| Front matter | _ | 
            
              | Article: Biosystematic investigation in the family of duckweeds ("Lemnaceae"). Vol. 2 : the family of "Lemnaceae" : a monographic study. Volume 1 | 1 | 
            
              | Front matter | 1 | 
            
              | Chapter : Publications on "Biosystematic investigations in the family of duckweeds (Lemnaceae) | 2 | 
            
              | Table of Contents | 3 | 
            
              | Chapter 1: Introduction | 7 | 
            
              | Chapter 2: Morphological characteristics : variability and function | 13 | 
            
              | Chapter 3: Karyology | 129 | 
            
              | Chapter 4: Habitat demands and ecological behavior | 138 | 
            
              | Chapter 5: Position within the ecosystem | 186 | 
            
              | Chapter 6: Geographic distribution : distribution pattern | 229 | 
            
              | Chapter 7: Systematic position, taxonomical relations, species differentiation | 410 | 
            
              | Chapter 8: Nomenclature | 436 | 
            
              | Chapter 9: Description of family, genera, and species of Lemnaceae with key for determination | 461 | 
            
              | Index: Abbreviations | 553 | 
            
              | Index: List of the figures and plants in volume 1 | 555 | 
            
              | Index: Index of subjects and names of plants | 559 | 
            
              | Index: Contents of vol. 2 | 565 | 
            
              | Index: Veroeffentlichungen des Geobotanischen Institutes der Eidg. Techn. Hochschule, Stiftung Ruebel, in Zuerich | _ |