Description from Flora of China
Herbs, perennial, erect. Stems 1 or fascicled, much branched. Leaves few and small, opposite or alternate, sessile. Racemes terminal. Flowers few, solitary from bract axils. Calyx campanulate, persistent, 5-lobed. Corolla 2-lipped; tube tubular, longer than lips; lower lip longer and broader than upper lip, with 2 bulging plaits, 3-lobed, middle lobe smaller than others; upper lip short, erect, emarginate. Stamens 4, didynamous, inserted above middle of corolla tube, glabrous, included; anther locules distinct, divergent. Ovary 2-loculed. Style straight; stigma capitate, 2-lobed. Capsule subglobose. Seeds numerous.
One species: China, Kazakhstan, Kyrgyzstan, Mongolia, Russia, Tajikistan, Turkmenistan, Uzbekistan.