- Augbirth Park2
- Balto2
- Bethesda2
- Elvaton2
- Found at Cove Point Marsh, along the Chesapeake Bay.2
- Glen Echo2
- Harford2
- High Island.2
- Negro Mt. Bog, 6 mi SW of Grantsville2
- Negro Mt. Bog, 6 mi. SW of Grantsville2
- Patuxent Research Refuge, Plot 16862
- Patuxent Research Refuge, Plot 16872
- Patuxent Research Refuge, Plot 36412
- Patuxent Research Refuge, west shore of Cash Lake, Plot 43842
- Plummer's Island in the Potomac River, near Cabin John2
- Plummers Island, in the Potomac River near Cabin John2
- Region between Leornardtown & Millstone.2
- Salisbury2
- Sheppard Asylum2
- Sligo Creek2