By Order of Importance:
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Herbal Safety in Pregnancy and Lactation
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Bitter Herbs
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Tannin Database (external link)
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Salicylate Content of Herbs
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Chemistry and Actions by Botanical Family
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Herb-Drug Interactions
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Drugs Derived from Natural Products
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East Asian Medicinal Herb Names and Properties
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Saponin-Rich Herbs
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Ecological Status of Herbs
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Herbs and Antibiotics in Combination
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Weiss's Herbal Medicine Therapeutic Index
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Polycrest Herbs
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Herbal Safety in Organ Transplants
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Pyrrolizidine Alkaloids
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Serenoa repens clinical trial database
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Edible Plants of the World (external link)

Alphabetic Order:

Dark box = external link. Light box = database native to this website.