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This article is about the plant. For the gothic metal band, see Tristania (band).
Tristania neriifolia maleny.jpg
Tristania neriifolia cultivated at Maleny, Queensland
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Eudicots
(unranked): Rosids
Order: Myrtales
Family: Myrtaceae
Genus: Tristania
Binomial name
Tristania neriifolia
(Sieber ex Sims) R.Br.

Tristania is a monotypic genus, native to New South Wales, Australia, closely related to Callistemon. The genus had a number of species, but some have been reclassified as Lophostemon and Tristaniopsis.

The sole species currently in the genus is Tristania neriifolia.

It is a small tree, with dense branching. The leaves are evergreen, opposite, simple, lanceolate, from 5–9 cm long and 1 cm broad. The flowers are produced in dense clusters of 3-15 together; each flower is 1-1.5 cm diameter, with five small yellow petals and numerous conspicuous stamens.

It is commonly known as the water gum.