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This latest edition of Vascular Flora of Illinois includes over thirty-four hundred species of flora from Illinois, adding more than 250 newly-recognized plants to this definitive collection. Because cataloguing our heritage is foremost in importance among naturalists, this book compiles essential information about plants in Illinois. Mohlenbrock includes all known taxa native to Illinois either at present or in the past and all non-native vascular plants that grow spontaneously and appear able to maintain themselves year after year without cultivation. The sequence of groups in the guide is ferns, coni­fers, and flowering plants, with cotyledons given before monocotyledons. Within each group, the fami­lies are arranged alphabetically, as are the genera within each family and the species within each genus. For each taxon recognized in this book, Mohlenbrock gives us a common name if one is generally used in Illinois. He follows this with an indication of flowering time for flowering plants, and of spore-production time in the case of ferns and their relatives. He also provides a habitat statement and a general comment on distribution in Illinois for each taxon.

Containing information on Illinois flora not available anywhere else, this fourth edition of Vascular Flora of Illinois is essential for ecologists, environmentalists, and land developers. Those interested in wildflower identification will also find this guide helpful.