Key to Macrozamia Species
| 1 | Rhachis
with a gentle spiral twist, less than 180° Rhachis with at least one spiral twist of 360° |
Go to 2 Go to 23 |
| 2 | Leaves
held more or less horizontal; rhachis suddenly curved near the base; leaflets more or less erect Leaves erect to obliquely erect; rhachis straight or gently curved |
Go to 3 Go to 4 |
| 3 | Leaflets
to 40 cm X 2 cm, concave, not crowded Leaflets to 20 cm X 0.8 cm, flat, crowded |
M.
platyrachis M. secunda |
| 4 | Proximal
pinnae reduced and spine-like Proximal pinnae slightly shorter than median pinnae but not reduced and spine-like |
Go to 5 Go to 11 |
| 5 | Reduced,
spine-like pinnae extending nearly to base of leaf Reduced, spine-like pinnae stopping well short of leaf base |
Go to 6 Go to 7 |
| 6 | Leaflets
green Leaflets blue-green |
M. johnsonii M. moorei |
| 7 | Leaflets
markedly glaucous Leaflets green |
Go to 8 Go to 9 |
| 8 | Spine-like
appendages on sporophylls to 6 cm long; seeds to 5 cm X 3.5 cm Spine-like appendages on sporophylls to 2 cm long; seeds to 8 cm X 5.5 cm |
M. riedlei M. macdonnellii |
| 9 | Stomata
on both leaflet surfaces Stomata on lower leaflet surface only |
M. riedlei Go to 10 |
| 10 | Leaflets
shiny, thin-textured Leaflets dull, thick-textured |
M.
miquellii M. communis |
| 11 | Stomata
on lower leaflet surface only Stomata on both leaflet surfaces |
Go
to 12 Go to 14 |
| 12 | Median
leaflets attached to rhachis ~90° Median leaflets attached to rhachis ~40° |
M. lucida Go to 13 |
| 13 | Leaflets
~1 cm wide, dark green Leaflets ~0.5 cm wide, light green |
M.
douglasii M. mountperriensis |
| 14 | At
least some leaflets forked All leaflets entire |
Go to 15 Go to 16 |
| 15 | Leaflets
steel-blue, 2-4 mm wide Leaflets green to yellow-green, 5-10 mm wide |
M. stenomera M. diplomera |
| 16 | Trunk
less than 0.5 m tall Trunk to more than 1 m tall |
M. riedlei Go to 17 |
| 17 | Leaves
erect to obliquely erect, forming a crown shaped like a shuttlecock Leaves spreading in a rounded crown |
M. dyeri M. species 'Eneabba' |
| 18 | All
leaflets entire At least some leaflets forked |
Go to 19 Go to 21 |
| 19 | Leaflets
with a single point Leaflets with 3 or more spine-like teeth |
M.
platyrachis Go to 20 |
| 20 | Leaflets
held stiffly erect Leaflets recurved or lax, widely spreading |
M.
lomandroides M. fawcettii |
| 21 | Leaflets
strongly glaucous, at least when young Leaflets dull green |
M.
species 'Northern Pillaga' Go to 22 |
| 22 | Most
leaflets forked Few leaflets forked, sometimes all entire |
M.
heteromera M. species 'Southern Pillaga' |
| 23 | Leaflets
forked, steel-blue All leaflets entire |
M. stenomera Go to 24 |
| 24 | Leaflets
2-4 mm wide Leaflets 6 mm or more wide |
M. pauli-guilielmi Go to 25 |
| 25 | Leaves
held more or less horizontally; leaflets erect Leaves erect to obliquely erect; leaflets spreading |
M.
platyrachis Go to 26 |
| 26 | Leaflets
flat in cross-section Leaflets concave in cross-section |
M.
spiralis Go to 27 |
| 27 | Leaflets
dull green to glaucous; cones glaucous Leaflets dark green and shiny; cones green |
M.
plurinervia Go to 28 |
| 28 | Leaflets to 28 cm X 0.7 cm Leaflets to 60 cm X 1.1 cm |
M. flexuosa M. fearnsidei |
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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