Key to Ceratozamia Species
| 1 | Rhachis
spirally twisted Rhachis not spirally twisted |
Go to 2 Go to 3 |
| 2 | Leaves
to 2 m long; leaflets to 50 cm long Leaves to 1 m long; leaflets to 25 cm long |
C. norstogii C. zaragozae |
| 3 | Leaflets
arranged in clusters Leaflets arranged evenly along the rhachis |
C. hildae Go to 4 |
| 4 | Leaflets
widest above the middle Leaflets widest at or below the middle |
Go to 5 Go to 8 |
| 5 | Leaflets
less than 5 cm wide Leaflets more than 5 cm wide |
Go to 6 Go to 7 |
| 6 | Leaflets
to 4 cm wide Leaflets to 3 cm wide |
C. latifolia C. microstrobila |
| 7 | Leaflets
5-8 cm wide, paper, margins flat Leaflets 9-16 cm wide, transluscent, margins wavy |
C. miqueliana C. euryphyllidea |
| 8 | Leaflets
more than 1.5 cm wide, margins flat Leaflets lesss than 1.5 cm wide, margins revolute |
Go to 9 Go to 10 |
| 9 | Leaflets
less than 2.5 cm wide, straight to slightly falcate Leaflets more than 2.5 cm wide, strongly falcate |
C. mexicana C. robusta |
| 10 | Petiole and rhachis smooth or sparsely prickly Petiole and rhachis with numerous stout prickles |
C.
kuesteriana C. matudae |
Note: All keys in this chapter are adapted from Jones, D. L.
1993.
Cycads of the World. Smithsonian Institution Press, Washington, D.C.
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