen is not as strigose as typical P. setaceum but this lack of strigosity is a character often seen in plants growing in very wet conditions.
Charles McDonald 13 September 1976
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