The book "Flowering Plants. Eudicots" is the ninth volume of a comprehensive series that focuses on the systematics and diversity of eudicots. This volume covers 52 plant families with a total of 432 genera from 13 eudicot orders, many of which have been newly classified. Special attention is given to the early-diverging eudicots and the basal-core eudicots, with an in-depth discussion of their phylogenetic relationships and diversification. The work provides systematically relevant information, including detailed descriptions of the families and genera, as well as keys to the genera and references to current revisions. The introductions to the families offer comprehensive and in-depth insights into essential aspects of systematics. The abundance and precision of the information make this book an important reference source for scientists and practitioners in the fields of pure and applied plant sciences.