Herbs, perennial, terrestrial, rhizomatous. Stems erect, simple. Leaves few, along stem, opposite, slightly unequal in a pair; leaf blade adaxially sparsely pubescent, abaxially sparsely puberulent, base broadly cuneate to rounded. Inflorescences dense, terminal, few-flowered cymes; bracts apparently absent. Calyx slightly zygomorphic, 5-lobed, plicate between adjoining lobes; lobes subequal. Corolla white, zygomorphic, inside glabrous; tube campanulate, saccate at base, slightly longer than limb, ca. 5 mm in diam.; limb 2-lipped; adaxial lip 2-lobed, ca. 1/2 length of abaxial lip; abaxial lip 3-lobed, central lobe longer, apex rounded. Stamens 4, adnate to corolla tube near base, included; anthers basifixed, free, thecae slightly divergent, not confluent, dehiscing longitudinally; connective projecting apically; staminode 1, adnate to adaxial side of corolla tube. Disc ringlike. Ovary depressed globose, 1-loculed; placentas 2, parietal, projecting together from 1 place on ovary wall into locule. Stigma 1, terminal, depressed-globose, undivided. Fruit and seeds unknown.

* One species: endemic to China.