1	"Leaflets with a distinct articulation (not coloured swelling) at the base; cone scales in vertical rows"	Zamia
1	"Leaflets not articulated at the base; cone scales in spiral arrangement"	2
2	"Leaflets not or hardly narrowed at the base; seeds on short stalks"	Dioon
2	"Leaflets clearly narrowed at the base; seeds not on stalks"	3
3	"Cone scales with flattened 4 or 6-sided blunt ends; leaflets usually toothed"	Encephalartos
3	"Cone scales pointed or with a terminal spine; leaflets without toothed margins"	4
4	"Leaflets joined to upper edge of midrib, not swollen or coloured at base; cones not or hardly stalked, scales without extended spines"	Lepidozamia
4	"Leaflets attached at midline of the midrib, swollen and coloured at the base; cones stalked, scales with erect spines"	Macrozamia