The flowers are white, about 7–15 mm (0.28–0.59 in) wide and arranged singly or in pairs on the ends of short side shoots.

The floral cup is densely covered with silky hairs, about 3 mm (0.12 in) long tapering to a pedicel of variable length.

The fruit is a capsule 3–6 mm (0.12–0.24 in) wide with the remains of the sepals attached and that falls the plant at maturity.

[2][3][4] This tea-tree was first described in 1790 by John White who gave it the name Melaleuca trinervia and published the description in his Journal of a Voyage to New South Wales.

[5][6] In 2023, Peter Gordon Wilson transferred the species to the genus Gaudium as G. trinervium in the journal Taxon.