Data source info
divisio Cycadophyta Bessey
Earle J. C. (ed.): Gymnosperm Database (www.conifers.org)
[Data retrieved on: January 2007]
[Data retrieved on: January 2007]
Haynes, J. L. (2006): Historical Review of the World List of Cycads, Unpublished. 37 pp.
[Data retrieved on: 31 December 2007]
[Data retrieved on: 31 December 2007]
Hill K. D., Stevenson D. W., Osborne R. (2004): The world list of cycads, Pp. 195-212, In: J.A. Lindström (ed.), Proceedings of the Sixth International Conference on Cycad Biology (CYCAD 2002). Nong Nooch Tropical Garden, Pattaya, Thailand.
[Data retrieved on: 31 December 2007]
[Data retrieved on: 31 December 2007]
Stevenson, D. W. (1992): A Formal Classification of the Extant Cycads. [s.l.], Brittonia Vol. 44, no.2, p. 220-23
[Data retrieved on: 31 December 2007]
[Data retrieved on: 31 December 2007]