The following bibliography has been generated by bringing together all references provided by our content partners. There may be duplication.
- 1818. In: Gen. N. Amer. Pl. [Nuttall] 1: 188.
- Flora Boreali-Americana 1: 169. 1803. (Fl. Bor.-Amer.)
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
- Image metadata at Bioimages (http://bioimages.vanderbilt.edu/) http://bioimages.vanderbilt.edu/baskauf/00000
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