Classification of the Italian A. altissima forest communities and box plots of the life forms. (a) Dendrogram from the phytosociological relevés of the A. altissima communities in the study area and published relevés from Fanelli (2002). Cluster I, Asparago acutifolii-Ailanthetum altissimae; Cluster II, Aro italici-Ailanthetum altissimae. (b) Comparison of the significant life form and EIVs of the two A. altissima forest associations (AspAil: Asparago acutifolii-Ailanthetum altissimae and AroAil: Aro italici-Ailanthetum altissimae) through box plots. (b.1) Geophytes p value <0,0001, (b.2) Phanerophytes p value <0,0001; (b.3) Terophytes p value = 0.001; (b.4) Temperature EIV p value =0.04.