Photo Ken Hill
The Cycad Pages
Macrozamia riedlei

Macrozamia riedlei (Gaudich.) C.A. Gardner, "Enum. Pl. Austral. Occid., 3" (1930).

Etymology: Honouring Riedle ()

Historical notes:

Distinguishing features: These are smaller plants than the other Western Australian species, with fewer but glossier and flat leaves, and smaller cones. They are also seldom arborescent.

Distribution and habitat: South-western Australia, from Dwellingup to Albany and west to the coast. Widespread and abundant as an understorey plant in jarrah forest.

Conservation status: Not considered to be at risk (IUCN Red List category LR,lc).
Photo Ken Hill
Photo Ken Hill


Plants acaulescent or arborescent (rarely), stem 0-0.3 m tall, 25-40 cm diam.

Leaves 12-30 in crown, bright green to deep green, semiglossy to highly glossy, 121-220 cm long, slightly keeled to flat in section (opposing leaflets inserted at 130-180° on rachis), with 92-150 leaflets; rachis not spirally twisted, straight, stiff; petiole 18-50 cm long, straight, spinescent; basal leaflets reducing to spines.

Leaflets simple, weakly discolorous; margins flat; apex entire, spinescent; median leaflets 230-480 mm long, 7.5-11 mm wide.

Pollen cones fusiform, 29-41 cm long, 11-15 cm diam.; microsporophyll lamina 32-50 mm long, 25-33 mm wide; apical spine 8-75 mm long.

Seed cones ovoid, 25-35 cm long, 14-18 cm diam.; megasporophyll lamina 80 mm long, megasporophyll with an expanded peltate apex 70 mm wide, 23 mm high.

The Cycad Pages

© 1998-2012 Royal Botanic Gardens Sydney
Written and maintained by Ken Hill 1998-2010
Maintained by Leonie Stanberg and Dennis Stevenson 2010-2012
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