Place
- Pennsylvania1
- Pigeon Creek Country Park, trail along high ridge adjacent to Pigeron River bottomlands1
- Porcupine Mountains1
- Port Huron, near1
- Ralph, ca 7 mi NE of1
- Rapid River, ca 7 mi N1
- Riggsville Corners, near1
- Riverside Twp, ca 1 mi NE of McBain1
- Round Lake1
- Santa Clara to Cerro Pando.1
- Santo Domingo1
- Sayre. Flora of the Upper Susquehanna1
- South Haven, Black River Woods1
- Southfield Twp., Basset Beech forest. Sect. 3.1
- St. Clair1
- Stephenson, near1
- Third Woods, Ann Arbor1
- Trout Lake, 3 mi E1
- Van Buren1
- Veracruz1