2011: The International Plant Names Index (IPNI), 2007 - 2011; The International Plant Names Index, botanical information system from the Royal Botanic Gardens, Kew, the Harvard University Herbaria, and the Australian National Herbarium, available at http://www.ipni.org/index.html
database: Malpighiales of North America Update; Updated for ITIS by the Flora of North America Expertise Network, in connection with an update for USDA PLANTS (2007-2010)
database: The PLANTS Database; National Plant Data Center, NRCS, USDA. Baton Rouge, LA 70874-4490 USA. http://plants.usda.gov
database: Kew family checklist, 2011; Kew World Checklist of Selected Plant Families, botanical information system at the Royal Botanic Gardens, Kew, available at http://apps.kew.org/wcsp/home.do
database: The PLANTS Database; National Plant Data Center, NRCS, USDA. Baton Rouge, LA 70874-4490 USA. http://plants.usda.gov
