The investigation of biodiversity, particularly in the ‘hotspots’, begins with the identification of living objects – the animals, fungi, and plants comprising the ecosystem. In the field conditions, it is important to reveal the attribution of the object to a taxon of higher level – to one or another family (this identification is later checked in the lab and can be corrected). This book describes for the first time in details morphological characters of all modern angiosperm families both in a wide sense (419 families according to newest molecular data) and narrow sense (more than 900 infrafamilial ‘morphological groups’). The book is illustrated with original photos, which show the principal morphological characters of the overwhelming majority of families of flowering plants which are important for their identification. This book will be interesting for taxonomists and phylogeneticists, evolutionary biologists, practicing nature conservationists, as well as for students specializing in various fields of plant sciences.