Prostanthera

Shrubs or undershrubs, rarely trees. Leaves opposite, rarely in whorls of 3. Flowers appearing axillary, subtended by leaves or leaf-like bracts, or in racemose or paniculate inflorescences subtended by reduced bracts; bracteoles 2. Calyx 2-lipped; corolla 2-lipped, tube usually expanded in throat; abaxial lip consisting of a median lobe which is usually spreading, emarginate or 2-lobed, and 2 lateral lobes; adaxial lip consisting of a median lobe-pair which is erect, emarginate or 2-lobed; stamens 4, anthers 2-locular, with connective often elongated into an appendage; ovary 4-lobed, style terminal, but inserted between ovary-lobes, stigma 2-fid.