Description from Flora of China
Subshrubs, terrestrial, not rhizomatous. Stems simple. Leaves few, along stem, opposite, equal to subequal in a pair; leaf blade glabrous to sparsely pubescent, base attenuate to broadly cuneate. Inflorescences dense, axillary, 3-7-flowered cymes; bracts 2, opposite, adjoining, forming a globose involucre. Calyx actinomorphic, 5-sect from base; segments equal. Corolla purplish to white, zygomorphic, inside glabrous; tube funnelform-tubular, not swollen, much longer than limb, ca. 1.3 cm in diam.; limb 2-lipped; adaxial lip 2-lobed, much shorter than abaxial lip; abaxial lip 3-lobed, lobes equal, apex rounded. Stamens 2, adnate to corolla tube below middle of abaxial side, included; anthers dorsifixed, coherent by adaxial surfaces, thecae divaricate, confluent, dehiscing longitudinally; connectives 1-appendiculate abaxially; staminodes 2, adnate to adaxial side of corolla tube. Disc ringlike. Ovary linear, 2-loculed; placentas 2, axile. Stigmas 2, unequal, smaller 1 semiorbicular, undivided, larger 1 broadly flabellate, emarginate. Immature capsule straight in relation to pedicel, linear, much longer than calyx; valves probably 2, straight, not twisted. Seeds unappendaged.
One species: China, Laos.