- hau tree.
- a tropical American tree, Hibiscus elatus, of the mallow family, having wood used for cabinetwork and gunstocks.
- a tree, Melicytus ramiflora, of the violet family, native to New Zealand and other Pacific islands, having greenish flowers and blue berries.
- a small New Zealand tree, Melicytus ramiflorus, with white flowers and bark
