Dig deeper at SERNEC, a consortium of southeastern herbaria.
Check out EDDMapS.org to see where this has been reported.
Spermatophytes (seed plants): Angiosperms (flowering plants): Monocots: Alismatales
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Keith Bradley kab_p_stratiotes_70942
July Collier County FL
Fakahatchee Strand Preserve State Park
A whorl of male flowers tops a short stalk with a single female at its base, per Invasive Plants, Guide to Identification, Impacts and Control.
JK Marlow jkm160914_085
SE-EPPC Aquatic Plant ID Workshop
Leaves light green, thick, softly hairy, with distinct parallel ridges, per Invasive Plants, Guide to Identification, Impacts and Control.
COMPARE aquatic plants
Graves Lovell, Alabama Dept. of Conservation & Natural Resources, Bugwood.org bug_5400750
Looks like an open head of lettuce floating on the water, per Invasive Plants, Guide to Identification, Impacts and Control.