Synantropization indices of urban floras: an attempt at definition and assessment

The objective of this paper is to present the principle and results of selecting floristic parameters which best reflect the effects of different intensity and duration of anthropopressure within the borders of a large urban agglomeration (exemplified by Warsaw). Those parameters which in particular take into account such quantities as, for example, the percentage of kenophytes, therophytes-newcomers, permanently established synanthropes and so on, make it possible to assess the degree of advancement of flora synanthropization, including its temporal aspect. The results indicate that the selected parameters (especially their 3- or 6-component complexes) could also be of importance as indices of flora synanthropization in other cities, when floristic lists from different anthropopressure zones within each city are compared.