Marsh Fimbry

Panhandle

Bay, Escambia, Franklin, Gulf, Wakulla, Walton

North

Duval, Flagler, Levy, Marion, St. Johns, Taylor

Central

Brevard, Citrus, Hillsborough, Indian River, Manatee, Okeechobee, Orange, Pasco, Pinellas, Sarasota, Seminole, Volusia

South

Charlotte, Collier, Hendry, Lee, Martin, Palm Beach

Keys

Monroe

31 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.