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In its native Japan, Cycas revoluta is believed to be pollinated by beetles.

Varieties include Euphorbia, Cycas , Haworthia hybrids, Ariocarpus, Mammillaria, and South American cacti such as Copiapoa as well as crested and mutant forms of cactus and succulents.

It lived in a warm and wet environment with a large array of plants, dominated by conifers but also featuring relatives of the Gingko, cycas and others.

With the exception of Cycas, the female flowers are also in the form of cones, bearing numerous carpellary scales.

The long linear leaves of some species of Podocarpus, in which the lamina is traversed by a single vein, recall the pinnae of Cycas; the branches of some Dacrydiums and other forms closely resemble those of lycopods; these superficial resemblances, both between different genera of conifers and between conifers and other plants, coupled with the usual occurrence of fossil coniferous twigs without cones attached to them, render the determination of extinct types a very unsatisfactory and frequently an impossible task.