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- AABGA - American Association of Botanical Gardens
- Aquatic, Wetland and Invasive Plant Database
- Australian National Botanic Gardens - Growing, studying and promoting Australia's flora
- BBG - Brooklyn Botanic Garden
- Benvenuti tra le erbe
- Botanical Specialists and Literature
- Boyce Thompson Arboretum
- BSPP - The British Society for Plant Pathology
- Canadian Botanical Association
- Center for Biodiversity and Conservation Biology
- Center for Plant Biodiversity Research and Australian National Herbarium - Botanical Research, Conservation, Management and Use of the Australian Flora
- CSIRO - Plant Industry
- Cyberbotanica - Plants and Cancer Treatments
- EnviroPlants Research
- Internet Directory for Botany - Alphabetical List
- IOPI - International Organization for Plant Information
- Jerusalem Botanical Garden
- Le Parc National de Port-Cros - Le Conservatoire Botanique National
- Missouri Botanical Garden
- New York Botanical Garden
- Oasis Botanical Sanctuary
- Plant Patholgy Online - The American Phytopathological Society
- Plants and Programs - Horticulture and Molecular Biology
- Plants for a Future - A Resource and Information Centre for Edible and other useful plants
- Smithsonian Institution - Department of Botany - National Museum of Natural History
- Tabacco
- The Charms of Duckweed
- University of Alberta - Devonian Botanic Garden
- USDA - Plants National Database