The riparian flora of the Oker river system : (Europe, Northern part of Germany)

Flora and vegetation of riverbanks are examined by us europewide with emphasis to the Weser and Elbe river. The riparian flora of the Oker and its major tributaries as a part of the Weser system were investigated most intensively by a standardized method. Species richness and most frequent species of different rivers just as different reaches of the Oker are compared with each other. Special attention was paid to spread and establishment of alien plants