Place
- High Island4
- Queen Anne's4
- Cabin John3
- Cecil3
- Cove Point Marsh, Cove Point, along the Chesapeake Bay.3
- Kent3
- Salisbury.3
- St. Mary's3
- Annapolis.2
- Found at Cove Point Marsh, along the Chesapeake Bay.2
- Frederick2
- Glen Echo2
- Harford2
- High Island.2
- Region between Leornardtown & Millstone.2
- Talbot2
- no data2
- Accokeek, Piscataway Park easement, off the west side of West Auburn Road .8 km from Bryan Point Road.1
- Across Rt 5 and south of Buzzy Country Store near Scotland.1
- Allegheny Plateau, wetlands parallel to the Youghigheny River, north of Gap Falls.1