America de Nord | Plants of the World Online |
America de Sud | Inter-American Biodiversity Information Network |
UK și Irlandei | Online Atlas of the British & Irish Flora |
Asia de Est | Plants of the World Online |
Rusia | Plants of the World Online |
Asia Centrala | Plants of the World Online |
Australia | R.P. Randall & O. Kessal (2004) |
Noua Zeelandă | C. Howell (2008) - Consolidated List of Environmental Weeds in NZ |
