Key to Dioon Species
| 1 | Leaflets
falcate (at least the proximal ones) Leaflets straight |
D. tomasellii Go to 2 |
| 2 | Leaflets
less than 15 mm wide Leaflets more than 15 mm wide |
Go to 3 Go to 8 |
| 3 | Leaflets
with entire margins Leaflet margins bearing spines |
Dioon edule Go to 4 |
| 4 | Leaflets
at right angles, or nearly so, to the rhachis Leaflets at 45º angle or less to the rhachis |
Go to 5 Go to 6 |
| 5 | Leaflets
10-12 mm wide, overlapping Leaflets 7-9 mm wide, not overlapping |
D. merolae D. homlgrenii |
| 6 | Leaflets
less than 5 mm wide Leaflets more than 5 mm wide |
D. caputoi Go to 7 |
| 7 | Leaflets
7-8 mm wide, obliquely erect (vee-ed in cross section) Leaflets 8-10 mm wide, planar (flat in cross section) |
D. califanoi D. purpusii |
| 8 | Petiole
lacking spines Petiole spiny |
D. rzedowskii Go to 9 |
| 9 | Leaflet margins entire Leaflet margins spiny |
D. mejiae D. spinulosum |
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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