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GENERAL

Invasive Plant Council of British Columbia

Alien Plant Invaders of Native Areas

An Assessment of Exotic Plant Species of Rocky Mountain National Park (Colorado)

Canadian Botanical Conservation Network

Center for Invasive Plant Management (Washington State)

Global Invasive Species Database

Invaders Database System

Invasive Plants of Southwestern British Columbia

Invasivespecies.gov (USA)

Resources on the Web about Invasive Plants (USA)

U.S. Federal Noxious Weed Program


SPECIFIC WEEDS

A Global Compendium of Weeds

Purple Loosestrife InfoCentre (Manitoba)

Jointed goatgrass (Washington)

Japanese Knotweed Alliance (United Kingdom)

Yellow Starthistle