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P R E F A C E T O T H E S E C O N D E D I T I O N 6LQFHWKHSXEOLFDWLRQRIWKH¿UVWHGLWLRQRISmartweeds to Hazelnuts in 1987, twelve additional species and one hybrid of plants covered by this book have been discovered in Illinois. In addition, numerous nomenclatural changes have occurred for plants already known from the state, and a great number of county records have been added. Several new keys have also been written. This second edition of Smartweeds to Hazelnuts is intended to update the status for the plant families covered in this book. Original illustrations for all the new species and the hybrid have been prepared by Paul W. Nelson. xiii ...

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