Heath-like shrubs, usually pubescent, rarely glabrous. Leaves alternate, opposite or whorled, simple, glabrous or hairy, sessile or shortly petiolate, sometimes reduced to scales or deciduous. Inflorescences 1-flowered, or sometimes a few together in upper axils; peduncles often dark, elongating as flower matures; bracts minute. Sepals 4 (in Victoria) or 5, dark; petals 4 (in Victoria) or 5, longitudinally folded on each side in bud to enclose 2 stamens; stamens hypogynous, anthers basifixed, dehiscing by an apical usually 2-lipped pore; ovary compressed, ovules 1 or 2 per cell, rarely more. Fruit a compressed capsule, opening longitudinally; seeds finely hairy, with a cream-coloured adaxially coiled appendage.
About 40 species, endemic to temperate regions of Australia. A doubtful specimen of T. ericifolia Sm. from Orbost is believed to be the result of mislabelling of the specimen. This species is from near-coastal areas of central New South Wales and is characterized by its linear leaves and stout, regularly antrorse stem-hairs.