Swamp Dock

Panhandle

Bay, Escambia, Franklin, Gadsden, Leon, Liberty, Okaloosa, Santa Rosa, Wakulla

North

Alachua, Clay, Duval, Flagler, Madison, Marion, Nassau, Putnam, St. Johns

Central

Brevard, Citrus, DeSoto, Hernando, Hillsborough, Indian River, Lake, Manatee, Okeechobee, Orange, Osceola, Pasco, Pinellas, Polk, St. Lucie, Sarasota, Seminole, Sumter, Volusia

South

Charlotte, Collier, Glades, Lee, Martin, Palm Beach

43 of 67 counties, from research-grade iNaturalist observations. They show where people have photographed it, not every place it grows — absence here isn't proof it's absent.