The genus Cycas L is divided into four subgenera, all new, and thirty species are described, of which two are new. A new Asian genus, Epicycas de Laub., is recognized for several Cycas species and one undescribed species with a subterranean bulbous stem base. Keys to the subgenera of Cycas and their species, and to the genus Epicycas are given.

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Blumea: Biodiversity, Evolution and Biogeography of Plants

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Naturalis journals & series

de Laubenfels, D., & Adema, F. (1998). A taxonomic revision of the genera Cycas and Epicycas gen. nov. (Cycadaceae). Blumea: Biodiversity, Evolution and Biogeography of Plants, 43(2), 351–400.