Cycas cairnsiana is a species of cycad in the genus Cycas, native to northern Australia in northern Queensland on the Newcastle Range.
The stems grow to 2–5 m tall and 12–16 cm diameter, with swollen base. The leaves are dark orange-brown tomentose on emerging, then glaucous blue-green and glabrous with age, 60–110 cm long, bowed, keeled, pinnate, with 180-220 leaflets, the leaflets 8–18 cm long and 2–4 mm wide. The petioles are 18–27 cm long, and armed with sharp spines.
The female cones are open, ...