Gaudium trinervium is a shrub or small tree that typically grows to a height of and has papery bark that is shed in thin, flaking strips. The leaves are narrow elliptical to broadly egg-shaped with the narrower end towards the base, long and wide, the tip usually blunt and the base tapering to a short
petiole. The flowers are white, about wide and arranged singly or in pairs on the ends of short side shoots. The
floral cup is densely covered with silky hairs, about long tapering to a
pedicel of variable length. The
sepals are also hairy, oblong to triangular, about long, the five petals long and the
stamens long. Flowering mostly occurs from September to October near the coast and from November to December on the tablelands. The fruit is a
capsule wide with the remains of the sepals attached and that falls the plant at maturity. ==Taxonomy==