Glabrous shrubs to small trees. Leaves decussate, shortly petiolate. Inflorescence axillary, usually single-flowered. Flowers white to pink, pedicellate; bracteoles occasionally persistent; calyx 5-lobed, persistent in fruit; petals 5, free, orbicular; stamens 3–60, united into 5 bundles opposite sepals in 1 or more series, sometimes with a single stamen opposite petals, or stamens free, filaments usually unequal, anthers gland-tipped, basifixed, opening by parallel slits; ovary half-inferior, usually 3-celled. Fruit a loculicidal capsule dehiscent by terminal radial slits; seeds 1–many, oblong to reinform, flat-sided, backs rounded.
22 species endemic to Western Australia, 1 species naturalised in Victoria.
Closely related to Cyathostemon Turcz. (also endemic to Western Australia), which is distinguished by the anthers that are united for most of their length into a persistent tube.