Résumé :
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This book is "intended as an identification guide rather than a taxonomic monograph" for those who are "reasonably familiar" with botany. the first third is an introduction to the biology of potamogeton species in the british isles, and includes chapters on prehistory, nomenclature, classification, evolution, hybridisation, structure, life history, habitats, distribution, and collection and preservation. the descriptions of the two plant families is based on morphological characters which can be seen with unaided eye, the hand lens or the binocular microscope. the second part of the book presents two keys to 50 species.
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