Perennial, 30-60 cm. Stems with rather long spreading eglandular hairs and oil globules. Leaves ovate-oblong to elliptic, 2-4x 1-2 cm, crenulate or serrulate, acute, cuneate, sparsely pilose, gland-dotted on both surfaces; petiole 1-2 cm. Verticillasters 8-10, separated, 3-6-flowered. Bracts 2 mm. Pedicels 2-3 mm, spreading in fruit, ± tercte. Calyx 1.5-2 mm in flower, c.4-4.5 mm in fruit; upper lip suborbicular, apiculate; lower lip longer than upper; lowermost pair of teeth long subulate, curved upwards. Corolla purplish or white, c. 4 mm. Nutlets c. 1.3 x 0.9 mm, pale brown, broadly ovoid-elliptic, mucilaginous on wetting.