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Cycads are dioecious plants (i.e. either male or female) divided into two families Cycadaceae and Zamiaceae according to World list of Cycads accessed 10 November 2016, with 10 genera and about 348 species. Cycads are distributed through the warmer regions of Africa, North and South America, Asia, and Australia, as well as on numerous islands also. Bowenia and Stangeria genera of former family Stangeriaceae is placed under Zamiaceae family.

Cycad group is one of the most threatened group of Kingdom Plantae, with two species Encephalartos relictus (Swaziland) and E. woodii (South Africa) extinct in the wild.

Cycadaceae family

It consists only of one genus Cycas which is distributed in Asia, North Australia and only Cycas thouarsii occurs in very few parts of Africa.

Cycas genus

Cycas genus consists of 114 species.

Zamiaceae family

Zamiaceae family consists of 9 genera, Encephalartos and Stangeria occurs in Africa, Bowenia, Macrozamia and Lepidozamia in Australia, and Ceratozamia, Dioon, Microcycas, and Zamia in North, Central and South America.

Bowenia genus

Bowenia genus consists of only 2 species and occurs only in Australia.

Ceratozamia genus

Ceratozamia genus consists of 30 species.

Dioon genus

Dioon genus consists of 15 species.

Encephalartos genus

Encephalartos genus consists of 65 species.

Lepidozamia genus

Lepidozamia genus consists of only 2 species.

Macrozamia genus

Macrozamia genus consists of 41 species.

Microcycas genus

Microcycas genus consists of only one species.

Stangeria genus

Stangeria genus consists of only one species and occurs only in Africa.

Zamia genus

Zamia genus consists of 77 species.

citation : Calonje M, Stevenson DW, Stanberg L. The World List of Cycads, online edition [Internet]. 2013-2016. [cited 2016 Nov 10]. Available from: