Rezentvorkommen von Adventivpflanzen und Apophyten auf Bahnhöfen im mittleren Westfalen und ihre Ausbreitungstendenzen

The spatial distribution and dispersal dynamics of adventive plants and apophytes at the major railway lines and stations in the middle part of Westphalia (including the more extended part of the Ruhrgebiet, the biggest urban-industrial agglomeration in Germany) are discussed. Remarkable dynamics of migration and colonization of railway areas have taken place within the last few years. The recent range extension is illustrated by representatively railway plants (Geranium purpureum VILL., G. rotundifolium L., Tragopogon major JACQ.).