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- Royal Horticultural Society
- 21 nov 2014
- https://www.rhs.org.uk/plants/search-form
- Royal Horticultural Society
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- NCCAM Herbs at a Glance
- National Center for Complementary and Integrative Health
- https://nccih.nih.gov/health/herbsataglance.htm
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- MedlinePlus Herbs and Supplements
- National Institutes of Health
- 2014
- http://www.nlm.nih.gov/medlineplus/druginfo/herb_All.html
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- Encyclopedia of Herbal Medicine
- Andrew Chevallier
- 2000
- Dorling Kindersley Adult
- 2nd
- 336
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- USDA PLANTS DATABASE
- Natural Resources Conservation Service
- 23 jul 2014
- http://plants.usda.gov/java
- United States Department of Agriculture (USDA)