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IUCN/SSC Cycad Specialist Group

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World List of Cycads

The World List of Cycads represents a compilation of currently recognized (valid) names of all known extant cycad taxa. The very first World List was published in 1985 in Encephalartos, the Journal of the Cycad Society of South Africa. There have been a total of 11 published world lists (including the one that is currently in prep), most of which have been included in the proceedings of the International Conferences on Cycad Biology that been held every three years since 1987. Each new list has followed new discoveries and changes in taxonomy and outlook that made previous lists obsolete. The following link represents the most recent published World List of Cycads.

Hill, K.D., D.W. Stevenson & R. Osborne. 2007. The world list of cycads. Proceedings of the 7th International Conference on Cycad Biology (CYCAD 2005), Xalapa, Mexico, January 2005. Memoirs of the New York Botanical Garden 97:454-483.

There is also an online database of cycad taxa based on the World List, called The Cycad Pages, that was developed and is maintained by Ken Hill.

In 2005, on the 20th anniversary of the World List of Cycads, Jody Haynes conducted a historical review of all published world lists and compiled a comprehensive comparison table listing every taxon ever included on a world list and indicating when each name was added and, in some cases, later removed. This document is provided as an online resource that will be updated with the release of each new World List. The most recent update (November 2009) is available for download using the link provided below.

Haynes, J.L. 2009. World List of Cycads: A Historical Review. IUCN/SSC Cycad Specialist Group. Unpublished. 37 pp.

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