Agathis australis, commonly known by its Māori name kauri, is the largest (by volume) but not tallest species of tree in New Zealand, standing up to 50m tall in the emergent layer above the forest’s main canopy. The tree has smooth bark and small narrow leaves.
The young plant grows straight upwards and has the form of a narrow cone with branches going out along the length of the trunk. However, as it gains in height, the lowest branches are shed, preventing vines from climbing. By maturity, the top branches form an imposing crown that stands out over all other native trees, dominating the forest canopy.
Agathis australis can attain heights of 40-50m and trunk diameters at over 5m.