It is a perennial herb, laxly cespitose and pluricaule. The leaves are opposite and petiolate, hasted or truncate at the base. The inflorescences are bracteate whorls formed by 6 flowers. The calyx is bilabiate, with a tridentate upper lip and a lower lip with two long teeth. The corolla is large (2.5-3 cm) and bilabiate, with a helmet-shaped upper lip. The fruit is a tetraquenium.