The first paper on Heliantheae of Iowa included the genera Galinsoga, Eclipta, Actinomeris, Parthenium, Polymnia, Ambrosia, Iva, and Xanthium. This list was made up of the introduced, the doubtful, and some of the obnoxious weed species of the Tribe Heliantheae. The review covered the history and the distribution of the species in the United States and in Iowa. In the descriptions of the species, emphasis was laid on the minute details of the floral structures in the effort to bring out the distinctive and possibly hitherto unnoted features that mark the species.
Proceedings of the Iowa Academy of Science
©1930 Iowa Academy of Science, Inc.
Johns, M. Rae
"Heliantheae of Iowa II,"
Proceedings of the Iowa Academy of Science, 37(1), 161-208.
Available at: https://scholarworks.uni.edu/pias/vol37/iss1/30