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Place
- Patuxent Research Refuge, lower part of Refuge, east side Plot 31411
- Patuxent Research Refuge, north Telegraph Road, plot 44751
- Patuxent Research Refuge, under Willow Oak Barn on Kluckhuhn Road, Plot 54411
- Patuxent Research Refuge, upland oak region of lower end of Refuge, Plot 21561
- Patuxent Wildlife Refuge, 4 miles SE Laurel1
- Piscataway Park, National Colonial Farm, pond edge near parking area near main office.1
- Piscataway Park, near western entrance to Accokeek Creek boardwalk.1
- Plant Industry Station, 1 mile south of Beltsville1
- Plot 3641, Patuxent Research Refuge.1
- Plot 3695, n.e. of buildings, Patuxent Research Refuge.1
- Powdermill "Bogs", Ashfield Rd., 2 miles west of Beltsville1
- River NE of buildings, plot 3701, Patuxent Research Refuge1
- Suitland Bog north of the junction of Suitland Parkway & Suitland Road.1
- Swamp near Reids Loch, Chesapeake & Ohio Canada1
- USDA Plant Industry Station, 1 mile S. BELTSVILLE1
- Vicinity of Ardwick1
- east of laboratory, Patuxent Wildlife Refuge, 4 miles southeast of Laurel1