Hvor Ugras
Nord-Amerika | Weed Science Society of America (2010) - Composite List of Weeds |
Sør-Amerika | Inter-American Biodiversity Information Network |
Europa | NOBANIS - European Network on Invasive Alien Species |
Forente Kongerike og Irland | Online Atlas of the British & Irish Flora |
Middelhavet | E.D. Dana, M. Sanz-Elorza & E. Sobrino (2001) |
Øst og Vest Afrika | Plants of the World Online |
Australia | R.P. Randall & O. Kessal (2004) |
New Zealand | Pacific Island Ecosystems at Risk (PIER) |
Stillehavsøyene | Pacific Island Ecosystems at Risk (PIER) |