New distributional records of non-native vascular plants in northern Italy Author Verloove, Filip Botanic Garden of Meise, Nieuwelaan 38, B- 1860 Meise, filip.verloove@br.fgov.be Author Ardenghi, Nicola M. G. Department of Earth and Environmental Sciences, University text Natural History Sciences 2015 2015-06-30 2 1 5 14 http://dx.doi.org/10.4081/nhs.2015.219 journal article 10.4081/nhs.2015.219 2385-0922 12523705 Bidens vulgatus Greene , Pittonia , 4 (21): 72. 1899 . [ Fig. 2 ] ( Asteraceae ) Naturalized neophyte new to the flora of Lombardia and Emilia-Romagna ( Conti et al. , 2005 ; Celesti-Grapow et al. , 2009a ; Banfi & Galasso, 2010 ). ITALY . Lombardia . Prov. Cremona: Casalmaggiore, river Po, damp track in woodland, locally frequent, 14.09.2014 , F . Verloove 11090 ( BR , MSNM ); Prov. Pavia: Gambolò, Cascina Portalupa ( UTM ED 50: 32 T 495784.5013034), margine di sentiero in querco-carpineto, con Erigeron canadensis , Prunella vulgaris , Glechoma hederacea , 73 m , 17.10.2014 , N . Ardenghi, P . Cauzzi & S . Pedrini ( MSNM ); Prov. Pavia: Stradella, San Zeno, sponda destra del torrente Versa all’incirca all’altezza della rotonda tra viale Resistenza e la SP 201 ( UTM ED 50: 32 T 524108.4989963), vigneto, 86 m , 18.10.2014 , N . Ardenghi ( MSNM ); Prov. Milano: Milano, stazione FFSS di Milano-Rogoredo ( UTM ED 50: 32 T 518642.5031188), aiuola, 109 m , 28.11.2014 , N . Ardenghi ( MSNM ) . This is a widespread species in North America ( Strother & Weedon, 2006 ). Like the preceding, it is poorly known and overlooked in Europe, although known since many decades (e.g. Schumacher, 1941 ; Debray, 1963 ). Up to present it was known in Italy only from Friuli-Venezia Giulia ( Celesti-Grapow et al. , 2009a ). Bidens vulgatus is much reminiscent of B. frondosus L . but often more robust with larger flower heads and with a higher number of calyculi (10-16 vs. usually 8). In addition to the localities cited above, it was also detected along river Po in Boretto ( Emilia-Romagna ). It may have been widely overlooked elsewhere.