Val Ferret, Courmayeur - Caltha palustris L.
Spontaneous flora and vegetation of Alessandria (Piedmont, Italy). A study of spontaneous urban flora and vegetation of Alessandria (Piedmont, Italy) is here presented. 240 different vegetal species belonging to 160 genera and 53 families were identified. Chorological and biological spectra have been elaborated and compared with those of other Italian cities. The phytosociological vegetational surveys, processed using classification and ordination programs, lead to the identification of omogeneous different vegetational types, ascribed to the classes Parietarietea judaicae, Molinio-Arrhenatheretea, Polygono-Poetaea annuae, Stellarietea mediae and Artemisietea vulgaris.
Alessandria (NW, Italy), phytosociology, urban flora and vegetation