Résumé.-Les auteurs indiquent à l'aide de cartes grilles (type IFFB) la distribution géogra-phique des Renoncules aquatiques dans le nord de la France.Ils précisent les caractères phytosociologiques des différentes espèces en insistant sur Ranun· culus aquatilil, R. baudotii et R. peltatus.Summary.-The authors show with grilled map (type IFFB) the geographical distribution of the aquatic subgenus Batrachium in Northem France.They give the phytosociological characters of the different species emphasizing on Ranunculus aquatilis, R. baudotii and R. peltatus.
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