Very large trees. They can be 70 m high and 200 cm across the trunk. The bark is reddish-brown and scaly. It becomes thick and deeply cracked into flat, flaky ridges with age. The trunk usually does not have branches for most of its length. The leaves are flattened above and have a keel below. They are triangular in cross section. They are 3-5 cm long and shiny pale green. There are 15-30 leaves per tuft. The seed cones are 3-5 cm long and reddish-brown. They are hairy on the lower side. There are about 30 scales. The tips curve towards the base of the cone when open. The bract tip extends beyond the scale. Seed are 5 mm long. The wing is 8 mm long.