Flora esotica d'Italia : nuovi dati per l'Emilia-Romagna

The manuscript discusses some news concerning the naturalized and casual Italian alien flora. Some significant specimens collected in the area between Piacenza and Parma (Regione Emilia-Romagna) are illustrated. Coreopsis lanceolata L., Crepis dioscoridis L., Egeria densa Planch., Erigeron strigosus Muhlenb. ex Willd., Heracteum mantegazzianum Sommier & Levier, Najas gracillima (A.Braun) Magnus, Rudbeckia laciniata L. var. laciniata, Symphyotrichum novae-angliae (L.) G.L.Nesom and Symphytum asperum Lepech. are naturalized neophytes that have never been found before or for a long time in Emilia-Romagna; Alcea biennis Winterl subsp. biennis, Broussonetia papyrifera (L.) Vent., Hemerocallis fulva (L.) L., Lemna minuta Kunth, Lepidium didymum L., Oxalis dillenii Jacq., Syringa vulgaris L. and Vitis labrusca L. are naturalized neophytes that have never been observed before or for a long time in the area of Piacenza; Bergenia crassifolia (L.) Fritsch, Callistephus chinensis (L.) Nees, Canwpteris ×clandonensis Hort., Koelreuteria paniculata Laxm., Oenothera chicaginensis Renner ex R.E.Cleland & Blakeslee, Oxalis purpurata Jacq., Phyllostachys edulis (Carriere) Houz., Rudbeckia hirta L. var. hirta, Tagetes erecta L. and Tamarix parviflora DC. are occasional neophytes tha may become soon established in Emilia-Romagna.