Montrouziera cauliflora, the giant Houp tree, is a species of flowering plant in the family Clusiaceae.

It is found in moist evergreen dense forest of low and medium altitude (between 200 and 1100 m) on all types of soil.

Damage causes the bark to exude a yellow resin, thick and sticky, with no peculiar smell.

The bark is dark gray or reddish for individuals in very dense forest, with deep vertical cracks.

Houp trees are sacred to New Caledonia's indigenous Kanak people, who traditionally used its wood extensively as a building material.