This book focuses on new derivations of the unique Crepis rubra x C. foetida hybrid. The author analyzes traits and their recombination in both selfed generations to understand the potential for novel species arising through amphidiploidy in Crepis. The research presented provides insight into the limits of gametogenesis and fertilization in an amphidiploid context, and explores the potential for stable derivative lines with enhanced fertility. The author argues for the role of amphidiploidy in the evolution of Crepis species and discusses how these insights contribute to our understanding of speciation and the emergence of new species.