Since the publication of the first edition of this book in 1987, thirteen additional species and one hybrid have been discovered in Illinois. In addition, numerous nomenclatural changes have occurred for plants already known. This second edition updates the status of the Polygonaceae, Hamamelidaceae, Platanaceae, Fagaceae, Betulaceae and Corylaceae in Illinois.
Each of the newly discovered species has been added and is fully illustrated. Updated nomenclature as well as Illinois distributional data are included for each species. In addition to the fourteen new plant illustrations, the appendix contains new information on the descriptions and the geographical locations of plants in the first edition, and revised identification keys.
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Robert H. Mohlenbrock taught botany and plant taxonomy at Southern Illinois University for thirty-four years. His research has resulted in the publication of fifty-nine books and more than five hundred other publications.