- Along the Potomac River west of Cabin John1
- Annapolis1
- Baltimore1
- Baltimore, Catholic Orphanage Grounds, Cold Spring Lane and Roland Avenue1
- Bank of Wicomico River, Camp St. Charles, Rock Point1
- Bank of Yaughiogheny River below Swallow Falls, 8 miles NNW Oakland1
- Beside apple orchard, South Farm, Plant Industry Station, 2 miles SW Beltsville1
- Bethesda1
- Bluff forest N.W. of buildings, Plot 1679, Patuxent Research Refuge1
- Bluff forest N.W. of buildings, Plot 2670, Patuxent Research Refuge1
- Burnt Hills1
- Cabin John Run between C. J. and Wildwood1
- Caroline1
- Cedar Hill Cemetary, 2 miles NW Suitland1
- 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
- Loch Raven Reservoir near junction of Jarrettsville and Dulaney Valley Rds.1