USDA - NRCS Plants Database
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Plant characteristics database including alternative crops, classification, culturally significant, excluded names, fact sheets, invasive & noxious, threatened & endangered and more.
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The Calfora Database
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Information about the vascular plants of California
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Agricultural Research Service - Germplasm Resources Information Network Taxonomy
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Databases on plant, animal, microbial and invertebrate species of United States.
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Flora of North America
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Comprehensive systematic account of the plant species north of Mexico
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The Biota of North America Program
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Founded in 1969, this program has developed a database of all vascular plants and vertebrate species north of Mexico.
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International Organization for Plant Information
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Cooperative management of plant taxonomic databases
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Atlas of Florida Vascular Plants
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Searchable database of the vascular plants of Florida
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AlgaeBase
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Taxonomic and distribution details of approximately 20,000 seaweeds and seagrasses.
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