The following bibliography has been generated by bringing together all references provided by our content partners. There may be duplication.
- Flora of North America Editorial Committee, e. 2006. Magnoliophyta: Asteridae, part 8: Asteraceae, part 3. Fl. N. Amer. 21: i–xxii + 1–616.
Hilty, J. Editor. 2015. Insect Visitors of Illinois Wildflowers. World Wide Web electronic publication. illinoiswildflowers.info, version (03/2015)
See: Abbreviations for Insect Activities, Abbreviations for Scientific Observers, References for behavioral observations
- Species Plantarum 2: 919. 1753. (1 May 1753) (Sp. Pl.)
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