TY - JOUR T1 - Petasites japonicus en voie de naturalisation dans le sud de la province de Hainaut (Belgique) JF - Dumortiera Y1 - 2010 A1 - Jean-Michel LECRON SP - 13 EP - 22 AB - Petasites japonicus is naturalizing in the south of the province of Hainaut (Belgium). Petasites japonicus subsp. giganteus was discovered in a small waste ground (probably an old garden) along a former railway line at Sivry-Rance (Walloon province of Hainaut, Belgium). Only male plants were found. An identification key to the four species of the genus Petasites occurring in Belgium, phenological observations, a description of the habitat of this neophyte, and an overview of records in Belgium are provided. The mode of introduction and its status in Wallonia are discussed. VL - 98 ER -