Glandular-hairy herb with erect, usually simple stems to c. 30 cm tall. Lvs 5-15 × 3-8 mm, ovate or lanceolate, deeply toothed or lobed; margins somewhat revolute. Infl. = or > non-flowering part when fully developed. Bracts mostly reduced. Calyx c. 10 mm long, glandular-hairy, mainly on nerves; teeth c. 4 mm long, triangular, with margin and apex purple. Corolla 12-15 mm long (to apex of upper lip), persistent around capsule; lobes and upper tube crimson-purple, with crimson-purple hairs (at least in upper part); upper lip 4-5 mm long, white-hairy inside; lower lip lobes united in lower part and with 2, large, elliptic, glandular concavities; middle lobe 1-1.5 mm long. Filaments glabrous except at base. Capsule 7-8 mm long, lanceolate-oblong, glabrous. Seeds c. 0.25 mm long, fusiform.