Proceedings of the Iowa Academy of Science Volume 36 Annual Issue Article 27 1929 Heliantheae of Iowa. I M. Rae Johns Let us know how access to this document benefits ouy Copyright ©1929 Iowa Academy of Science, Inc. Follow this and additional works at: https://scholarworks.uni.edu/pias Recommended Citation Johns, M. Rae (1929) "Heliantheae of Iowa. I," Proceedings of the Iowa Academy of Science, 36(1), 147-184. Available at: https://scholarworks.uni.edu/pias/vol36/iss1/27 This Research is brought to you for free and open access by the Iowa Academy of Science at UNI ScholarWorks. It has been accepted for inclusion in Proceedings of the Iowa Academy of Science by an authorized editor of UNI ScholarWorks. For more information, please contact
[email protected]. Johns: Heliantheae of Iowa. I HELIANTHEAE OF row A. I lVI. RAE JOIINS Heliantheae is one of the nine tribes of the Family Compositae. It is believed to have originated in South America soon after the appearance of the Family and may be regarded as the oldest and most primitive of the tribes. The near approach to the earliest composite form is said to be retained in the more foliaceous outer invol ucral bracts, the more normally developed and more firmly attached paleae subtending the disk flowers, the 0 less transformed calyx-limb of persistent teeth or aristae directly continuous with the ribs of the ovary, and in some genera, the less firmly united or nearly free anthers. (Bentham, 1873.) The characters which today distinguish it from the other tribes are: Receptacle: chaffy, depressed, horizontal, convex, or columnar.