TY - JOUR T1 - Polypogon maritimus, een miskende neofyt in Belgiƫ JF - Dumortiera Y1 - 2008 A1 - Filip Verloove A1 - Dirk De Beer A1 - Bart van de Vijver A1 - Walter Suys SP - 26 EP - 28 VL - 93 ER - TY - JOUR T1 - Myriophyllum heterophyllum, een nieuwe invasieve waterplant JF - Dumortiera Y1 - 2008 A1 - Dirk De Beer A1 - Rembrandt De Vlaeminck SP - 8 EP - 13 AB - Myriophyllum heterophyllum, a new aquatic invasive exotic species. In the Anti-tank Ditch ('Antitankgracht') north-east of Antwerp a large population of Myriophyllum heterophyllum Michaux was discovered. Further research indicated this species is present at other locations in the province of Antwerp. Vegetative differences with native species of Myriophyllum are discussed. VL - 94 ER -