Perennial herbs; branchlets 4-angled, hairs simple. Leaves opposite, petiolate, entire, margins crenate or serrate. Inflorescence with dense, many-flowered cymes forming pseudowhorls in axils of leaves or leaf-like bracts, with uppermost pseudowhorl terminal; internodes of inflorescence apparent. Calyx 2-lipped, 13-veined; abaxial lip 2-toothed, adaxial lip 3-toothed, shorter than abaxial lip; corolla 2-lipped, tube curved and dilated above the middle, abaxial lip 3-lobed, mid-lobe longer than lateral lobes, adaxial lip short, emarginate or entire; stamens 4, fertile, inserted in throat of corolla, anthers with locules strongly divergent, both fertile, not exserted; ovary deeply 4-lobed, style gynobasic, stigma terminal, 2-fid. Mericarps oblong-ovoid, not or hardly keeled.
4 species, from temperate parts of Europe and western Asia; 1 species naturalised in Australia.