Macrozamia cardiacensis P.I.Forst. & D.L.Jones

Plants acaulescent, less commonly caulescent; stem 0-0.4 m tall, 20-40 cm diam.; 10-20 leaves in crown. Leaves 150-200 cm long, flat (not keeled) in section, with 100-140 pinnae, dark green, highly glossy; petiole 30-40 cm long, 13-20 mm wide at lowest pinna. Basal pinnae reducing to spines. Median pinnae simple, 23-31 cm long, 9-11 mm wide, strongly discolorous; margins flat; apex entire, spinescent. Pollen cones ±cylindrical, 35-40 cm long, 6.5-8 cm diam.; microsporophyll lamina 22-32 mm long, 10-15 mm wide; apical spine 2-30 mm long. Seed cones narrowly ovoid, 32-36 cm long, 11-14 cm diam.; megasporophyll with an expanded, peltate apex 45 mm wide and 25 mm long; apical spine 7-48 mm long. Seeds oblong, 22-35 mm long, 12-20 mm wide; sarcotesta orange to dark red.

Plants form extensive colonies on precipitous slopes in open forest dominated by Eucalyptus acmenoides and E. major ; very common at the two known localities.