Document
Illinois Natural History Survey: Results of an Investigation on Endangered Plants Without Known Extant Populations, and Recommendations for Changes in Their Listing StatusMarch 11 1988
Bowles, Marlin L., Robertson, Kenneth R., Burton, Philip J., Ketzner, David M., Solecki, Mary Kay, Taft, John B., Ulaszek, Eric F.
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Rarely seen endangered plants, rediscoveries, and species new to Illinois1991
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