This newly designed critical supplementary volume expands the base and atlas volume of the Rothmaler Excursion Flora and enables the identification of about 700 species from plant genera of the German flora that are crucial for identification. Recognized experts have contributed to the following groups: Ranunculus auricomus (golden-crowned buttercup) - Volker Melzheimer; Rubus (blackberry, raspberry) - Heinrich E. Weber; Sorbus (mountain ash, rowan) - Norbert Meyer; Hieracium laevigatum (smooth hawkweed) - Siegfried Bräutigam; Taraxacum (cow flower, dandelion) - Ingo Uhlemann, Jan Kirschner, Jan Stpánek. The identification keys have been updated and completely revised in many parts. They reflect the current state of taxonomic research and provide information on ecology and distribution in Germany. Detailed accompanying texts lead to the respective genera.