| centaurea nigrescens | | Canada: Ontario, Essex Co., Beach near Yarmouth | | 1316024054 |
| centaurea nigrescens | | Canada: Ontario, Nipissing Dist., Conrad's Beach, West Lawrencetown. | | 1316027236 |
| centaurea nigrescens | | canada: ontario, essex co., beach near yarmouth | | 1331394452 |
| centaurea nigrescens | | Canada: Ontario, Grey Co., Railway | | 1316020878 |
| centaurea nigrescens | | Canada: Ontario, rare Charitable Research Reserve, Blair Flats | | 930159682 |
| centaurea nigrescens | | Canada: Ontario, rare Charitable Research Reserve, Blair Flats | | 929982134 |
| centaurea nigrescens | | canada: ontario, nipissing dist., conrad's beach, west lawrencetown. | | 1331395705 |
| centaurea nigrescens | | canada: ontario, waterloo r. m., ca. 25 mi w of dillon in pass to big hole valley. | | 1331395079 |
| centaurea nigrescens | | canada: ontario, grey co., railway | | 1331393166 |
| centaurea nigrescens | | Canada: Ontario, Waterloo R. M., Ca. 25 mi W of Dillon in pass to Big Hole Valley. | | 1316025596 |