Calophyllum robustum is a species of flowering plant in the Calophyllaceae family. It is a tree endemic to eastern New Guinea, where it is known from Morobe Province and near Ioma in Northern Province of Papua New Guinea. It is a large tree which grows 18 to 30 metres tall. It is native to lowland rain forest from 3 to 180 metres elevation. It is threatened by habitat loss.
The species was described by Peter F. Stevens in 1974.
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