By Reinhard Friedrich Stettler

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Meeuse made a more radical suggestion, based on a detailed look at floral features, proposing inclusion of Salix and Populus within the Flacourtiaceae (Meeuse 1976). There is much to recommend this merger, including occurrence of the distinctive salicin glycosides in some members of the Flacourtiaceae (Hegnauer 1973, 1989). Unfortunately, the suggestion cannot yet be intelligently implemented because of difficulties in the classification of the Flacourtiaceae themselves and of the Violales generally.

F. D. ) 1 Chapter 1. E. Eckenwalder) 7 Introduction 7 Definition of the genus Populus 7 Relationships of Populus 12 Classification of Populus 14 Evolution 19 Conclusions 30 References 30 Chapter 2. E. ) 33 Introduction 33 Adaptation to the growing period 35 Adaptation to climate 39 Morphology 41 Reproductive characteristics 43 Diseases and insects 44 Molecular genetics 44 Natural variation and wood production 47 Conclusions 48 Topics deserving further study 50 Acknowledgements 50 References 50 Chapter 3.

Species of each section with their generalized distributions. Abaso Turanga Leucoides Aigeiros Taeamahaca Populus W. Eurasia N. Africa euphratica nigra laurifolia alba tremula E. 1. l. l. l. E. Africa ilicifolia N. 1. (sensu lato) include others which are often recognized as distinct in the literature and which might be retained as subspecies. Some other species also contain additional subspecies or varieties. Page 17 species have already been added to the 60 recognized in the Flora Reipublicae Popularis Sinicae since its publication in 1984.

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