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Which genera belong to the cycad family Cycadaceae?

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The family Cycadaceae is represented by a single extant genus:

This family is one of three extant families within the order Cycadales, which consists of palmlike gymnospermous plants. While other families such as Stangeriaceae and Zamiaceae contain multiple genera, the Cycadaceae is distinguished by its foliar, multiovulate megasporophylls and pinnae that feature a single midrib without lateral, branching veins.1