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