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U.S. Department of Agriculture
National Invasive Species Information Center
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Invasive Species Resources

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Horus Institute of Environmental Development and Conservation
Instituto Hórus de Desenvolvimento e Conservação Ambiental (Horus Institute of Environmental Development and Conservation, Brazil).
Special Note: Site in Portuguese and Spanish
Laboratorio de Invasiones Biológicas
Universidad de Concepción (Chile).
Special Note: In Spanish
Neophytes
Info Flora (Switzerland).
Special Note: Site in English, German, French, and Italian.
Programa de Especies Invasoras de México

Comisión Nacional Para el Conocimiento y Uso de la Biodiversidad (National Commission for the Knowledge and Use of Biodiversity, Mexico).

Special Note: In Spanish
Weeds of Mexico / La flora interactiva de las malezas de México
Colegio de Postgraduados en Ciencias Agrícolas. Mexico.
Special Note: In Spanish