Shrubs; branches often triangular or quadrangular. Leaves in whorls of 3–6. Inflorescences raceme-like on leaf branches; part-inflorescences 1-flowered. Calyx 5-lobed; corolla 5-lobed, distinctly 2-lipped, abaxial median lobe directed outwards and forward to recurved, lateral lobes spreading, adaxial median lobe-pair directed outwards; stamens 2, anthers 1-locular; staminodes 2, sterile anther lobes white; ovary 4-lobed, style terminal, stigma shortly 2-fid.
About 25 species, all endemic to Australia (including Lord Howe Island).