Description from Flora of China
Herbs, perennial. Stems numerous. Leaves sessile, apex apiculate. Inflorescences racemose; flowers 1-4 per stem, pedicellate. Bracteoles 2, linear-lanceolate, herbaceous, margin entire or sometimes 1- or 2-toothed. Calyx tube cylindric, hairy; lobes 5, subulate to linear-lanceolate, subequal, margin 1-3-toothed between lobes. Corolla yellow, outside sparsely pilose, 2-lipped; lower lip 3-lobed, lobes obovate; upper lip erect, 2-lobed. Stamens 4, didynamous; filaments inserted near base of corolla tube; anthers scarcely exserted, dorsifixed, basally mucronulate. Style exserted. Capsule narrowly ovoid, leathery. Seeds flattened or somewhat trigonous, narrowly winged.
Four or five species: China, Russia; two species in China.