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Genus Cycas
- type genus of Cycadaceae: genus of widely distributed Old World evergreen tropical trees having pinnate leaves and columnar stems covered with persistent bases of old leaves
Genus Zamia
- genus of small evergreen tropical and subtropical American cycads
Genus Ceratozamia
- small genus of Mexican cycads; sometimes classified in family Cycadaceae
Genus Dioon
- small genus of arborescent cycads of Mexico and Central America; sometimes classified in family Cycadaceae
Genus Encephalartos
- genus of arborescent African cycads; sometimes classified in family Cycadaceae
Genus Macrozamia
- genus of large evergreen Australian cycads; sometimes classified in family Cycadaceae
Genus Bennettitis
- type of the Bennettitales
Genus Lyginopteris
- genus of fossil seed ferns of the Carboniferous
Genus Cordaites
- tall Paleozoic trees superficially resembling modern screw pines; structurally intermediate in some ways between cycads and conifers
Genus Pinus
- type genus of the Pinaceae: large genus of true pines