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The International Plant Names Index (IPNI) is a database of the names and associated basic bibliographical details of seed plants, ferns and fern allies.
- Canadian Poisonous Plants Information System
- Global Invasive Species Database
- Invasive Plant Atlas of the United States
- Fact Sheets on invasive alien plants in the U.S.
- PLANTS database contains information about approximately 83,000 taxa in the U.S.
- Plant Evolution Timeline
- Botanius is a portal to historical Botanical literature
- AlgaeBase is a database of information on algae
- The Mycology.Net contains information about diversity of fungi