Key to Cycad Genera
1 | Leaves
bipinnate Leaves pinnate |
Bowenia Go to 2 |
2 | Leaflets
with a prominent midrib Leaflets lacking a prominent midrib |
Go to 3 Go to 5 |
3 | Leaflet
margins entire, lateral veins absent Leaflet margins irregular or toothed, lateral veins present |
Cycas Go to 4 |
4 | Lateral
veins arising at right angle to midrib Lateral veins arising at acute angle to midrib |
Stangeria Chigua |
5 | Leaflets
attached to upper surface of rhachis Leaflets attached to margins of rhachis |
Lepidozamia Go to 6 |
6 | Swollen,
often colorful small patch of callous tissue at base of upper leaflet margin Colorful callous tissue absent from the base of upper leaflet margin |
Macrozamia Go to 7 |
7 | Leaflets
not jointed to rhachis, cataphylls present on cone stalk Leaflets jointed to rhachis, cataphylls absent on cone stalk |
Go to 8 Go to 9 |
8 | Sporophyll
ends faceted, seeds attached directly to sporophyll, leaflets weakly decurrent on rhachis Sporophyll ends not faceted, seeds attached to sporophylls by a basal stalk, leaflets strongly decurrent on rhachis |
Encephalartos Dioon |
9 | Leaflets
reflexed, prickles absent on petiole and rhachis Leaflets spreading, prickles present or absent on petiole and rhachis |
Microcycas Go to 10 |
10 | Sporophylls with two horns, leaflets entire Sporophylls lacking horns, leaflets with teeth or entire |
Ceratozamia Zamia |
Note: All keys in this chapter that are housed on this site are
adapted from Jones, D.
L.
1993. Cycads of the World. Smithsonian Institution Press, Washington, D.C.
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