Hvor Ugras
Nord-Amerika | Weed Science Society of America (2010) - Composite List of Weeds |
Europa | NOBANIS - European Network on Invasive Alien Species |
Sør-Asia | K. Moody (1989) - Weeds Reported in Rice in South & Southeast Asia |
Sørøst-Asia | K. Moody (1989) - Weeds Reported in Rice in South & Southeast Asia |
Australia | R.P. Randall (2007) - The Introduced Flora of Australia and its Weed Status |