Title: Correspondence
Subjects: Correspondence, Plants, Botanical specimens, Potamogeton spirillus, Habitat, Seasonal variations, Water requirements, Alismataceae, Ecology, Najas, Potamogeton natans, Potamogetonaceae, Size
Places: Ipswich River, Massachusetts
People: Charles Edward Faxon (1846-1918), George Engelmann (1809-1884), Benjamin Lincoln Robinson (1864-1935)