Notes on Plants of the Eastern United States

In the course of field observation and collecting of plants in various parts of the eastern United States, certain notes have accumulated which seem worth placing on record. Also, a number of names have been used in lists of determinations and in labelling specimens which should be published, even though, in some cases, study is continuing on the problems concerned. Taxa belonging to the genera Equisetum, Setaria, Acer, Oenothera, and Hedyotis are discussed in this paper.