The following bibliography has been generated by bringing together all references provided by our content partners. There may be duplication.

References

• 1906. In: Rhodora 8: 93
• Fernald, M. 1950. Manual (ed. 8) i–lxiv, 1–1632. American Book Co., New York.
• Govaerts R. (ed). For a full list of reviewers see: http://apps.kew.org/wcsp/compilersReviewers.do (2013). WCSP: World Checklist of Selected Plant Families (version Oct 2011). In: Species 2000 & ITIS Catalogue of Life, 11th March 2013 (Roskov Y., Kunze T., Paglinawan L., Orrell T., Nicolson D., Culham A., Bailly N., Kirk P., Bourgoin T., Baillargeon G., Hernandez F., De Wever A., eds). Digital resource at www.catalogueoflife.org/col/. Species 2000: Reading, UK.
• Great Plains Flora Association. 1986. Fl. Great Plains i–vii, 1–1392. University Press of Kansas, Lawrence.
• Hilty, J. Editor. 2013. Illinois Wildflowers. World Wide Web electronic publication. flowervisitors.info, version 04/2013.
  See: Botanical Terminology and Line Drawings,  Ecological Terminology,  Website Description,  Links to Other Websites,  Reference Materials
• Hilty, J. Editor. 2013. Insect Visitors of Illinois Wildflowers.   World Wide Web electronic publication. illinoiswildflowers.info, version (05/2013)  
  See:   Abbreviations for Insect Activities,   Abbreviations for Scientific Observers,   References for behavioral observations
• Possible type: Cockerell, T. D. A., et al. 1901. Proc. Biol. Soc. Washington. 14 (35): 178.
• Scoggan, H. J. 1978 [1979]. Pteridophyta, Gymnospermae, Monocotyledoneae. 2: 93–545. In Fl. Canada. National Museums of Canada, Ottawa.
• Small, J. K. 1933. Man. S.E. Fl. i–xxii, 1–1554. Published by the Author, New York.