Map of western Canada showing the locations of 51 genotyped samples of Phalaris arundinacea. Dotted line indicates the Province of British Columbia. Red dots show the locations of the “short” ribotypes (n = 13); blue “long” (n = 32) and orange putative hybrids (n = 6). Only three placeholder specimens are given for Elk Island National Park (arrowed; see additional map Suppl. material 4). Sample details are given in Tables 1, 2 and Suppl. materials 1, 2, 3.