The third and final volume in botanist Robert H. Mohlenbrock's comprehensive sequence of books on the aster family in Illinois. In this volume, Mohlenbrock identifies 128 species in 49 genera with 11 hybrids and 57 lesser taxa. He provides an easy-to-use key to the genera and species and a complete description and nomenclatural and habitat notes for each plant, including its uses, if applicable.
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