Which cycad genus has the widest geographic distribution?

The cycad genus with the widest geographic distribution is Cycas. Its range is extensive, extending from eastern Australia westward across the Pacific and Indian oceans to Madagascar and the east coast of South Africa.1

While other cycad genera are often restricted to specific regions—such as the three endemic Australian genera, four American and Caribbean genera, and two African genera—Cycas stands out for its broad, wide-ranging distribution throughout the tropical and subtropical areas of the Old World.12