"Since the publication of the first edition of Robert H. Mohlenbrock's Grasses: Panicum to Danthonia in 1973, twenty additional taxa of grasses have been discovered in Illinois that are properly placed in this volume. In addition, numerous nomenclatural changes have occurred for plants already known from the state, and many distributional records have been added. This second edition updates the status of grasses in Illinois. Paul W. Nelson has provided illustrations for all the additions." "The drawings that accompany the descriptive material make this book essential to those seeking to broaden their knowledge of grasses."--Jacket.