The following bibliography has been generated by bringing together all references provided by our content partners. There may be duplication.
- 1803. In: Fl. Bor.-Amer. (Michaux): 166.
Hilty, J. Editor. 2015. Insect Visitors of Illinois Wildflowers. World Wide Web electronic publication. illinoiswildflowers.info, version (09/2015)
See: Abbreviations for Insect Activities, Abbreviations for Scientific Observers, References for behavioral observations
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