| | Open Tree of Life reference taxonomy version 3.2 @en | |
| | Charles Sprague Sargent @en | |
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| | Taxonomy database of the U.S. National Center for Biotechnology Information @en | |
| | Global Biodiversity Information Facility @en | |
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| | Database of Vascular Plants of Canada @en | |
| | GRIN Taxonomy for Plants @en | |
| | United States Department of Agriculture Plants Database @en | |
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| | Plants of the World Online @en | |
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| | Integrated Taxonomic Information System @en | |
| | International Plant Names Index @en | |