1	"Leaves bipinnate; seeds radiospermic; cataphylls absent"	"Stangeriaceae {Bowenia}"
1	"Leaves simply pinnate; pinnae sometimes dichotomously divided; seeds platyspermic or radiospermic; cataphylls present"	2
2	"Pinnae with a thick midrib and no lateral veins; female sporophylls spirally arranged in a terminal rosette, with the central axis continuing vegetative growth; seeds platyspermic"	"Cycadaceaece {Cycas}"
2	"Pinnae without a midrib but with several subparallel longitudinal veins; female sporophylls spirally arranged in a determinate axillary cone; seeds radiospermic"	Zamiaceae