- Lower end of Patuxent Research Refuge, plot 31851
- Lower end of Refuge, Plot 2129, Patuxent Research Refuge1
- Millers1
- Monie Creek, about 3 miles northwest of Princess Anne1
- NW end of Plummer's Island1
- Near Baltimore, by Franklin Road1
- Near Havre-de-Grace1
- Near Reeds Lock in swamp, Chesapeake & Ohio Canal1
- On trail along Youghiogheny River to Muddy Creek Falls, Swallow Falls State Forest, 8 mile NNW Oakland1
- Open trail, Seepage Forest, W. shore of Cash Lake, Plot 4384, Patuxent Research Refuge1
- Paint Branch Creek, 2¼ miles west of Beltsville1
- Paint Branch, near White Oak1
- Patuxent Research Refuge1
- Patuxent Research Refuge, Bottomland Forest near River NE of buildings, Plot 36661
- Patuxent Research Refuge, Cash Lake, Plot 43841
- Patuxent Research Refuge, NE of buildings and river, plot 36391
- Patuxent Research Refuge, NW of buildings Plot 16781
- Patuxent Research Refuge, Plot 16771
- Patuxent Research Refuge, Plot 16791
- Patuxent Research Refuge, Plot 26661