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References
- ↑ Wilhelm, Gerould; Rericha, Laura (2017). Flora of the Chicago Region: A Floristic and Ecological Synthesis. Indiana Academy of Sciences.
- ↑ Wilhelm, Gerould. "The Origin of Flora of the Chicago Region: A Floristic and Ecological Synthesis". Conservation Research Institute. Retrieved 2018-02-16.
- ↑ IPNI. G.Wilh.
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