Perennial, aromatic, green, with a very long creeping woody rootstock. Stamens ascending or erect, 10-25 x 10-25 cm, usually not branched, purplish below, very finely glandular-pilose, leafy above. Leaves sessile, ovate to very broadly orbicular-ovate, 10-25 mm, usually increasing in size from below upwards, on both surfaces with a ± dense indumentum of capitate glandular hairs, irregularly crenate-serrate, cordate or rounded at base. Flowers almost hidden in axils of upper leaves, 4-6, shortly pedunculate, resupinate or not. Bracts 3.5-5 mm, linear-acuminate. Pedicels 0.5-1 mm. Calyx violet blue or green, curved, 10-11 mm, split to c. 1/3, glandular pilose; lower teeth c. 2.5 mm, acuminate; teeth erect-spreading after anthesis; tube thickly bearded within. Corolla mauve or pale purple, c. 15 mm; tube very slender at base widening to c. 3 mm in diameter at throat; lower lip longer than upper, with a bearded median lobe.