Perennial herb. Stems single, erect, quadrangular, 30-50 cm, branched above, glandular-pilose to -villous below, densely glandular above. Leaves simple, ± thin-textured, broadly ovate to ovate-oblong, c. 8-12 x 4.5-8 cm, ± tomentose, cordate to rounded, subentire to erose; petiole 3-11 cm. Inflorescence paniculate; verticillasters 2-6-flowered, distant. Bracts broadly ovate, acuminate, c. 20 x 16 mm. Pedicels c. 3 mm, erecto-patent. Calyx tubular, c.20 mm, greenish-yellow, slightly expanding and hardening in fruit to c. 22 mm, glandular-hirsute; upper lip equally tridentate, spiny in fruit. Corolla white, c. 24 mm; tube straight, c. 17 mm, slightly widening above, glabrous within; upper lip falcate. Stamens B. Nutlets ± spherical, rounded trigonous, c.3 x 2.7 mm. Fl. 5-6. Disturbed steppe, fallow fields, vineyards, 300-900 m.