| Pages liminaires 
                  
                    
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              | Préface: Editorial 
                  
                    
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              | Article: Soil characteristics and Chusquea bamboos in the Quercus forests of the Cordillera de Talamanca, Costa Rica 
                  
                    
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                 | 3 | 
            
              | Article: Lemna yungensis, a new duckweed species from rocks of the Andean Yungas in Bolivia 
                  
                    
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                 | 15 | 
            
              | Article: Does mowing in summer reduce the abundance of common reed (Phragmites australis)? 
                  
                    
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                 | 23 | 
            
              | Article: Habitat use of foraging skylarks (Alauda arvensis L.) in an arable landscape with wild flower strips 
                  
                    
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                 | 37 | 
            
              | Article: Review : Notes on the ecological restoration of fen meadows, ombrogenous bogs and rivers : definitions, techniques, problems 
                  
                    
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                 | 47 | 
            
              | Article: Research Note : the appearance of two duckweed species in sewage effluents in Yaoundé (Cameroon), and their possible use for sewage treatment and feed production 
                  
                    
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                 | 63 | 
            
              | Article: Research Note : Untersuchungen zur Trollius - Chiastocheta-Interaktion in kleinen, isolierten Pflanzenpopulationen 
                  
                    
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                 | 69 | 
            
              | Article: Research Note : the N:P ratio and the nutrient limitation of wetland plants 
                  
                    
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                 | 77 | 
            
              | Article: Research Project : zur relativen Bedeutung von Nährstoffeintrag und Wasserstand für die Biodiversität in Streuwiesen 
                  
                    
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                 | 91 | 
            
              | Article: Research Project : testing speciation mechanisms in orchids witz molecular and ecological methods 
                  
                    
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                 | 103 | 
            
              | Rubrique: Summaries of diploma and PhD theses (1997) 
                  
                    
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                 | 109 | 
            
              | Informations des associations: Annual report of the Geobotanical Institute ETH (1997) 
                  
                    
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              | Publicité 
                  
                    
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              | Table des matières 
                  
                    
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