- Cove Point Marsh, Cove Point, along the Chesapeake Bay.3
- Kent3
- Salisbury.3
- Annapolis.2
- Found at Cove Point Marsh, along the Chesapeake Bay.2
- Frederick2
- Harford2
- High Island.2
- Talbot2
- 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
- Allegheny, TNC glades.1
- Along Battle Creek.1
- Along Hwy Alt 40, ca 2 mi west of Grantsville, at Negro Mtn.1
- Along MD Rt 318 between Preston & Federalsburg, east of American Corner Road.1
- Along Potomac, SE of Great Galls. The Potomac Valley.1
- Along old US Highway 40 west of Green Ridge between Little Pine Lick Hollow & Ridge Road north of junction of Fifteen Mile Creek Road with US 40, about 6 air miles east of Flintstone.1
- Along the Potomac River at Piscataway Park just east of Mockley Point.1
- Along the beach at Millstone, region between Leonardtown & Millstone1