- Caroline1
- Contact UM Herbarium1
- Cunningham Falls State Park, 3.5 mi SW of Thurmont1
- Fishing Creek at bridge over Hamburg Rd Catoctin Mountain, 2½ miles NW Bethel1
- Hoyes Run1
- Liverpool1
- 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
- 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, Plot 16771
- Patuxent Research Refuge, Plot 16791
- Patuxent Research Refuge, Plot 16861
- Patuxent Research Refuge, Plot 26661