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).
Description:
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.
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